CVE-2026-13500

HIGHPre-NVD 7.37.3—
EchelonGraph scoreHIGH confidence

Score 7.3 from GitHub Security Advisory published 2026-06-28. a secondary CVSS source baseline 7.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
7.3
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

A weakness has been identified in antlr ANTLR4 up to 4.13.2. Affected is an unknown function of the file tool/src/org/antlr/v4/codegen/model/OutputFile.java of the component Grammar Action Block Handler. Executing a manipulation can lead to code injection. The attack may be launched remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
7.3
EG Score
7.3(high)
EPSS
22.9%
KEV
Not listed

Published

June 28, 2026

Last Modified

June 29, 2026

Advisory Details (1)

Auto-updated Jun 28, 2026
No patch confirmed yet.
generic

antlr4_001_Code_Injection_via_Grammar_Actions · Issue #4 · wooyun123/wooyun · GitHub

https://github.com/wooyun123/wooyun/issues/4

Vendor Advisories for CVE-2026-13500(1)

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

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 34× in last 7d / 46× 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.

  1. 2026-07-07 08:28 UTCEG score recompute
  2. 2026-07-07 08:28 UTCGHSA enrichment
  3. 2026-07-06 19:18 UTCEG score recompute
  4. 2026-07-06 19:18 UTCGHSA enrichment
  5. 2026-07-06 16:27 UTCEPSS rescore
  6. 2026-07-06 06:11 UTCEG score recompute
  7. 2026-07-06 06:11 UTCGHSA enrichment
  8. 2026-07-06 02:23 UTCEPSS rescore
  9. 2026-07-05 17:03 UTCEG score recompute
  10. 2026-07-05 17:03 UTCGHSA enrichment
  11. 2026-07-05 03:57 UTCEG score recompute
  12. 2026-07-05 03:57 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-05 02:30 UTCEPSS rescore
  15. 2026-07-04 14:46 UTCEG score recompute
  16. 2026-07-04 14:46 UTCGHSA enrichment
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-04 01:40 UTCEG score recompute
  19. 2026-07-04 01:40 UTCGHSA enrichment
  20. 2026-07-03 12:35 UTCEG score recompute
  21. 2026-07-03 12:35 UTCGHSA enrichment
  22. 2026-07-02 23:16 UTCEG score recompute
  23. 2026-07-02 23:16 UTCGHSA enrichment
  24. 2026-07-02 10:11 UTCEG score recompute
  25. 2026-07-02 10:11 UTCGHSA enrichment
Show 21 more
  1. 2026-07-01 21:05 UTCEG score recompute
  2. 2026-07-01 21:05 UTCGHSA enrichment
  3. 2026-07-01 15:06 UTCEPSS rescore
  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-07-01 08:00 UTCEG score recompute
  6. 2026-07-01 08:00 UTCGHSA enrichment
  7. 2026-06-30 23:22 UTCEPSS rescore
  8. 2026-06-30 18:55 UTCEG score recompute
  9. 2026-06-30 18:55 UTCGHSA enrichment
  10. 2026-06-30 05:50 UTCEG score recompute
  11. 2026-06-30 05:50 UTCGHSA enrichment
  12. 2026-06-29 16:44 UTCEG score recompute
  13. 2026-06-29 16:44 UTCGHSA enrichment
  14. 2026-06-29 15:26 UTCNVD updateCVSS v4 → 5.5
  15. 2026-06-29 14:06 UTCEPSS rescore
  16. 2026-06-29 13:32 UTCMITRE cvelistV5CVSS v4 → 6.9
  17. 2026-06-29 03:38 UTCEG score recompute
  18. 2026-06-29 03:38 UTCGHSA enrichment
  19. 2026-06-28 16:02 UTCNVD updateCVSS v4 → 5.5
  20. 2026-06-28 14:32 UTCEG score recompute
  21. 2026-06-28 14:32 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-13500?
CVE-2026-13500 is a high vulnerability published on June 28, 2026. A weakness has been identified in antlr ANTLR4 up to 4.13.2. Affected is an unknown function of the file tool/src/org/antlr/v4/codegen/model/OutputFile.java of the component Grammar Action Block Handler. Executing a manipulation can lead to code injection. The attack may be launched remotely. The…
When was CVE-2026-13500 disclosed?
CVE-2026-13500 was first published in the National Vulnerability Database on June 28, 2026, with the most recent update on June 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-13500 actively exploited?
CVE-2026-13500 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 22.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13500?
CVE-2026-13500 has a CVSS v3 base score of 7.3 (NVD).
How do I remediate CVE-2026-13500?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13500, 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.

Dependency Blast Radius

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