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

- 種別: advisory
- 重大度: high
- 関連技術: go, github
- CVE: CVE-2026-63209
- 公開日時: 2026-10-20T14:33:33.000Z
- 情報源: GitHub Advisory Database (https://github.com/advisories/GHSA-259r-337f-4rfw)
- パーマリンク: https://vulnpulse.app/items/ghsa-ghsa-259r-337f-4rfw

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…