EUVD-2026-57818
GHSA-64vj-7c55-24w2
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AV:N and PR:L reflect network-submitted commands requiring low-privilege bridge access; S:U consistent with no subsequent-system scope change per CVSS 4.0 SC:N.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
3DescriptionCVE.org
Network-AI ClaudeHookBridge before 5.15.1 truncates the target string to 500 characters before evaluating denyPatterns, while Claude Code executes the full untruncated command. Attackers can position dangerous content past byte 500 in a Bash command field to bypass the operator's hard-deny list and execute arbitrary commands.
AnalysisAI
Truncation-induced interpretation conflict in Network-AI ClaudeHookBridge before 5.15.1 enables low-privileged attackers to bypass operator-configured denyPatterns and achieve arbitrary command execution. The bridge evaluates security patterns against only the first 500 characters of a submitted Bash command field while Claude Code receives and executes the full, untruncated string - meaning any payload positioned past byte 500 is invisible to the deny list but fully executable by the runtime. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires low-privilege access (PR:L per the CVSS 4.0 vector) sufficient to submit Bash command fields through the ClaudeHookBridge interface - unauthenticated external attackers cannot exploit this directly. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H) accurately characterizes a network-reachable, low-complexity bypass that produces full-impact RCE on the vulnerable system; the SC:N/SI:N/SA:N metrics indicate no additional subsequent-system scope change is modeled. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privilege access to the ClaudeHookBridge submission interface crafts a Bash command string where 500 characters of benign-looking content precede a malicious payload - such as a reverse shell invocation or credential exfiltration command - appended at byte 501 and beyond. When submitted, the bridge evaluates only the innocuous prefix against the operator's denyPatterns, finds no violation, and permits execution; Claude Code then runs the complete string, triggering the hidden payload. … |
| Remediation | Upgrade Network-AI to version 5.15.1 or later, which resolves the truncation-before-evaluation flaw per the vendor's GitHub Security Advisory GHSA-743h-jr5x-mpcr (https://github.com/Jovancoding/Network-AI/security/advisories/GHSA-743h-jr5x-mpcr). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all ClaudeHookBridge deployments in production and document current versions. …
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External POC / Exploit Code
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