{"id":"CVE-2026-120457","title":"libaec through 1.1.7 Out-of-Bounds Read via m_se_decode() Second Extension Decoder","summary":"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/SZI…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H","cvssSource":"cna","cwe":["CWE-196"],"vendor":"Deutsches Klimarechenzentrum","product":"libaec","affected":["libaec <= 1.1.7"],"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-02T15:45:31.200283Z"},"exploitAvailable":true,"published":"2026-11-02","updated":"2026-11-02","sourceUpdated":"2026-11-02T15:46:06.742Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-120457","references":[{"url":"https://github.com/Deutsches-Klimarechenzentrum/libaec/issues/64"},{"url":"https://github.com/Deutsches-Klimarechenzentrum/libaec/pull/66"},{"url":"https://github.com/Deutsches-Klimarechenzentrum/libaec/blob/v1.1.7/src/decode.c#L556-L586"},{"url":"https://github.com/Deutsches-Klimarechenzentrum/libaec/releases/tag/v1.1.7","label":"libaec v1.1.7 Release Notes"},{"url":"https://hackmd.io/@haindpwn/libaec-se-decode-fs-signedness-oob-read"},{"url":"https://www.vulncheck.com/advisories/libaec-through-1.1.7-out-of-bounds-read-via-m-se-decode-second-extension-decoder","label":"VulnCheck Advisory: libaec through 1.1.7 Out-of-Bounds Read via m_se_decode() Second Extension Decoder"}],"tags":["cve.org","exploit-available"],"epss":0.0024,"epssPercentile":0.15236,"ingestedAt":"2026-11-05T19:30:42.695Z","slug":"CVE-2026-120457","body":"## Overview\n\nlibaec 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.\n\n## Affected\n\n- `libaec <= 1.1.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":29.2,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[]}