CVE-2026-120457

medium

Description

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.

References

https://www.vulncheck.com/advisories/libaec-through-1.1.7-out-of-bounds-read-via-m-se-decode-second-extension-decoder

https://hackmd.io/@haindpwn/libaec-se-decode-fs-signedness-oob-read

https://github.com/Deutsches-Klimarechenzentrum/libaec/releases/tag/v1.1.7

https://github.com/Deutsches-Klimarechenzentrum/libaec/pull/66

https://github.com/Deutsches-Klimarechenzentrum/libaec/issues/64

https://github.com/Deutsches-Klimarechenzentrum/libaec/blob/v1.1.7/src/decode.c#L556-L586

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-115217

Details

Source: Mitre, NVD

Published: 2026-11-02

Updated: 2026-11-02

Risk Information

CVSS v2

Base Score: 4.7

Vector: CVSS2#AV:L/AC:H/Au:N/C:P/I:N/A:C

Severity: Medium

CVSS v3

Base Score: 5.3

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

Severity: Medium

CVSS v4

Base Score: 5.8

Vector: 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

Severity: Medium

EPSS

EPSS: 0.0024