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Back to active CVEs
Low · CVSS 3.1CVE-2025-8277

Libssh: memory exhaustion via repeated key exchange in libsshCVE-2025-8277

Answer in brief

CVE-2025-8277 records a Low severity (CVSS 3.1) vulnerability in Libssh: memory exhaustion via repeated key exchange in libssh. The current sources do not mark it as known exploited. The current feed maps libssh (generic), Red Hat/libssh (generic), Red Hat/libssh2 (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 9, 2025Updated Oct 18, 2026Source checked Nov 4, 2026First seen by HOL Jun 25, 2026Material review Oct 18, 2026
Upstream Advisory

Key facts

Risk
Low · CVSS 3.1
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 3.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps libssh (generic), Red Hat/libssh (generic), Red Hat/libssh2 (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
libsshgeneric>=0.6.0 <0.11.30.11.3
Red Hat/libsshgeneric*Not reported
Red Hat/libssh2generic*Not reported
Red Hat/openshift/ose-rhel-coreos-8generic*Not reported
Red Hat/openshift/ose-rhel-coreos-9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for libssh, Red Hat/libssh, Red Hat/libssh2.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. It is strongly advised to apply updated libssh packages once available to prevent memory exhaustion risks on client systems.

Evidence timeline and material changes

  1. Published upstream

    Sep 9, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 18, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jun 25, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencelibssh.org
Upstream source description

A flaw was found in libssh's handling of key exchange (KEX) processes when a client repeatedly sends incorrect KEX guesses. The library fails to free memory during these rekey operations, which can gradually exhaust system memory. This issue can lead to crashes on the client side, particularly when using libgcrypt, which impacts application stability and availability.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-401
Source
CVE List V5
Source checked
Nov 4, 2026
References
4 linked sources
Open source record