CVE WatchSep 29, 2026

CVE-2026-63209

compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an

CVSS

7.5

High

EPSS

0.4%

p29

KEV

—

Exploit Today

0-100

Published: Sep 29, 2026 · Last modified: Sep 29, 2026 · CWE-190 · CWE-787

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-09-302026-10-19

Technical description

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.

Official references

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