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.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-619f648cde advisory.

    This update contains a fix for CVE-2026-13503.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-d9ca28a7b8 advisory.

    This update contains a fix for CVE-2026-13503.


Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-13503)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
327802	Fedora 44 : antlr4-project (2026-619f648cde)	Nessus	Fedora Local Security Checks	medium
327800	Fedora 43 : antlr4-project (2026-d9ca28a7b8)	Nessus	Fedora Local Security Checks	medium
323605	Linux Distros Unpatched Vulnerability : CVE-2026-13503	Nessus	Misc.	medium

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CVE-2026-13503

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