CVE Catalog

CVE-2026-63209

HighCVSS 7.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.37%

28th percentile - higher than 28% of all known CVEs

Summary

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.

Risk Assessment

An attacker can supply a crafted dictionary, causing the process to crash (SIGSEGV), leading to denial of service. In some cases, memory corruption may also be possible.

Recommendation

Upgrade the compress library to version 1.18.7 or later.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS