HighVulnerabilityLLM-specific

CVE-2026-109331: Network-AI security control bypass in ClaudeHookBridge PreToolUse hook

Source: NVD(opens in a new tab)
Identifier: CVE-2026-109331
Published: October 12, 2026
Record updated: October 12, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

Network-AI versions from 5.14.0 before 5.15.2 contain a security control bypass in the ClaudeHookBridge PreToolUse hook. The hook matches denyPatterns only against the first present candidate field, so a prompt-injected agent can place dangerous payloads in fields such as Write content or an MCP script parameter alongside a benign file_path or command, evading the deny rules to write web shells or execute scripts.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.4(high)
CVSS vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector: local
Attack complexity: high
Privileges required: none
User interaction: none
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 12, 2026.
Disclosure date: October 12, 2026

Weaknesses and techniques

Weakness (CWE): CWE-436
AI threat technique (MITRE ATLAS): AML.T0051

Classification

Attack type: Prompt injection,
Other
Attack sophistication: Moderate
AI component targeted: Agent
Impact: Integrity,
Confidentiality
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-109331

First tracked: October 12, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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