VulnerabilityModified

CVE-2026-5121

On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic.

HIGH 7.5EPSS 1.07%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.07%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

Description

A flaw was found in libarchive. On 32-bit systems, an integer overflow vulnerability exists in the zisofs block pointer allocation logic. A remote attacker can exploit this by providing a specially crafted ISO9660 image, which can lead to a heap buffer overflow. This could potentially allow for arbitrary code execution on the affected system.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
EPSS: 1.07% probability · 65th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-190
Affected: libarchive/libarchive · redhat/hardened images · redhat/openshift container platform · redhat/enterprise linux
Source: secalert@redhat.com

EPSS trend

EPSS 1.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.