CVE-2026-89422

Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.

• https://cna.erlef.org/cves/CVE-2026-89422.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://github.com/erlang/otp/commit/21b8a1b0ad0adf200682b3854bc50114ab2b8c62 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://github.com/erlang/otp/commit/98c66c858113949c4262d26cd7d426c4b09d2b35 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://github.com/erlang/otp/commit/afec5156361bb50d3607c7c1a453c19b9149b324 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://github.com/erlang/otp/commit/fd1d9d07fc92ec0d59f96dfb66182195882bb7dd 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://github.com/erlang/otp/security/advisories/GHSA-rgxr-4g4w-j875 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://osv.dev/vulnerability/EEF-CVE-2026-89422 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
• https://www.erlang.org/doc/system/versions.html#order-of-versions 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

The full cvelistV5 record. Download as CVE-2026-89422.json.

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-89422",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-22T13:08:04.474621Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-22T13:08:15.912Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "tls_client_connection_1_3",
            "tls_gen_connection_1_3",
            "tls_handshake_1_3"
          ],
          "packageName": "otp",
          "packageURL": "pkg:software-id/erlang.org/otp",
          "product": "OTP",
          "programFiles": [
            "lib/ssl/src/tls_client_connection_1_3.erl",
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            "lib/ssl/src/tls_handshake_1_3.erl"
          ],
          "programRoutines": [
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              "name": "tls_client_connection_1_3:handle_encrypted_extensions/2"
            },
            {
              "name": "tls_client_connection_1_3:maybe_resumption/1"
            },
            {
              "name": "tls_gen_connection_1_3:handle_resumption/2"
            },
            {
              "name": "tls_handshake_1_3:get_pre_shared_key/4"
            }
          ],
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "27.3.4.18",
                  "status": "unaffected"
                },
                {
                  "at": "28.5.0.7",
                  "status": "unaffected"
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                  "status": "unaffected"
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            "tls_gen_connection_1_3",
            "tls_handshake_1_3"
          ],
          "packageName": "ssl",
          "packageURL": "pkg:otp/ssl?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp&vcs_url=git%2Bhttps:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
          "product": "OTP",
          "programFiles": [
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              "name": "tls_client_connection_1_3:handle_server_hello/2"
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            },
            {
              "name": "tls_client_connection_1_3:maybe_resumption/1"
            },
            {
              "name": "tls_gen_connection_1_3:handle_resumption/2"
            },
            {
              "name": "tls_handshake_1_3:get_pre_shared_key/4"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "11.2.12.13",
                  "status": "unaffected"
                },
                {
                  "at": "11.6.0.6",
                  "status": "unaffected"
                },
                {
                  "at": "11.7.7",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "9.5",
              "versionType": "otp"
            }
          ]
        },
        {
          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
          ],
          "defaultStatus": "unaffected",
          "modules": [
            "tls_client_connection_1_3",
            "tls_gen_connection_1_3",
            "tls_handshake_1_3"
          ],
          "packageName": "erlang/otp",
          "packageURL": "pkg:github/erlang/otp",
          "product": "OTP",
          "programFiles": [
            "lib/ssl/src/tls_client_connection_1_3.erl",
            "lib/ssl/src/tls_gen_connection_1_3.erl",
            "lib/ssl/src/tls_handshake_1_3.erl"
          ],
          "programRoutines": [
            {
              "name": "tls_client_connection_1_3:handle_server_hello/2"
            },
            {
              "name": "tls_client_connection_1_3:handle_encrypted_extensions/2"
            },
            {
              "name": "tls_client_connection_1_3:maybe_resumption/1"
            },
            {
              "name": "tls_gen_connection_1_3:handle_resumption/2"
            },
            {
              "name": "tls_handshake_1_3:get_pre_shared_key/4"
            }
          ],
          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
                {
                  "at": "afec5156361bb50d3607c7c1a453c19b9149b324",
                  "status": "unaffected"
                },
                {
                  "at": "98c66c858113949c4262d26cd7d426c4b09d2b35",
                  "status": "unaffected"
                },
                {
                  "at": "fd1d9d07fc92ec0d59f96dfb66182195882bb7dd",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "21b8a1b0ad0adf200682b3854bc50114ab2b8c62",
              "versionType": "git"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "27.3.4.18",
                  "versionStartIncluding": "22.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "28.5.0.7",
                  "versionStartIncluding": "28.0",
                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "29.1.1",
                  "versionStartIncluding": "29.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ],
          "operator": "AND"
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Milad Nasr / Anthropic"
        },
        {
          "lang": "en",
          "type": "finder",
          "value": "Luna Tong / Anthropic"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Ingela Andin"
        }
      ],
