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CVE-2026-61695

📛 CVE Title

Wire Swift runtime: negative LENGTH_DELIMITED length in skipGroup() crashes any protobuf-decoding service

⬇ Download JSON ⚠ View as Threat

Description

Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.4.1 and 7.0.0-alpha04, Wire's Swift runtime ProtoReader.skipGroup(expectedEndTag:unknownFieldsWriter:) accepts a negative length for a LENGTH_DELIMITED field inside an unknown START_GROUP field. ProtoReader.readData() forwards the negative count to ReadBuffer.readData(count:), whose upper-bound-only check permits the value to reach Foundation Data(bytes:count:) and trigger an unrecoverable process trap instead of a catchable ProtoDecoder.Error. Any Swift process decoding untrusted protobuf bytes can be crashed without authentication, user interaction, or knowledge of the target schema. This issue is fixed in versions 6.4.1 and 7.0.0-alpha04.

Overview

State
PUBLISHED
Assigner (CNA)
GitHub_M
CVSS severity
HIGH
CVSS score
CVSS 7.5 / 10 7.5 7.5 / 10
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Effective score
7.5 / 10 HIGH source: CNA overview
CWE(s)
CWE-129
Reserved
2026-07-10
Published
2026-09-23 18:44 UTC
Last updated
2026-09-23 18:44 UTC
Source
https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/61xxx/CVE-2026-61695.json
Linked Threat
CVE-2026-61695 — Wire Swift runtime: negative LENGTH_DELIMITED length in skipGroup() crashes any protobuf-decoding service

NVD triage scoring NVD CVE 2.0

Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.

NVD published
2026-09-23 19:17:32 UTC
NVD last modified
2026-09-23 19:17:32 UTC
NVD CVSS v3.1
CVSS 7.5 / 10 7.5 7.5 / 10 HIGH source: security-advisories@github.com
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitability subscore
3.9 / 10
Impact subscore
3.6 / 10

NVD / KEV / EPSS data refreshed 2026-09-24 04:38 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.

European Union Vulnerability Database ENISA EUVD

ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.

EUVD ID
EUVD-2026-85559

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Affected products (1)
VendorProductVersionsPlatforms
square wire < 6.4.1 (affected), >= 7.0.0-alpha01, < 7.0.0-alpha04 (affected) —

Vendor references (6)

References embedded in the original CVE record by the assigning CNA.

Web references (0)

DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.

No web references attached yet.

NVD-tagged references (6)

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

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-61695.json.

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "wire",
          "vendor": "square",
          "versions": [
            {
              "status": "affected",
              "version": "< 6.4.1"
            },
            {
              "status": "affected",
              "version": ">= 7.0.0-alpha01, < 7.0.0-alpha04"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "Wire provides gRPC and protocol buffers for Android, Kotlin, Swift, and Java. Prior to 6.4.1 and 7.0.0-alpha04, Wire's Swift runtime ProtoReader.skipGroup(expectedEndTag:unknownFieldsWriter:) accepts a negative length for a LENGTH_DELIMITED field inside an unknown START_GROUP field. ProtoReader.readData() forwards the negative count to ReadBuffer.readData(count:), whose upper-bound-only check permits the value to reach Foundation Data(bytes:count:) and trigger an unrecoverable process trap instead of a catchable ProtoDecoder.Error. Any Swift process decoding untrusted protobuf bytes can be crashed without authentication, user interaction, or knowledge of the target schema. This issue is fixed in versions 6.4.1 and 7.0.0-alpha04."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-129",
              "description": "CWE-129: Improper Validation of Array Index",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-23T18:44:11.336Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/square/wire/security/advisories/GHSA-86wm-r4c5-2rc9"
        },
        {
          "name": "https://github.com/square/wire/pull/3616",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/square/wire/pull/3616"
        },
        {
          "name": "https://github.com/square/wire/commit/24043b6b3a5e5974a978f2745b76d50b31407c1c",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/square/wire/commit/24043b6b3a5e5974a978f2745b76d50b31407c1c"
        },
        {
          "name": "https://github.com/square/wire/commit/81ff7f24a6795d9a8be2e03f272b2d979a5d2c7e",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/square/wire/commit/81ff7f24a6795d9a8be2e03f272b2d979a5d2c7e"
        },
        {
          "name": "https://github.com/square/wire/releases/tag/6.4.1",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/square/wire/releases/tag/6.4.1"
        },
        {
          "name": "https://github.com/square/wire/releases/tag/7.0.0-alpha04",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/square/wire/releases/tag/7.0.0-alpha04"
        }
      ],
      "source": {
        "advisory": "GHSA-86wm-r4c5-2rc9",
        "discovery": "UNKNOWN"
      },
      "title": "Wire Swift runtime: negative LENGTH_DELIMITED length in skipGroup() crashes any protobuf-decoding service"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61695",
    "datePublished": "2026-09-23T18:44:11.336Z",
    "dateReserved": "2026-07-10T18:36:58.850Z",
    "dateUpdated": "2026-09-23T18:44:11.336Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}