CVE-2026-68956

Description

Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler. The "session" clause of ssh_connection:handle_msg/4 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisible to the limit and setting the option to a finite value does not mitigate the attack. RFC 4254 section 5.1 permits many session channels per connection, and each record costs only a few hundred bytes, so a single authenticated connection can accumulate channels until the node runs out of memory and the emulator terminates, affecting every application on it. No file contents, credentials, or write access are obtainable. This issue affects OTP from OTP 18.1.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP 18.1.2, corresponding to ssh before 4.1.1, is affected is unknown.

Overview

State: PUBLISHED
Assigner (CNA): EEF
CVSS severity: HIGH
CVSS score: 7.1 / 10
CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Effective score: 7.1 / 10 HIGH source: CNA overview
CWE(s): CWE-770
Reserved: 2026-08-17
Published: 2026-09-22 08:49 UTC
Last updated: 2026-09-22 10:44 UTC
Source: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/68xxx/CVE-2026-68956.json
Linked Threat: CVE-2026-68956 — SSH daemon allocates unbounded idle session channels, bypassing max_channels

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: 2026-09-22 09:17:05 UTC
NVD last modified: 2026-09-22 19:09:32 UTC
EPSS score: 0.0047 (probability of exploitation in next 30 days)
EPSS percentile: 40.25% vs all CVEs — higher = more likely to be exploited, as of 2026-09-22

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-2026-84339
Assigner: EEF
Published: Sep 22, 2026, 8:49:21 AM
Updated: Sep 22, 2026, 10:44:31 AM
EUVD base score (CVSS 4.0): 7.1 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EUVD-reported EPSS: 0.4800
Vendors: erlang
Products: otp (18.1.2 <*)

otp (84df3d4d0278e21a36a453bfee94799f0df67c2a <*)

otp (4.1.1 <*)

ENISA description: Allocation of Resources Without Limits or Throttling vulnerability in Erlang/OTP ssh allows an authenticated remote attacker to exhaust node memory by repeatedly opening session channels that are never assigned a handler. The "session" clause of ssh_connection:handle_msg/4 checks only minimal_remote_max_packet_size before calling setup_session/5, which unconditionally builds a #channel{} record and stores it in the ETS channel cache. The max_channels daemon option is consulted only by ssh_channel_sup:max_num_channels_not_exceeded/2, which counts supervisor children, so a channel that never gets a shell, exec, or subsystem handler is invisible to the limit and setting the option to a finite value does not mitigate the attack. RFC 4254 section 5.1 permits many session channels per connection, and each record costs only a few hundred bytes, so a single authenticated connection can accumulate channels until the node runs out of memory and the emulator terminates, affecting every application on it. No file contents, credentials, or write access are obtainable. This issue affects OTP from OTP 18.1.2 before OTP 27.3.4.18, OTP 28.5.0.7, and OTP 29.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP 18.1.2, corresponding to ssh before 4.1.1, is affected is unknown.

EUVD references (8)

Microsoft Security Response Center MSRC

Microsoft's vendor-authoritative record from the Security Update Guide — its own CVSS score, impact, severity rating, exploit assessment, and KB-article fixes. Refreshed 2026-09-26 03:08 UTC (source: CVRF).

MS severity: Important
Release: 2026-Sep

Microsoft remediations / KB articles (2)

Release Notes — Vendor Fix / Security Update
https://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade — None Available / Release Notes

Affected products (3)

Vendor	Product	Versions	Platforms
Erlang	OTP	`18.1.2` (affected)	—
Erlang	OTP	`4.1.1` (affected)	—
Erlang	OTP	`84df3d4d0278e21a36a453bfee94799f0df67c2a` (affected)	—

Vendor references (8)

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

GitHub Advisory relatedvendor-advisory
EEF CNA record for CVE-2026-68956 related
OSV record EEF-CVE-2026-68956 related
Erlang/OTP version ordering x_version-scheme
Introducing commit 84df3d4 in erlang/otp related
Fix commit 79c2d2b in erlang/otp patch
Fix commit e181009 in erlang/otp patch
Fix commit e2bbad0 in erlang/otp patch

Web references (2)

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

None Available msrc
MSRC update guide: CVE-2026-68956 msrc

NVD-tagged references (8)

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-2026-68956.html 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://github.com/erlang/otp/commit/79c2d2be17d902c5f53969b5806b725efda831be 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://github.com/erlang/otp/commit/84df3d4d0278e21a36a453bfee94799f0df67c2a 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://github.com/erlang/otp/commit/e18100975f0e5a8d59d02de00df12247a91b443b 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://github.com/erlang/otp/commit/e2bbad0107bba41491a4d549686fd023db8740da 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://github.com/erlang/otp/security/advisories/GHSA-qhcm-px9c-rvfh 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://osv.dev/vulnerability/EEF-CVE-2026-68956 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
https://www.erlang.org/doc/system/versions.html#order-of-versions 6b3ad84c-e1a6-4bf7-a703-f496b71e49db

Remediations (10)

Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.

Microsoft Defender Patch Bypass: High Severity Zero-Day Privilege ...

web:arcticwolf.com

Validate Group Policy and registry settings for Defender to ensure real-time protection, automatic remediation , and exclusion policies are secured. Temporary Workarounds Block Vulnerable Apps: Use Microsoft Defender Vulnerability Management to block or warn against execution of affected binaries for systems pending a patch .

2026-09-23 15:17 UTC
Defender Zero-Day CVE-2026-50656 Under Active Exploit, No Patch

web:dailysecurityreview.com

Microsoft confirmed CVE - 2026 -50656, a zero-day in the Defender Malware Protection Engine allowing SYSTEM-level privilege escalation, is under active exploitation with no patch currently available.