      "dateAssigned": "2026-09-16T10:27:13.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "<p>Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A <code>pre_shared_key</code> extension in the <code>ServerHello</code> that the client never offered causes the client to complete the handshake without validating the server's certificate, so <code>ssl:connect</code> returns <code>{ok, Socket}</code> against a peer holding no certificate, no private key and no prior session.</p>\n<p><code>tls_client_connection_1_3:handle_server_hello/2</code> passes the received extension to <code>tls_gen_connection_1_3:handle_resumption/2</code>, which sets <code>resumption = true</code> on its mere presence without checking that the client offered a PSK. <code>tls_handshake_1_3:get_pre_shared_key/4</code> meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes <code>maybe_resumption/1</code> straight to <code>wait_finished</code>, skipping the certificate-handling states, so certificate path validation, <code>verify_fun</code>, hostname verification, <code>partial_chain</code>, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.</p>\n<p>This issue affects OTP from OTP&nbsp;22.2 before OTP&nbsp;27.3.4.18, OTP&nbsp;28.5.0.7, and OTP&nbsp;29.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7.</p>"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A `pre_shared_key` extension in the `ServerHello` that the client never offered causes the client to complete the handshake without validating the server's certificate, so `ssl:connect` returns `{ok, Socket}` against a peer holding no certificate, no private key and no prior session.\n\n`tls_client_connection_1_3:handle_server_hello/2` passes the received extension to `tls_gen_connection_1_3:handle_resumption/2`, which sets `resumption = true` on its mere presence without checking that the client offered a PSK. `tls_handshake_1_3:get_pre_shared_key/4` meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes `maybe_resumption/1` straight to `wait_finished`, skipping the certificate-handling states, so certificate path validation, `verify_fun`, hostname verification, `partial_chain`, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7."
            }
          ],
          "value": "Key Exchange without Entity Authentication vulnerability in Erlang/OTP ssl allows a peer that answers a TLS 1.3 client connection to impersonate the intended server. A pre_shared_key extension in the ServerHello that the client never offered causes the client to complete the handshake without validating the server's certificate, so ssl:connect returns {ok, Socket} against a peer holding no certificate, no private key and no prior session.\n\ntls_client_connection_1_3:handle_server_hello/2 passes the received extension to tls_gen_connection_1_3:handle_resumption/2, which sets resumption = true on its mere presence without checking that the client offered a PSK. tls_handshake_1_3:get_pre_shared_key/4 meanwhile falls back to the all-zero \"no PSK\" value and keys the handshake with the ordinary non-PSK schedule, so the attacker's own ephemeral key suffices. The resumption flag then routes maybe_resumption/1 straight to wait_finished, skipping the certificate-handling states, so certificate path validation, verify_fun, hostname verification, partial_chain, CRL checking and OCSP stapling are all bypassed. The default client configuration is affected; clients restricted to TLS 1.2 are not.\n\nThis issue affects OTP from OTP\u00a022.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssl from 9.5 before 11.2.12.13, 11.6.0.6, and 11.7.7."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-94",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "<p>An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of <code>ssl:connect</code> that negotiates TLS 1.3 is affected, including <code>httpc</code> over HTTPS, database and messaging client libraries, and TLS distribution clients.</p>"
                },
                {
                  "base64": false,
                  "type": "text/markdown",
                  "value": "An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of `ssl:connect` that negotiates TLS 1.3 is affected, including `httpc` over HTTPS, database and messaging client libraries, and TLS distribution clients."
                }
              ],
              "value": "An attacker that answers a TLS 1.3 client connection, either as the host the client dials or as an on-path attacker, completes the handshake as the intended server and holds all traffic keys. It can read everything the application sends, including credentials, tokens and request bodies, and forge every response. Any consumer of ssl:connect that negotiates TLS 1.3 is affected, including httpc over HTTPS, database and messaging client libraries, and TLS distribution clients."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 9.3,
            "baseSeverity": "CRITICAL",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-322",
              "description": "CWE-322 Key Exchange without Entity Authentication",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-22T08:49:16.171Z",
        "orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
        "shortName": "EEF"
      },
      "references": [
        {
          "name": "GitHub Advisory",
          "tags": [
            "related",
            "vendor-advisory"
          ],
          "url": "https://github.com/erlang/otp/security/advisories/GHSA-rgxr-4g4w-j875"
        },
        {
          "name": "EEF CNA record for CVE-2026-89422",
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-89422.html"
        },
        {
          "name": "OSV record EEF-CVE-2026-89422",
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-89422"
        },
        {
          "name": "Erlang/OTP version ordering",
          "tags": [
            "x_version-scheme"
          ],
          "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
        },
        {
          "name": "Introducing commit 21b8a1b in erlang/otp",
          "tags": [
            "related"
          ],
          "url": "https://github.com/erlang/otp/commit/21b8a1b0ad0adf200682b3854bc50114ab2b8c62"
        },
        {
          "name": "Fix commit afec515 in erlang/otp",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/afec5156361bb50d3607c7c1a453c19b9149b324"
        },
        {
          "name": "Fix commit 98c66c8 in erlang/otp",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/98c66c858113949c4262d26cd7d426c4b09d2b35"
        },
        {
          "name": "Fix commit fd1d9d0 in erlang/otp",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/fd1d9d07fc92ec0d59f96dfb66182195882bb7dd"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "TLS 1.3 client skips server authentication when ServerHello carries an unsolicited pre_shared_key extension",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "<p>Restrict affected clients to TLS 1.2 by setting <code>{versions, ['tlsv1.2']}</code> in the client's <code>ssl</code> options. This avoids the vulnerable code path at the cost of losing TLS 1.3.</p>\n<p>No configuration both keeps TLS 1.3 and mitigates the issue.</p>"
            },
            {
              "base64": false,
              "type": "text/markdown",
              "value": "Restrict affected clients to TLS 1.2 by setting `{versions, ['tlsv1.2']}` in the client's `ssl` options. This avoids the vulnerable code path at the cost of losing TLS 1.3.\n\nNo configuration both keeps TLS 1.3 and mitigates the issue."
            }
          ],
          "value": "Restrict affected clients to TLS 1.2 by setting {versions, ['tlsv1.2']} in the client's ssl options. This avoids the vulnerable code path at the cost of losing TLS 1.3.\n\nNo configuration both keeps TLS 1.3 and mitigates the issue."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-89422",
    "datePublished": "2026-09-22T08:49:16.171Z",
    "dateReserved": "2026-09-11T18:45:01.480Z",
    "dateUpdated": "2026-09-22T13:08:15.912Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}