adm-zip validation bypass via canonically equivalent ZIP entry names
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- —
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Deferred Red Hat: fix deferred
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
Summary
adm-zip through 0.6.1 contains a duplicate-entry validation bypass, tracked under CWE-436. A remote attacker who can supply a crafted ZIP archive, without privileges or user interaction, can use canonically equivalent entry names such as './hello.txt' and 'hello.txt' to evade the duplicate-entry check. The content that passes validation differs from what extractAllTo() writes to the same path, which bypasses integrity checks.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
adm-zip through 0.6.1 contains a duplicate-entry validation bypass that allows attackers to evade the readEntries() check by using canonically equivalent entry names like './hello.txt' and 'hello.txt'. Attackers can craft ZIP archives where getEntry() or readAsText() validates benign content while extractAllTo() writes malicious content to the same path, bypassing integrity checks.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
The sources list no fixed version for adm-zip. Red Hat lists the following products as affected without a fix: Cost Management On Premise, Red Hat Build of Podman Desktop, Red Hat Connectivity Link 1, Red Hat Developer Hub 1, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4, Red Hat OpenShift Container Platform 5 and Self-service automation portal 2, with no fix planned for Red Hat Advanced Cluster Management for Kubernetes 2 and Red Hat Fuse 7.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Cost Management On Premise | Affected | No fix yet: Fix deferred |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix planned: Out of support scope |
| Red Hat Build of Podman Desktop | Affected | No fix yet: Fix deferred |
| Red Hat Connectivity Link 1 | Affected | No fix yet: Fix deferred |
| Red Hat Developer Hub 1 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat Fuse 7 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift AI (RHOAI) | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
| Self-service automation portal 2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-25 Threatist record created from CVE-2026-116137
- 2026-10-25 Affected versions changed · Red Hat
- 2026-10-25 CVSS score added · Red Hat
- 2026-10-26 Priority changed: MEDIUM → LOW
- 2026-10-27 Affected versions changed · Red Hat
- 2026-10-27 Alias added: GHSA-mv5w-h6hm-qcp7
- 2026-10-29 CISA SSVC decision points changed
- 2026-10-30 Affected versions changed · Red Hat
References
Other 5
- GitHub Issue #587
- https://github.com/cthackers/adm-zip
- https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/zipFile.js#L81-L92
- https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/adm-zip.js#L87
- https://github.com/cthackers/adm-zip/blob/cb2cf9ba4c7c865db426e2de1997cb41194d9872/util/utils.js#L383
More cthackers vulnerabilities
- TI-2026-78715 Denial of service in adm-zip via unhandled error in inflateAsync CVSS 4.0HIGH 8.7
- TI-2026-53963 adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS) CVSS 3.1HIGH 7.5
- TI-2026-78716 Decompression bomb guard bypass in adm-zip exhausts memory CVSS 4.0MEDIUM 6.9
- TI-2026-78717 Duplicate ZIP entry names bypass validation in adm-zip CVSS 4.0HIGH 8.2
- TI-2026-67762 adm-zip extraction keeps setuid bits from untrusted ZIP files CVSS 3.1HIGH 7.1
- TI-2026-62130 adm-zip 0.5.14 through 0.6.0 Denial of Service via Zero Declared Uncompressed Size CVSS 4.0HIGH 8.7
Sources
- CVE-2026-116137 · CVE Program
- CVE-2026-116137 · NVD
- FIRST EPSS
- GHSA-mv5w-h6hm-qcp7 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-116137 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences