CVE-2026-4424: Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-19 · updated 2026-10-14
Weakness: CWE-125

Description

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

Affected products

libarchive: all versions
Red Hat Enterprise Linux: 6.0, 7.0, 8.0, 9.0, 10.0
RedHat Enterprise Linux Server Aus: 8.2, 8.4
RedHat Hardened Images: all versions
Red Hat OpenShift Container Platform 4.18: 4.0, 4.16
RedHat Openshift Container Platform For Arm64: 4.16
RedHat Openshift Container Platform For Power: 4.16

References

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