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  4. CVE 2026 120830 libslirp libslirp out of bounds heap read in
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Back to active CVEs
High · CVSS 7.4CVE-2026-120830

Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosureCVE-2026-120830

Answer in brief

CVE-2026-120830 records a High severity (CVSS 7.4) vulnerability in Libslirp: libslirp: out-of-bounds heap read in icmp_forward_error() leading to information disclosure. The current sources do not mark it as known exploited. The current feed maps Red Hat/container-tools:rhel8/libslirp (generic), Red Hat/libslirp (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Nov 3, 2026Updated Nov 3, 2026Source checked Nov 3, 2026First seen by HOL Nov 3, 2026Material review Nov 3, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.4
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 7.4. 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 Red Hat/container-tools:rhel8/libslirp (generic), Red Hat/libslirp (generic), Red Hat/openshift/ose-rhel-coreos-8 (generic), Red Hat/openshift/ose-rhel-coreos-9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/container-tools:rhel8/libslirpgeneric*Not reported
Red Hat/libslirpgeneric*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 Red Hat/container-tools:rhel8/libslirp, Red Hat/libslirp, Red Hat/openshift/ose-rhel-coreos-8.
  2. 2Review the reported fix. Source-reported workaround: Red Hat is not aware of a practical temporary workaround that fully mitigates this issue or meets Red Hat Product Security's standards for usability, deployment, applicability, or stability. Customers are advised to apply the relevant security updates when/if they become available.

Evidence timeline and material changes

  1. Published upstream

    Nov 3, 2026

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

  2. Source modified

    Nov 3, 2026

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

  3. First seen by HOL

    Nov 3, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
  • Source referencegitlab.freedesktop.org
Upstream source description

A flaw was found in libslirp in icmp_forward_error(). When building an ICMP error response, the length of the quoted original IPv4 packet was taken from the IP header without clamping it to the actual buffer length. A truncated or malformed packet could cause an out-of-bounds heap read, leaking host memory into the ICMP error packet returned to a guest or container.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • psqlODBC does not validate server-supplied counts and lengthsAlso CWE-125
  • Hivex: hivex: denial of service via out-of-bounds read in big-data block processingAlso CWE-125

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-125
Source
CVE List V5
Source checked
Nov 3, 2026
References
3 linked sources
Open source record