CVE-2026-13502

MEDIUMPre-NVD 4.54.5—
EchelonGraph scoreHIGH confidence

Score 4.5 from GitHub Security Advisory (severity: LOW) published 2026-06-28. a secondary CVSS source baseline 4.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Elevated
4.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.5Exploit: NoneExposed: 0

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

A flaw has been found in antlr ANTLR4 up to 4.13.2. This affects the function ObjectInputStream.readObject of the file antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/GrammarDependencies.java of the component Maven Plugin. This manipulation causes time-of-check time-of-use. The attack is restricted to local execution. A high degree of complexity is needed for the attack. It is indicated that the exploitability is difficult. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS v3
4.5
EG Score
4.5(high)
EG Risk
36(Track)
EG Risk 36/100SSVC: 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
Severity45% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
0.6%
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_003_Unsafe_Java_Deserialization_Maven_Plugin · Issue #7 · wooyun123/wooyun · GitHub

https://github.com/wooyun123/wooyun/issues/7

Vendor Advisories for CVE-2026-13502(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 4× in last 7d / 38× 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. 2026-07-23 03:05 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
  4. 2026-07-20 17:08 UTCEPSS rescore
  5. 2026-07-16 17:02 UTCEPSS rescore
  6. 2026-07-16 09:45 UTCGHSA enrichment
  7. 2026-07-15 16:57 UTCEPSS rescore
  8. 2026-07-15 08:41 UTCGHSA enrichment
  9. 2026-07-14 07:33 UTCGHSA enrichment
  10. 2026-07-13 22:30 UTCEPSS rescore
  11. 2026-07-13 06:26 UTCGHSA enrichment
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-12 05:20 UTCGHSA enrichment
  14. 2026-07-11 08:27 UTCEPSS rescore
  15. 2026-07-11 04:16 UTCGHSA enrichment
  16. 2026-07-10 03:08 UTCGHSA enrichment
  17. 2026-07-09 02:04 UTCGHSA enrichment
  18. 2026-07-08 00:57 UTCGHSA enrichment
  19. 2026-07-07 13:46 UTCEPSS rescore
  20. 2026-07-06 23:53 UTCGHSA enrichment
  21. 2026-07-06 16:27 UTCEPSS rescore
  22. 2026-07-06 02:23 UTCEPSS rescore
  23. 2026-07-05 22:39 UTCGHSA enrichment
  24. 2026-07-04 21:35 UTCGHSA enrichment
  25. 2026-07-04 06:31 UTCEPSS rescore
Show 13 more
  1. 2026-07-03 20:31 UTCGHSA enrichment
  2. 2026-07-02 19:27 UTCGHSA enrichment
  3. 2026-07-01 18:23 UTCGHSA enrichment
  4. 2026-07-01 15:06 UTCEPSS rescore
  5. 2026-07-01 15:06 UTCEPSS rescore
  6. 2026-06-30 17:17 UTCGHSA enrichment
  7. 2026-06-29 16:13 UTCGHSA enrichment
  8. 2026-06-29 15:26 UTCNVD updateCVSS v4 → 1.1
  9. 2026-06-29 14:52 UTCMITRE cvelistV5CVSS v4 → 2
  10. 2026-06-29 14:06 UTCEPSS rescore
  11. 2026-06-28 16:02 UTCNVD updateCVSS v4 → 1.1
  12. 2026-06-28 15:08 UTCEG score recompute
  13. 2026-06-28 15:07 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-13502?
CVE-2026-13502 is a medium vulnerability published on June 28, 2026. A flaw has been found in antlr ANTLR4 up to 4.13.2. This affects the function ObjectInputStream.readObject of the file antlr4-maven-plugin/src/main/java/org/antlr/mojo/antlr4/GrammarDependencies.java of the component Maven Plugin. This manipulation causes time-of-check time-of-use. The attack is…
When was CVE-2026-13502 disclosed?
CVE-2026-13502 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-2026-13502 actively exploited?
CVE-2026-13502 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-13502?
CVE-2026-13502 has a CVSS v3 base score of 4.5 (NVD).
How do I remediate CVE-2026-13502?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-13502, 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

Explore the affected products and dependency analysis for CVE-2026-13502

Explore →

Is Your Infrastructure Affected by CVE-2026-13502?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs