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CVE-2026-73240 – Git Argument Injection (Remote Code Execution Risk) – Apache Allura before 1.19.1

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Summary

CVE-2026-73240 is a critical git argument injection vulnerability in Apache Allura, an open-source platform for hosting software development projects (source code, tickets, wikis, forums, etc.). Specifically crafted user input can be injected as arguments into git commands executed by Allura, and the flaw carries a CVSS v3.1 base score of 9.8 (Critical). All Allura deployments running versions prior to 1.19.1 are affected and should be upgraded immediately.

Technical details

  • Root cause: Improper Neutralization of Argument Delimiters in a Command (CWE-88) — Allura fails to adequately sanitize certain user-supplied input before passing it to underlying git command invocations, allowing attacker-controlled strings to be interpreted as command-line arguments/options rather than plain data.
  • Trigger conditions: An attacker submits specifically crafted input (e.g., via repository-related operations handled by Allura) that is subsequently used to construct a git command line.
  • Attack vector: Network-based (AV:N); the CVSS vector indicates low attack complexity (AC:L), no privileges required (PR:N), and no user interaction (UI:N) — meaning an unauthenticated, remote attacker can potentially exploit the issue.
  • Impact: High impact to confidentiality, integrity, and availability (C:H/I:H/A:H). Successful argument injection against git commands can lead to unauthorized data disclosure, manipulation of repository content, or disruption of the affected service, depending on which git operation is abused.
  • This flaw was addressed alongside several other vulnerabilities in the same Apache Allura release (including CVE-2026-69223, CVE-2026-73237, CVE-2026-73238, and CVE-2026-73239), reflecting broader security hardening work in that version.

Affected software

  • Apache Allura: all versions prior to 1.19.1

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Upgrade all Apache Allura deployments to version 1.19.1 or later, which contains the fix for this vulnerability.
  • If immediate patching is not possible: Restrict network exposure of the Allura instance (e.g., place it behind authentication/VPN or limit access to trusted networks) to reduce the risk of unauthenticated remote exploitation until the upgrade can be applied. Review the Apache Allura 1.19.1 release notes, as the upgrade also requires configuration and database migration steps (e.g., running migration scripts and reindexing), so plan and test the upgrade in a staging environment before applying it in production.

References

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