CVE-2026-13503

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-06-28. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

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

A vulnerability was detected in antlr ANTLR4 up to 4.13.2. Affected by this issue is the function getImportedVocabFile of the file tool/src/org/antlr/v4/parse/TokenVocabParser.java of the component tokenVocab Grammar Option Handler. The manipulation results in path traversal. The attack can be executed remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
5.3
EG Score
5.3(high)
EPSS
42.0%
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_005_Path_Traversal_tokenVocab_File_Read · Issue #8 · wooyun123/wooyun · GitHub

https://github.com/wooyun123/wooyun/issues/8

Vendor Advisories for CVE-2026-13503(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 30× 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 05:01 UTCEG score recompute
  2. 2026-07-07 05:01 UTCGHSA enrichment
  3. 2026-07-06 16:27 UTCEPSS rescore
  4. 2026-07-06 03:19 UTCEG score recompute
  5. 2026-07-06 03:19 UTCGHSA enrichment
  6. 2026-07-06 02:23 UTCEPSS rescore
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-05 01:39 UTCEG score recompute
  10. 2026-07-05 01:39 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-03 23:58 UTCEG score recompute
  13. 2026-07-03 23:58 UTCGHSA enrichment
  14. 2026-07-02 22:19 UTCEG score recompute
  15. 2026-07-02 22:19 UTCGHSA enrichment
  16. 2026-07-01 20:38 UTCEG score recompute
  17. 2026-07-01 20:38 UTCGHSA enrichment
  18. 2026-07-01 15:06 UTCEPSS rescore
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:22 UTCEPSS rescore
  21. 2026-06-30 18:59 UTCEG score recompute
  22. 2026-06-30 18:58 UTCGHSA enrichment
  23. 2026-06-29 17:19 UTCEG score recompute
  24. 2026-06-29 17:19 UTCGHSA enrichment
  25. 2026-06-29 15:26 UTCNVD updateCVSS v4 → 5.5
Show 5 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-29 13:32 UTCMITRE cvelistV5CVSS v4 → 6.9
  3. 2026-06-28 18:02 UTCNVD updateCVSS v4 → 5.5
  4. 2026-06-28 15:38 UTCEG score recompute
  5. 2026-06-28 15:37 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13503?
CVE-2026-13503 is a medium vulnerability published on June 28, 2026. A vulnerability was detected in antlr ANTLR4 up to 4.13.2. Affected by this issue is the function getImportedVocabFile of the file tool/src/org/antlr/v4/parse/TokenVocabParser.java of the component tokenVocab Grammar Option Handler. The manipulation results in path traversal. The attack can be…
When was CVE-2026-13503 disclosed?
CVE-2026-13503 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-2026-13503 actively exploited?
CVE-2026-13503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 42.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13503?
CVE-2026-13503 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-13503?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13503, 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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