CVE-2026-120457

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://github.com/Deutsches-Klimarechenzentrum/libaec/blob/v1.1.7/src/decode.c#L556-L586
• https://github.com/Deutsches-Klimarechenzentrum/libaec/issues/64
• https://github.com/Deutsches-Klimarechenzentrum/libaec/pull/66
• https://github.com/Deutsches-Klimarechenzentrum/libaec/releases/tag/v1.1.7
• https://hackmd.io/@haindpwn/libaec-se-decode-fs-signedness-oob-read