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.

Attack Vector Local

Attack Complexity Low

Privileges Required None

Attack Requirements Present

User Interaction Passive

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Local

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation poc

Automatable no

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Deutsches Klimarechenzentrum libaec unaffected
Version Status Constraints
0 affected ≤ 1.1.7

No data.

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/Deutsches-Klimarechenzentrum/libaec/blob/v1.1.7/src/decode.c#L556-L586 cve-icon cve-icon
https://github.com/Deutsches-Klimarechenzentrum/libaec/issues/64 cve-icon cve-icon
https://github.com/Deutsches-Klimarechenzentrum/libaec/pull/66 cve-icon cve-icon
https://github.com/Deutsches-Klimarechenzentrum/libaec/releases/tag/v1.1.7 cve-icon cve-icon
https://hackmd.io/@haindpwn/libaec-se-decode-fs-signedness-oob-read cve-icon cve-icon cve-icon
https://www.vulncheck.com/advisories/libaec-through-1.1.7-out-of-bounds-read-via-m-se-decode-second-extension-decoder cve-icon cve-icon
History

Mon, 02 Nov 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 02 Nov 2026 14:30:00 +0000

Type Values Removed Values Added
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.
Title libaec through 1.1.7 Out-of-Bounds Read via m_se_decode() Second Extension Decoder
Weaknesses CWE-196
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H'}

cvssV4_0

{'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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-11-02T15:46:06.742Z

Reserved: 2026-11-02T12:42:22.624Z

Link: CVE-2026-120457

cve-icon Vulnrichment

Updated: 2026-11-02T15:45:55.350Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-02T15:17:29.507

Modified: 2026-11-02T19:34:23.993

Link: CVE-2026-120457

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-11-02T15:45:17Z

Weaknesses