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.

amazon-cloudwatch-agent-1.300073.0-1.1 on GA media

github.com/klauspost/compress: klauspost/compress: Denial of Service via integer overflow in dictionary processing

Affected: Ubuntu:16.04:LTS: golang-github-klauspost-compress, Ubuntu:18.04:LTS: golang-github-klauspost-compress, Ubuntu:20.04:LTS: golang-github-klauspost-compress, Ubuntu:22.04:LTS: golang-github-klauspost-compress, Ubuntu:24.04:LTS: golang-github-klauspost-compress, Ubuntu:26.04:LTS: golang-github-klauspost-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.