What’s Vulnerable › Vulnerabilities

CVE-2026-16517: Libarchive: libarchive: signed integer overflow in archive_write_zip_header

• Severity: low (CVSS 2.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-21 · updated 2026-09-22
• Weakness: CWE-190

Description

A signed integer overflow vulnerability was found in libarchive's ZIP writer. In the archive_write_zip_header function in archive_write_set_format_zip.c, when ZIP encryption is enabled and the entry file size is close to INT64_MAX, the addition of the encryption overhead to the entry size overflows int64_t, resulting in undefined behavior. This could lead to incorrect Zip64 extension decisions or potential memory corruption.

Affected products

• Red Hat OpenShift Container Platform 4.18: all versions
• Red Hat Enterprise Linux 10: all versions — fixed in 0:3.7.7-11.el10_2
• Red Hat Enterprise Linux 6: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Hardened Images: all versions — fixed in 3.8.8-3.1.hum1

How to fix

Upgrade to a fixed version: Red Hat Enterprise Linux 10 0:3.7.7-11.el10_2; Red Hat Hardened Images 3.8.8-3.1.hum1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:43818
• https://access.redhat.com/errata/RHSA-2026:69553
• https://access.redhat.com/security/cve/CVE-2026-16517
• https://bugzilla.redhat.com/show_bug.cgi?id=2505492

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