CVE-2026-85396

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.56% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 46.6% of scored records. A rank, not a probability.

NVD base score

8.7 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/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

NVD analysis status

Awaiting Analysis. NVD last modified this record on 2026-09-24.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-09-03 18:54Z1 MO AGO

Last updated

2026-09-03 19:00Z1 MO AGO

Reserved

2026-09-03

Assigning CNA

VulnCheck

Record state

PUBLISHED

Severity

High (CVSS 8.7)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Weaknesses

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')Base

Data version

5.2

Document digest

1f0023cbda18f1921d0c7099ab37286e5aaa922a8485c30a3dee01787e69e915

• github.comPatch Commithttps://github.com/rubyzip/rubyzip/commit/17edfbf4423b83211b075acc23a7d8640da63449patch
• github.comhttps://github.com/rubyzip/rubyzipproduct
• github.comrubyzip v3.4.0 Release Noteshttps://github.com/rubyzip/rubyzip/releases/tag/v3.4.0release-notes
• github.comhttps://github.com/rubyzip/rubyzip/blob/v3.3.1/lib/zip/entry.rbtechnical-description
• github.comhttps://github.com/geo-chen/oss/blob/main/rubyzip.mdtechnical-description
• www.vulncheck.comVulnCheck Advisory: rubyzip before 3.4.0 Path Traversal in Zip::Entry#extract via Sibling-Directory Prefixhttps://www.vulncheck.com/advisories/rubyzip-before-3.4.0-path-traversal-in-zip-entry-extract-via-sibling-directory-prefixthird-party-advisory