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NULL Pointer Dereference

CVE-2026-23831

Medium
5.3/10

Summary

Rekor is a software supply chain transparency log. In versions through 1.4.3, the entry implementation can panic on attacker-controlled input when canonicalizing a proposed entry with an empty "spec.message", causing NULL 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.

  • LOW
  • NETWORK
  • NONE
  • UNCHANGED
  • NONE
  • NONE
  • NONE
  • LOW

CWE-476 - NULL Pointer Dereference

A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.

References

Advisory Timeline

  • Published