CVE-2026-10174: Aider 0.86.3 Pre-commit Hook Bypass Vulnerability

Technical summary

CVE-2026-10174 affects the Pre-commit Hook Handler component in aider/args.py. The vulnerability stems from improper validation of the git-commit-verify argument, classified under CWE-693 (Protection Mechanism Failure). When an authenticated user manipulates this argument, the pre-commit hook verification logic can be circumvented, potentially allowing unintended code commits to proceed. The flaw is remotely exploitable via network access and requires low complexity to trigger once an attacker has authenticated to the system. Public proof-of-concept code is already available.

Business impact

For organizations and teams relying on Aider for code integration and automation, this vulnerability could allow authenticated users to bypass commit verification controls. In development pipelines, this means malicious or non-compliant code could bypass safeguards intended to enforce quality or security standards. The impact is contained to integrity and confidentiality within a single system scope, but undermines the reliability of automated code protection workflows. Teams treating Aider as a trusted security boundary in their CI/CD pipeline should consider this a control weakness requiring immediate attention.

Affected systems

Aider version 0.86.3 is confirmed affected. Users of Aider for pre-commit hooks and automated code commit workflows are directly at risk. The vulnerability requires authenticated network access, so it primarily impacts shared development environments, CI/CD systems where Aider is deployed, or scenarios where Aider is exposed to multiple users or untrusted network segments.

Exploitability

The vulnerability scores as CVSS 6.3 (MEDIUM) with a network attack vector, low complexity, and requirements for prior authentication. The availability of public exploit code lowers the barrier to exploitation. However, an attacker must already possess valid credentials to the system, which contains the practical risk to insider threats or compromised developer accounts. The straightforward nature of the attack (argument manipulation) means skilled attackers can weaponize this quickly once authenticated.

Remediation

Users should immediately update Aider beyond version 0.86.3 to a patched release. Verify against the Aider-AI project's official advisory and release notes for the specific version addressing this flaw. In the interim, restrict network access to systems running Aider to trusted users and networks only. Review and strengthen authentication controls for accounts with access to systems running Aider, and monitor pre-commit hook execution logs for suspicious argument patterns or bypass attempts.

Patch guidance

Check the Aider-AI GitHub repository and official release channels for a patched version superseding 0.86.3. Apply patches as soon as available through your package manager or container registry. Given the public availability of exploit code, treat this as a high-priority update candidate. Before deploying, validate that the patched version does not break existing pre-commit configurations in your environment by testing in a staging pipeline first.

Detection guidance

Monitor aider/args.py execution logs and pre-commit hook invocations for unexpected or suspicious git-commit-verify argument values. Look for authentication logs showing access from unexpected sources to systems running Aider. Inspect version inventories to identify all systems still running 0.86.3. Consider adding argument validation rules to your logging and detection systems to flag anomalous pre-commit invocations. If SIEM or log aggregation is in place, create detection rules for bypass attempts targeting commit verification.

Why prioritize this

Although the CVSS score is moderate (6.3), the combination of public exploit availability, authenticated network exploitability, and the integrity risk to code pipelines warrants prioritization. Development and CI/CD teams should treat this as a near-term remediation target. The lack of vendor response at the time of publication suggests users cannot rely on immediate vendor patch delivery, increasing the need for proactive defense and monitoring.

Risk score, explained

The CVSS 6.3 (MEDIUM) rating reflects the network attack vector and low attack complexity, balanced by the requirement for prior authentication (PR:L) and contained scope of impact (integrity and confidentiality on the affected system only). The score does not yet account for public exploit availability or the criticality of code pipeline integrity to most organizations; risk prioritization should factor in your environment's reliance on Aider as a security control.

Frequently asked questions