CVE-2026-13501
Description
A flaw was found in antlr ANTLR4. This vulnerability allows a local attacker to execute arbitrary commands by manipulating the GoTarget function within the gofmt component. This command injection can lead to unauthorized actions on the system where the affected software is running.
Statement
This flaw is a command injection in the GoTarget code-generation class (tool/src/org/antlr/v4/codegen/target/GoTarget.java) of the ANTLR4 tool, triggered when ANTLR4 generates a Go-language parser and invokes gofmt. The vulnerable code exists only in the ANTLR4 (4.x) generator tool.
Red Hat products do not ship the affected ANTLR4 Go-target generator. The antlr packages in Red Hat Enterprise Linux are ANTLR 2.7.7, and antlr3 is ANTLR 3.5.3 — neither major version contains a Go code-generation target or the GoTarget class. The only ANTLR4 present is the antlr4 4.8.0 JavaScript runtime bundled in Grafana, which is the parser runtime library, not the code-generation tool. The Go toolchain (gofmt) is not itself vulnerable; it is merely invoked by the ANTLR4 generator. Consequently, no Red Hat product is affected by this flaw.
Mitigation
No mitigation is required. Red Hat products are not affected by this vulnerability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.3 | N/A | 5.3 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RC:R
Understanding the Weakness (CWE)
Confidentiality,Integrity,Availability,Non-Repudiation
Technical Impact: Execute Unauthorized Code or Commands; DoS: Crash, Exit, or Restart; Read Files or Directories; Modify Files or Directories; Read Application Data; Modify Application Data; Hide Activities
Attackers could execute unauthorized operating system commands, which could then be used to disable the product, or read and modify data for which the attacker does not have permissions to access directly. Since the targeted application is directly executing the commands instead of the attacker, any malicious activities may appear to come from the application or the application's owner.
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
