Vulnerability in Deutsches Klimarechenzentrum Libaec
CVE-2026-120457
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/Deutsches-Klimarechenzentrum/libaec/issues/64 (issue-tracking)
- github.com/Deutsches-Klimarechenzentrum/libaec/pull/66 (issue-tracking, patch)
- github.com/Deutsches-Klimarechenzentrum/libaec/blob/v1.1.7/src/decode.c (technical-description)
- github.com/Deutsches-Klimarechenzentrum/libaec/releases/tag/v1.1.7 (release-notes)
- hackmd.io/@haindpwn/libaec-se-decode-fs-signedness-oob-read (technical-description)
- www.vulncheck.com/advisories/libaec-through-1.1.7-out-of-bounds-read-via-m-se-d… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-120457?
- CVE-2026-120457 is a medium-severity vulnerability in Deutsches Klimarechenzentrum Libaec, classified under CWE-196. CVSS score: 5.3/10. Published 2026-11-02.
- How severe is CVE-2026-120457?
- Medium severity. CVSS v3 base score is 5.3 out of 10.