CVE-2026-23831

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 69% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

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 v3
5.3
EG Score
5.3(medium)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
37%
KEV
Not listed

Published

January 22, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Aug 9, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

COSE v0.0.1 entry type nil pointer dereference in Canonicalize via empty Message · Advisory · sigstore/rekor · GitHub

https://github.com/sigstore/rekor/security/advisories/GHSA-273p-m2cw-6833
github_release Patch Available

v1.5.0

Patch available: sigstore/rekor v1.5.0

https://github.com/sigstore/rekor/releases/tag/v1.5.0
github_commit

commit 39bae3d192bc (sigstore/rekor)

Fix landed in sigstore/rekor commit 39bae3d192bc — awaiting tagged release

https://github.com/sigstore/rekor/commit/39bae3d192bce48ef4ef2cbd1788fb5770fee8cd

Vendor Advisories for CVE-2026-23831(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatodf4/rook-ceph-rhel9-operator:17829342842026-07-09redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(3 across 3 ecosystems)
Debian:13(1)
PackageVulnerable rangeFixed inDependents
rekor1.3.10-1 ... 1.5.3-2 (10 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
rekor1.3.10-1, 1.3.9-1, 1.4.0-1, 1.4.2-1, 1.4.3-11.5.0-1—
Go(1)
PackageVulnerable rangeFixed inDependents
github.com/sigstore/rekor—1.5.0—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 5× in last 7d / 26× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 160 total refreshes for this CVE.

  1. 2026-09-19 01:30 UTCOSV refresh
  2. 2026-09-18 19:27 UTCEPSS rescore
  3. 2026-09-16 14:07 UTCEPSS rescore
  4. 2026-09-16 05:15 UTCEPSS rescore
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  17. 2026-08-31 05:04 UTCOSV refresh
  18. 2026-08-30 19:17 UTCEPSS rescore
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  1. 2026-08-20 22:55 UTCEPSS rescore
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  6. 2026-08-16 02:14 UTCEPSS rescore
  7. 2026-08-15 01:30 UTCEPSS rescore
  8. 2026-08-14 12:50 UTCEG score recompute
  9. 2026-08-14 12:50 UTCVendor advisory
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-12 13:50 UTCEPSS rescore
  12. 2026-08-11 13:42 UTCEPSS rescore
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  14. 2026-08-09 18:39 UTCEG score recompute
  15. 2026-08-09 18:39 UTCVendor advisory
  16. 2026-08-09 13:46 UTCEPSS rescore
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  18. 2026-08-07 23:46 UTCEG score recompute
  19. 2026-08-07 23:46 UTCVendor advisory
  20. 2026-08-06 13:46 UTCEPSS rescore
  21. 2026-08-06 05:08 UTCEG score recompute
  22. 2026-08-06 05:08 UTCVendor advisory
  23. 2026-08-05 19:17 UTCEPSS rescore
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  25. 2026-08-04 10:38 UTCEPSS rescore
  26. 2026-08-03 10:35 UTCEPSS rescore
  27. 2026-08-02 22:21 UTCEG score recompute
  28. 2026-08-02 22:21 UTCVendor advisory
  29. 2026-08-02 02:26 UTCEPSS rescore
  30. 2026-08-01 04:15 UTCEPSS rescore
  31. 2026-07-31 09:12 UTCOSV refresh
  32. 2026-07-30 01:30 UTCEPSS rescore
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  41. 2026-07-23 03:07 UTCEG score recompute
  42. 2026-07-22 14:08 UTCEPSS rescore
  43. 2026-07-21 15:24 UTCEPSS rescore
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  45. 2026-07-20 17:08 UTCEPSS rescore
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  65. 2026-07-09 19:10 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2026-23831?
CVE-2026-23831 is a medium vulnerability published on January 22, 2026. 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…
When was CVE-2026-23831 disclosed?
CVE-2026-23831 was first published in the National Vulnerability Database on January 22, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-23831 actively exploited?
CVE-2026-23831 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 62.6% of all scored CVEs.
What is the CVSS score of CVE-2026-23831?
CVE-2026-23831 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-23831?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-23831, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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