Klauspost Compress vulnerabilities

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Published CVEs affecting Klauspost Compress: 1 record(s), with affected versions and fixes.

CVE-2026-63209 High · 7.5 CWE-190 Sep 29, 2026

Integer Overflow or Wraparound and Out-of-bounds Write in compress

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.