NULL Pointer Dereference Affecting skopeo-oci-compat package, versions <1.20.0-r0


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.38% (30th percentile)

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  • Snyk IDSNYK-MINIMOSLATEST-SKOPEOOCICOMPAT-15168872
  • published2 Feb 2026
  • disclosed22 Jan 2026

Introduced: 22 Jan 2026

CVE-2026-23831  (opens in a new tab)
CWE-476  (opens in a new tab)

How to fix?

Upgrade Minimos:latest skopeo-oci-compat to version 1.20.0-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream skopeo-oci-compat package and not the skopeo-oci-compat package as distributed by Minimos. See How to fix? for Minimos:latest relevant fixed versions and status.

Rekor is a software supply chain transparency log. In versions 1.4.3 and below, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty spec.message, causing nil Pointer Dereference. Function validate() returns nil (success) when message is empty, leaving sign1Msg uninitialized, and Canonicalize() later dereferences v.sign1Msg.Payload. A malformed proposed entry of the cose/v0.0.1 type can cause a panic on a thread within the Rekor process. The thread is recovered so the client receives a 500 error message and service still continues, so the availability impact of this is minimal. This issue has been fixed in version 1.5.0.

CVSS Base Scores

version 3.1