Vulnerability Details CVE-2026-23831
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 12.4%
CVSS Severity
CVSS v3 Score 5.3
References
Products affected by CVE-2026-23831
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cpe:2.3:a:linuxfoundation:rekor:0.1.0
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cpe:2.3:a:linuxfoundation:rekor:0.1.1
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cpe:2.3:a:linuxfoundation:rekor:0.10.0
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cpe:2.3:a:linuxfoundation:rekor:0.11.0
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cpe:2.3:a:linuxfoundation:rekor:0.12.0
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cpe:2.3:a:linuxfoundation:rekor:0.12.1
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cpe:2.3:a:linuxfoundation:rekor:0.12.2
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cpe:2.3:a:linuxfoundation:rekor:0.2.0
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cpe:2.3:a:linuxfoundation:rekor:0.3.0
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cpe:2.3:a:linuxfoundation:rekor:0.4.0
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cpe:2.3:a:linuxfoundation:rekor:0.5.0
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cpe:2.3:a:linuxfoundation:rekor:0.6.0
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cpe:2.3:a:linuxfoundation:rekor:0.7.0
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cpe:2.3:a:linuxfoundation:rekor:0.8.0
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cpe:2.3:a:linuxfoundation:rekor:0.8.1
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cpe:2.3:a:linuxfoundation:rekor:0.8.2
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cpe:2.3:a:linuxfoundation:rekor:0.9.0
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cpe:2.3:a:linuxfoundation:rekor:0.9.1
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cpe:2.3:a:linuxfoundation:rekor:1.0.0
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cpe:2.3:a:linuxfoundation:rekor:1.0.1
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cpe:2.3:a:linuxfoundation:rekor:1.1.0
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cpe:2.3:a:linuxfoundation:rekor:1.1.1
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cpe:2.3:a:linuxfoundation:rekor:1.2.0
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cpe:2.3:a:linuxfoundation:rekor:1.2.1
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cpe:2.3:a:linuxfoundation:rekor:1.2.2
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cpe:2.3:a:linuxfoundation:rekor:1.3.0
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cpe:2.3:a:linuxfoundation:rekor:1.3.1
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cpe:2.3:a:linuxfoundation:rekor:1.3.10
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cpe:2.3:a:linuxfoundation:rekor:1.3.2
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cpe:2.3:a:linuxfoundation:rekor:1.3.3
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cpe:2.3:a:linuxfoundation:rekor:1.3.4
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cpe:2.3:a:linuxfoundation:rekor:1.3.5
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cpe:2.3:a:linuxfoundation:rekor:1.3.6
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cpe:2.3:a:linuxfoundation:rekor:1.3.7
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cpe:2.3:a:linuxfoundation:rekor:1.3.8
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cpe:2.3:a:linuxfoundation:rekor:1.3.9
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cpe:2.3:a:linuxfoundation:rekor:1.4.0
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cpe:2.3:a:linuxfoundation:rekor:1.4.1
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cpe:2.3:a:linuxfoundation:rekor:1.4.2
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cpe:2.3:a:linuxfoundation:rekor:1.4.3