CVE-2026-63209
highcompress provides various compression algorithms.
compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536 security-advisories@github.com
- https://github.com/klauspost/compress/releases/tag/v1.18.7 security-advisories@github.com
- https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw security-advisories@github.com
- https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw 134c704f-9b21-4f2e-91b3-4a467353bcc0