CVE-2026-56876 max-mapper CVE debrief

Who should care

Developers and users of the extract-zip library should be aware of this vulnerability. Applications that use extract-zip to process untrusted zip files are potentially affected. Users should prioritize updating to a patched version of extract-zip. Security teams should review their inventory of affected systems and monitor for potential exploitation attempts.

Technical summary

The extract-zip library does not validate symlink targets when extracting zip archives. A malicious zip file can contain a symlink with a relative path, such as '../../../../etc/passwd', which can point outside the extraction directory. This allows an attacker to potentially read or write to arbitrary files, depending on how extract-zip is used. The vulnerability has a CVSS score of 8.6 and is classified as HIGH severity. Limited evidence is available, and further analysis is needed to fully understand the vulnerability's impact.

Defensive priority

This vulnerability should be prioritized for remediation due to its HIGH severity and potential for arbitrary file access. Affected systems should be identified and patched as soon as possible.

Recommended defensive actions

• Update to a patched version of extract-zip
• Review and update affected applications that use extract-zip
• Monitor for potential exploitation attempts
• Perform a thorough inventory of systems that use extract-zip
• Consider implementing additional security controls for zip file processing

Evidence notes

The CVE record and NVD detail provide official information about the vulnerability. Additional references from GitHub and CSAF offer further context. However, evidence is limited, and further analysis is required to fully understand the impact and scope of this vulnerability.

Official resources