What’s Vulnerable › Vulnerabilities

CVE-2023-33199: malformed proposed intoto v0.0.2 entries can cause a panic in Rekor

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-05-26 · updated 2026-06-17
• Weakness: CWE-617

Description

Rekor's goals are to provide an immutable tamper resistant ledger of metadata generated within a software projects supply chain. A malformed proposed entry of the `intoto/v0.0.2` 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 has been fixed in v1.2.0 of Rekor. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Affected products

• sigstore rekor: before 1.2.0 — fixed in 1.2.0

How to fix

Upgrade to a fixed version: sigstore rekor 1.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/sigstore/rekor/commit/140c5add105179e5ffd9e3e114fd1b6b93aebbd4
• https://github.com/sigstore/rekor/security/advisories/GHSA-frqx-jfcm-6jjr
• https://github.com/sigstore/rekor/commit/140c5add105179e5ffd9e3e114fd1b6b93aebbd4
• https://github.com/sigstore/rekor/security/advisories/GHSA-frqx-jfcm-6jjr

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