CVE-2026-109331 Jovancoding CVE debrief

Who should care

Defenders responsible for Network-AI deployments should assess exposure and prioritize patching to prevent potential security control bypass. They should verify affected Network-AI versions, review deny patterns, and assess exposure to prevent potential security control bypass. Security teams and vulnerability management teams should also prioritize verifying affected versions and applying patches.

Why it matters

CVE-2026-109331 is a security control bypass vulnerability in Network-AI versions 5.14.0 before 5.15.2. Defenders should prioritize verifying affected versions, applying patches, and reviewing deny patterns to prevent potential security control bypass.

• Verify deny pattern comprehensiveness and effectiveness
• Assess exposure of Network-AI deployments
• Prioritize patching to prevent security control bypass
• Review and update incident response plans

Technical summary

The vulnerability is located in the ClaudeHookBridge PreToolUse hook of Network-AI versions 5.14.0 before 5.15.2. The hook only matches deny patterns against the first present candidate field, allowing a prompt-injected agent to bypass deny patterns and potentially write web shells or execute scripts. This security control bypass vulnerability can be exploited by a prompt-injected agent to evade deny patterns and write web shells or execute scripts. Defenders should prioritize verifying affected versions, applying patches, and reviewing deny patterns.

Defensive priority

Defenders should prioritize verifying the affected versions of Network-AI and applying the patch to prevent potential security control bypass.

Recommended defensive actions

• Verify the version of Network-AI and check if it is affected by the vulnerability
• Apply the patch to upgrade to version 5.15.2 or later
• Review and update deny patterns to ensure they are comprehensive and effective
• Assess exposure of Network-AI deployments
• Prioritize patching to prevent security control bypass
• Review and update incident response plans
• Monitor for suspicious activity related to the vulnerability

Evidence notes

The CVE record and source item provide details about the vulnerability, but there is limited information about potential exploitation or impact. Defenders should verify affected Network-AI versions, review deny patterns, and assess exposure to prevent potential security control bypass. The ClaudeHookBridge PreToolUse hook only matches deny patterns against the first present candidate field, allowing a prompt-injected agent to bypass deny patterns. Limited evidence exists about in-the-wild exploitation or specific attacks.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.