Vulnerability-Lookup

UBUNTU-CVE-2026-68956 (CVE-2026-68956)

Vulnerability from osv_ubuntu – Published: 2026-09-22 09:17 – Updated: 2026-09-28 02:57 – Source website

Details

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.

Severity

7.1 (High)


                    
                      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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-68956	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-68956	REPORT
	https://cna.erlef.org/cves/CVE-2026-68956.html	REPORT
	https://github.com/erlang/otp/commit/79c2d2be17d9…	REPORT
	https://github.com/erlang/otp/commit/84df3d4d0278…	REPORT
	https://github.com/erlang/otp/commit/e18100975f0e…	REPORT
	https://github.com/erlang/otp/commit/e2bbad0107bb…	REPORT
	https://github.com/erlang/otp/security/advisories…	REPORT
	https://osv.dev/vulnerability/EEF-CVE-2026-68956	REPORT
	https://www.erlang.org/doc/system/versions.html#o…	REPORT

JSON

To clipboard

{
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  "details": "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\u00a018.1.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP\u00a018.1.2, corresponding to ssh before 4.1.1, is affected is unknown.",
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CVE-2026-68956 (GCVE-0-2026-68956)

Vulnerability from cvelistv5 – Published: 2026-09-22 08:49 – Updated: 2026-09-24 20:07

Title

SSH daemon allocates unbounded idle session channels, bypassing max_channels

Summary

Severity

7.1 (High)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-22 10:12 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

EEF mitre root

References

8 references

URL	Tags
https://github.com/erlang/otp/security/advisories…	relatedvendor-advisory
https://cna.erlef.org/cves/CVE-2026-68956.html	related
https://osv.dev/vulnerability/EEF-CVE-2026-68956	related
https://www.erlang.org/doc/system/versions.html#o…	x_version-scheme
https://github.com/erlang/otp/commit/84df3d4d0278…	related
https://github.com/erlang/otp/commit/79c2d2be17d9…	patch
https://github.com/erlang/otp/commit/e18100975f0e…	patch
https://github.com/erlang/otp/commit/e2bbad0107bb…	patch

Impacted products

3 products

Vendor	Product	Version
Erlang	OTP	Affected: 18.1.2 , < * (otp) cpe:2.3:a:erlang:erlang\/otp::::::::
Erlang	OTP	Affected: 4.1.1 , < * (otp) cpe:2.3:a:erlang:erlang\/otp::::::::
Erlang	OTP	Affected: 84df3d4d0278e21a36a453bfee94799f0df67c2a , < * (git) Unaffected: 79c2d2be17d902c5f53969b5806b725efda831be , < * (git) Unaffected: e18100975f0e5a8d59d02de00df12247a91b443b , < * (git) Unaffected: e2bbad0107bba41491a4d549686fd023db8740da , < * (git) cpe:2.3:a:erlang:erlang\/otp::::::::

Date Public

2026-09-22 08:49

Credits

Michał Wąsowski / Ericsson Jakub Witczak / Ericsson

Show details on NVD website

JSON

To clipboard

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            }
          ],
          "value": "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.\n\nThe \"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.\n\nThis issue affects OTP from OTP\u00a018.1.2 before OTP\u00a027.3.4.18, OTP\u00a028.5.0.7, and OTP\u00a029.1.1, corresponding to ssh from 4.1.1 before 5.2.11.13, 5.5.2.6, and 6.0.6. Whether OTP before OTP\u00a018.1.2, corresponding to ssh before 4.1.1, is affected is unknown."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-125",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-125 Flooding"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "LOW",
            "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:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-770",
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-24T20:07:42.062Z",
        "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-qhcm-px9c-rvfh"
        },
        {
          "name": "EEF CNA record for CVE-2026-68956",
          "tags": [
            "related"
          ],
          "url": "https://cna.erlef.org/cves/CVE-2026-68956.html"
        },
        {
          "name": "OSV record EEF-CVE-2026-68956",
          "tags": [
            "related"
          ],
          "url": "https://osv.dev/vulnerability/EEF-CVE-2026-68956"
        },
        {
          "name": "Erlang/OTP version ordering",
          "tags": [
            "x_version-scheme"
          ],
          "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
        },
        {
          "name": "Introducing commit 84df3d4 in erlang/otp",
          "tags": [
            "related"
          ],
          "url": "https://github.com/erlang/otp/commit/84df3d4d0278e21a36a453bfee94799f0df67c2a"
        },
        {
          "name": "Fix commit 79c2d2b in erlang/otp",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/79c2d2be17d902c5f53969b5806b725efda831be"
        },
        {
          "name": "Fix commit e181009 in erlang/otp",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/erlang/otp/commit/e18100975f0e5a8d59d02de00df12247a91b443b"
        },
        {
          "name": "Fix commit e2bbad0 in erlang/otp",
          "tags": [
            "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": "\u003cp\u003eNo option bounds the number of idle session channels, so the following reduce exposure without eliminating the issue.\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eRestrict 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.\u003c/li\u003e\n\u003cli\u003eSet the \u003ccode\u003emax_sessions\u003c/code\u003e 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.\u003c/li\u003e\n\u003cli\u003eApply operating-system or firewall connection-rate and connection-count limits per source address.\u003c/li\u003e\n\u003cli\u003eMonitor node memory externally and restart the emulator when it exceeds a threshold.\u003c/li\u003e\n\u003c/ul\u003e\n\u003cp\u003eSetting \u003ccode\u003emax_channels\u003c/code\u003e is not a workaround: idle session channels bypass that check entirely.\u003c/p\u003e"
            },
            {
              "base64": false,
              "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": "2026-09-24T20:07:42.062Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2026-68956 (CVE-2026-68956)

CVE-2026-68956 (GCVE-0-2026-68956)

Tags

Sightings

Nomenclature

Related by attack behaviour