Integer Overflow or Wraparound Affecting zot package, versions <2.1.18-r6


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.57% (48th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-WOLFILATEST-ZOT-21829485
  • published30 Oct 2026
  • disclosed29 Sept 2026

Introduced: 29 Sep 2026

CVE-2026-63209  (opens in a new tab)
CWE-190  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Wolfi zot to version 2.1.18-r6 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream zot package and not the zot package as distributed by Wolfi. See How to fix? for Wolfi relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1