Compress/s2: Integer Overflow or Wraparound and Out-of-bounds Write in compress

影響: go:github.com/klauspost/compress <= 1.18.6 → 1.18.7

Signed Integer Overflow in s2.NewDict Summary 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. Package - Name: github.com/klauspost/compress/s2 - Ecosystem: Go - Affected ve…

Read on GitHub Advisory Database

On 10/20/2026, 11:33 PM, GitHub Advisory Database published "Compress/s2: Integer Overflow or Wraparound and Out-of-bounds Write in compress" (type: Advisory). Severity is "High" (high). Related technologies: Go, GitHub. CVE: CVE-2026-63209.