2026-09-23 15:17 UTC
Security Update Guide - Microsoft

web:msrc.microsoft.com

The Microsoft Security Response Center (MSRC) investigates all reports of security vulnerabilities affecting Microsoft products and services, and provides the information here as part of the ongoing effort to help you manage security risks and help keep your systems protected.

2026-09-23 15:17 UTC
Security Update Guide - Microsoft Security Response Center

web:msrc.microsoft.com

Security Update Guide - Microsoft Security Response Center

2026-09-23 15:17 UTC
Cisco Advance Notification for Publication of September 16, 2026 ...

web:sec.cloudapps.cisco.com

On September 16, 2026 , the Cisco Product Security Incident Response Team (PSIRT) published the advisories that are listed in the following tables. To remediate these vulnerabilities, Cisco strongly recommends that customers upgrade to the fixed software that is indicated in the advisories. For more information about changes in Cisco PSIRT vulnerability disclosure, see Strengthening the ...

2026-09-23 15:17 UTC
Microsoft Patch Tracker (September 2026): Exploit-Ranked | Senserva

web:senserva.com

Every Microsoft security patch (KB) and the CVEs it fixes, with severity, CVSS, and CISA KEV status. Cross-linked to the CVE reference.

2026-09-23 15:17 UTC
Description of the security update for Office 2016: August 11, 2026 ...

web:support.microsoft.com

Be aware that the update in the Microsoft Download Center applies to the Microsoft Installer (.msi)-based edition of Office 2016. It doesn't apply to the Office 2016 Click-to-Run editions, such as Microsoft Office 365 Home. (See What version of Office am I using?) How to get and install the update Method 1: Microsoft Update This update is available from Microsoft Update. When you turn on ...

2026-09-23 15:17 UTC
August 2026 CVE Advisory Notification - Security

web:support.servicenow.com

Due to additional analysis provided by the security researcher who discovered CVE - 2026 -6876, we have upgraded the severity rating of CVE - 2026 -6876 from High to Critical. This change affects only the severity

2026-09-23 15:17 UTC
Critical Patches Issued for Microsoft Products, August 11, 2026

web:www.cisecurity.org

<p>Multiple vulnerabilities have been discovered in Microsoft products, the most severe of which could allow for remote code execution. Successful exploitation of the most severe of these vulnerabilities could result in an attacker gaining the same privileges as the logged-on user. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or ...

2026-09-23 15:17 UTC
Oracle Critical Patch Update Advisory - July 2026

web:www.oracle.com

This Critical Patch Update contains 1448 new security patches across the product families listed below. Please note that a My Oracle Support (MOS) note summarizing the content of this Critical Patch Update and other Oracle Software Security Assurance activities is located at July 2026 Critical Patch Update: Executive Summary and Analysis.

2026-09-23 15:17 UTC

AI Forensic Analysis

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Raw JSON

The full cvelistV5 record. Download as CVE-2026-68956.json.

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            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/e2bbad0107bba41491a4d549686fd023db8740da"
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "SSH daemon allocates unbounded idle session channels, bypassing max_channels",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "<p>No option bounds the number of idle session channels, so the following reduce exposure without eliminating the issue.</p>\n<ul>\n<li>Restrict network access to the SSH daemon to trusted clients. Exploitation requires a successfully authenticated session, so limiting who can authenticate is the most effective control available.</li>\n<li>Set the <code>max_sessions</code> daemon option to a finite value to bound the number of concurrent connections. This limits how many connections can mount the attack in parallel, though a single connection still suffices to exhaust memory.</li>\n<li>Apply operating-system or firewall connection-rate and connection-count limits per source address.</li>\n<li>Monitor node memory externally and restart the emulator when it exceeds a threshold.</li>\n</ul>\n<p>Setting <code>max_channels</code> is not a workaround: idle session channels bypass that check entirely.</p>"
            },
            {
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              "type": "text/markdown",
              "value": "No option bounds the number of idle session channels, so the following reduce exposure without eliminating the issue.\n\n* Restrict network access to the SSH daemon to trusted clients. Exploitation requires a successfully authenticated session, so limiting who can authenticate is the most effective control available.\n* Set the `max_sessions` daemon option to a finite value to bound the number of concurrent connections. This limits how many connections can mount the attack in parallel, though a single connection still suffices to exhaust memory.\n* Apply operating-system or firewall connection-rate and connection-count limits per source address.\n* Monitor node memory externally and restart the emulator when it exceeds a threshold.\n\nSetting `max_channels` is not a workaround: idle session channels bypass that check entirely."
            }
          ],
          "value": "No option bounds the number of idle session channels, so the following reduce exposure without eliminating the issue.\n\n* Restrict network access to the SSH daemon to trusted clients. Exploitation requires a successfully authenticated session, so limiting who can authenticate is the most effective control available.\n* Set the max_sessions daemon option to a finite value to bound the number of concurrent connections. This limits how many connections can mount the attack in parallel, though a single connection still suffices to exhaust memory.\n* Apply operating-system or firewall connection-rate and connection-count limits per source address.\n* Monitor node memory externally and restart the emulator when it exceeds a threshold.\n\nSetting max_channels is not a workaround: idle session channels bypass that check entirely."
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
    "assignerShortName": "EEF",
    "cveId": "CVE-2026-68956",
    "datePublished": "2026-09-22T08:49:21.760Z",
    "dateReserved": "2026-08-17T13:30:02.155Z",
    "dateUpdated": "2026-09-22T10:44:31.598Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}