CVE-2025-26466
- Source
- https://cve.org/CVERecord?id=CVE-2025-26466
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-26466.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-26466
- Downstream
ALPINE (1)
AZL (1)
BELL (1)
DEBIAN (1)
OESA (1)
openSUSE (1)
RHBA (1)
RHSA (1)
UBUNTU (1)
- Related
- Published
- 2025-02-28T21:25:28Z
- Modified
- 2026-10-24T10:30:17Z
- Severity
-
- 5.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Openssh: denial-of-service in openssh
- Details
-
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
- Database specific
{ "cna_assigner": "redhat", "cwe_ids": [ "CWE-770" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/26xxx/CVE-2025-26466.json", "unresolved_ranges": [ { "extracted_events": [ { "range": [ { "fixed": "0:9.9p1-7.el10_0" }, { "fixed": "0:8.7p1-45.el9" }, { "fixed": "0:8.7p1-45.el9" } ], "source": "AFFECTED_FIELD", "strategy": "InverseAffectedRanges" } ] }, { "extracted_events": [ { "range": [ { "introduced": "9.5p1" }, { "last_affected": "9.9p1" } ], "source": "AFFECTED_FIELD", "strategy": "StandardRange" } ] } ] }- References
-
- http://seclists.org/fulldisclosure/2025/Feb/18
- http://seclists.org/fulldisclosure/2025/May/7
- http://seclists.org/fulldisclosure/2025/May/8
- https://access.redhat.com/downloads/content/package-browser/
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://seclists.org/oss-sec/2025/q1/144
- https://security-tracker.debian.org/tracker/CVE-2025-26466
- https://ubuntu.com/security/CVE-2025-26466
- https://www.openssh.com/
- https://www.openwall.com/lists/oss-security/2025/02/18/1
- https://www.openwall.com/lists/oss-security/2025/02/18/4
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
- https://www.vicarius.io/vsociety/posts/cve-2025-26466-detection-script-memory-consumption-vulnerability-in-openssh
- https://www.vicarius.io/vsociety/posts/cve-2025-26466-mitigation-script-memory-consumption-vulnerability-in-openssh
- https://access.redhat.com/errata/RHBA-2025:6305
- https://access.redhat.com/errata/RHSA-2025:6993
- https://access.redhat.com/security/cve/CVE-2025-26466
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/26xxx/CVE-2025-26466.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-26466
- https://security.netapp.com/advisory/ntap-20250228-0002/
- https://bugzilla.redhat.com/show_bug.cgi?id=2345043
- https://bugzilla.suse.com/show_bug.cgi?id=1237041
- https://anongit.mindrot.org/openssh.git
Affected packages
Git / github.com/openssh/openssh-portable
Affected ranges
- Type
- GIT
- Repo
- https://github.com/openssh/openssh-portable
- Events
-
IntroducedLast Affected
- Database specific
-
Show details
{ "extracted_events": [ { "cpe": "cpe:2.3:a:openbsd:openssh:9.5:p1:*:*:*:*:*:*", "range": [ { "introduced": "9.5-p1" }, { "last_affected": "9.5-p1" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.6:-:*:*:*:*:*:*", "range": [ { "introduced": "9.6-NA" }, { "last_affected": "9.6-NA" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.6:p1:*:*:*:*:*:*", "range": [ { "introduced": "9.6-p1" }, { "last_affected": "9.6-p1" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.7:-:*:*:*:*:*:*", "range": [ { "introduced": "9.7-NA" }, { "last_affected": "9.7-NA" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.7:p1:*:*:*:*:*:*", "range": [ { "introduced": "9.7-p1" }, { "last_affected": "9.7-p1" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.8:-:*:*:*:*:*:*", "range": [ { "introduced": "9.8-NA" }, { "last_affected": "9.8-NA" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.8:p1:*:*:*:*:*:*", "range": [ { "introduced": "9.8-p1" }, { "last_affected": "9.8-p1" } ], "source": "CPE_STRING" }, { "cpe": "cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:*", "range": [ { "introduced": "9.9-p1" }, { "last_affected": "9.9-p1" } ], "source": "CPE_STRING" } ] }