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ANTLR4 CVE-2026-13503

| EUVDEUVD-2026-40001 MEDIUM
Path Traversal (CWE-22)
2026-06-28 VulDB GHSA-w346-wxvq-p3xr
Java Path Traversal Antlr4 Red Hat Suse
5.5
CVSS 4.0 · Vendor: VulDB
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Severity by source

Vendor (VulDB) PRIMARY
5.5 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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
vuln.today AI
5.3 MEDIUM

Network-reachable build tool processing untrusted grammar files; no authentication or interaction required; impact limited to low-confidentiality file read only.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Red Hat
5.3 MEDIUM
qualitative

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
CVSS changed
Jun 28, 2026 - 16:22 NVD
6.9 (MEDIUM) 5.5 (MEDIUM)
Analysis Generated
Jun 28, 2026 - 16:16 vuln.today

DescriptionCVE.org

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.

AnalysisAI

Path traversal in ANTLR4 up to 4.13.2 exposes arbitrary file read via the tokenVocab grammar option handler. The vulnerable function getImportedVocabFile in TokenVocabParser.java fails to sanitize user-controlled grammar option values, allowing an attacker to supply a crafted .g4 grammar file that causes the tool to read files outside the intended working directory. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Craft grammar file with tokenVocab traversal payload
Delivery
Submit or inject grammar into target build pipeline
Exploit
ANTLR4 tool invoked on malicious grammar
Execution
getImportedVocabFile resolves traversal path
Persist
Sensitive file contents read from host filesystem
Impact
Data exfiltrated via build logs or output artifacts
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Vulnerability AssessmentAI

Exploitation Exploitation requires that an attacker control or influence the value of the tokenVocab grammar option within an ANTLR4 grammar (.g4) file that is processed by the ANTLR4 build tool (versions through 4.13.2). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N) scores 6.9 and signals a low-complexity, unauthenticated network-reachable path traversal with limited confidentiality impact and no integrity or availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker contributes or injects a malicious ANTLR4 grammar file into a repository or dependency source, embedding a tokenVocab option value containing a path traversal sequence such as ../../../../home/user/.ssh/id_rsa. When a developer or automated CI/CD pipeline runs the ANTLR4 tool against this grammar, getImportedVocabFile resolves the traversal path and reads the target file's contents. …
Remediation No vendor-released patch has been identified at the time of analysis - the vendor did not respond to the coordinated disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Module for Package Hub 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP5 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP6 Affected
openSUSE Leap 15.3 Affected
openSUSE Leap 15.4 Affected

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CVE-2026-13503 vulnerability details – vuln.today
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