High [CVE-2026-13500] Remote code injection vulnerability
This high-severity Red Hat Linux advisory covers CVE-2026-13500.
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Summary
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.
A flaw was found in ANTLR4. A remote attacker could exploit a weakness within the Grammar Action Block Handler component by executing a manipulation.
This is an Important vulnerability. A remote code injection flaw exists in the ANTLR4 Grammar Action Block Handler, which could allow an unauthenticated attacker to execute arbitrary code.
The ability for remote exploitation and the public availability of exploit details elevate the risk, making this a critical concern for Red Hat products that incorporate ANTLR4 and process untrusted input. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L).
Weakness: CWE-94. Red Hat lists Red Hat Enterprise Linux 8 as not affected.
- 4.13.2
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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