CVE-2026-120457

5.8 mediumEPSS 0.2%

Medium (5.8). EPSS 0.2% estimated probability of exploitation activity in the next 30 days.

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Severity
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Linux distributions
Red Hat
Attack patterns (CAPEC)
References
Your exposure

libaec through 1.1.7 contains an out-of-bounds read vulnerability in m_se_decode() in src/decode.c that allows attackers to bypass a signed bounds check via an overlong fundamental sequence. Attackers can supply a crafted CCSDS 121.0/SZIP stream with 2^31 or more zero bits to crash the decoder or leak adjacent memory into decoded samples.

Severity

CVSS 4.0

5.8 medium

CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

5.3 medium

CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS: 0.2% (unchanged from 0.2% a week ago) estimated probability of exploitation activity in the next 30 days; 15th percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CWE: CWE-196 Unsigned to Signed Conversion Error
Published: 2026-11-02 15:17 UTC
Modified: 2026-11-02 19:34 UTC
NVD analysis: Awaiting analysis
Record from: the NVD, synced 2026-11-02 20:02 UTC

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Explain CVE-2026-120457 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-120457?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-120457?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-120457 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.

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Linux distributions

Distribution	Release	Package	Fixed in	Advisory
Debian	12, 13, 14	libaec	no fix listed	DEBIAN-CVE-2026-120457
Ubuntu	16.04:LTS, 18.04:LTS, 20.04:LTS and 4 more	libaec	no fix listed	UBUNTU-CVE-2026-120457
openSUSE	Tumbleweed	libaec	1.1.8-1.1	openSUSE-SU-2026:12461-1
Azure Linux	3	libaec	no fix listed	AZL-112580

From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; SUSE security data, CC BY 4.0; Microsoft's Azure Linux vulnerability data, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · openSUSE.

Red Hat

Red Hat rates this Moderate.

Red Hat's statement

Red Hat rates this vulnerability as Moderate because exploitation requires a user or application to process a maliciously crafted compressed data stream, restricting the blast radius to the local decoding process. In standard Red Hat deployments, libaec operates as a shared library for specialized data processing rather than an exposed network daemon. While an attacker can trigger an out-of-bounds read resulting in application termination or partial memory leakage into output samples, the flaw does not facilitate arbitrary code execution.

Product	Package	State	Advisory
Red Hat Enterprise Linux 8	libaec	Fix deferred
Red Hat Enterprise Linux AI (RHEL AI) 3	libaec	Fix deferred

Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-120457.

Attack patterns (CAPEC)

CAPEC-92 Forced Integer Overflow Likelihood: High · Severity: High

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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