What is CVE-2023-33199?

CVE-2023-33199 is a medium-severity vulnerability in Linuxfoundation Rekor, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2023-05-26.

How severe is CVE-2023-33199?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Linuxfoundation Rekor

CVE-2023-33199

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.

Published 2023-05-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.007 (50.0th percentile), scored 2026-09-27.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Linuxfoundation Rekor
Sigstore Rekor — versions < 1.2.0

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

github.com/sigstore/rekor/security/advisories/GHSA-frqx-jfcm-6jjr (Vendor Advisory)
github.com/sigstore/rekor/commit/140c5add105179e5ffd9e3e114fd1b6b93aebbd4 (Patch)

Frequently asked questions

What is CVE-2023-33199?: CVE-2023-33199 is a medium-severity vulnerability in Linuxfoundation Rekor, classified under Reachable Assertion. CVSS score: 5.3/10. Published 2023-05-26.
How severe is CVE-2023-33199?: Medium severity. CVSS v3 base score is 5.3 out of 10.