CVE-2026-116137 cthackers CVE debrief

Who should care

Defenders responsible for ensuring the integrity of ZIP archives and systems that use adm-zip should assess exposure and prioritize verification and remediation. This includes operators, platform administrators, vulnerability management teams, and security teams. They should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. They should also plan vendor-supported updates or mitigations through正常e

Why it matters

CVE-2026-116137 is a duplicate-entry validation bypass vulnerability in adm-zip that allows attackers to craft malicious ZIP archives. Defenders should prioritize verifying the integrity of ZIP archives and ensuring that adm-zip is updated to a version that addresses this vulnerability.

• Potential for malicious content to be written to the same path as benign content
• Bypassing of integrity checks in ZIP archives
• Verification of adm-zip version and integrity of ZIP archives is necessary

Technical summary

The vulnerability allows attackers to evade the readEntries() check by using canonically equivalent entry names like './hello.txt' and 'hello.txt'. This allows attackers to craft ZIP archives where getEntry() or readAsText() validates benign content while extractAllTo() writes malicious content to the same path, bypassing integrity checks. The vulnerability has a CVSS score of 6.3 and a severity of MEDIUM. The vulnerability is caused by a duplicate-entry validation bypass in adm-zip through 0.6.1. Defenders should prioritize verifying the integrity of ZIP archives and ensuring that adm-zip is updated to a version that addresses this vulnerability.

Defensive priority

Defenders should prioritize verifying the integrity of ZIP archives and ensuring that adm-zip is updated to a version that addresses this vulnerability.

Recommended defensive actions

• Verify the integrity of ZIP archives before processing
• Ensure that adm-zip is updated to a version that addresses this vulnerability
• Monitor for potential malicious ZIP archives
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the scope of affected versions and potential impact require further verification. The vulnerability is caused by a duplicate-entry validation bypass in adm-zip through 0.6.1. The CVE record was published on 2026-10-25T12:16:30.250Z and has not been modified since then. The NVD entry provides additional information on the vulnerability, including its CVSS score and severity.

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.