CVE-2026-13500

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.51% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 43.6% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-25.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-06-28 14:15Z4 MO AGO

Last updated

2026-06-29 12:37Z4 MO AGO

Reserved

2026-06-27

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 6.9)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Weaknesses

• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
• CWE-94Improper Control of Generation of Code ('Code Injection')Base

Data version

5.2

Document digest

6e46955d14abb7aa111ee789b8079b92ad6aa94678dd2b6de6e37daf24c5954b

• vuldb.comVDB-374495 | antlr ANTLR4 Grammar Action Block OutputFile.java code injectionhttps://vuldb.com/vuln/374495vdb-entry
• vuldb.comVDB-374495 | CTI Indicators (IOB, IOC, TTP, IOA)https://vuldb.com/vuln/374495/ctisignaturepermissions-required
• vuldb.comCVE-2026-13500 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-13500third-party-advisory
• vuldb.comSubmit #838568 | antlr ANTLR4 4.13.2 Code Injectionhttps://vuldb.com/submit/838568third-party-advisory
• github.comhttps://github.com/wooyun123/wooyun/issues/4exploitissue-tracking