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CVE-2026-5121

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.

Credits

Red Hat would like to thank Elhanan Haenel for reporting this issue.

References

https://access.redhat.com/errata/RHSA-2026:10065
https://access.redhat.com/errata/RHSA-2026:8510
https://access.redhat.com/errata/RHSA-2026:8517
https://access.redhat.com/errata/RHSA-2026:8521
https://access.redhat.com/errata/RHSA-2026:8534
https://access.redhat.com/errata/RHSA-2026:8864
https://access.redhat.com/errata/RHSA-2026:8866
https://access.redhat.com/errata/RHSA-2026:8867
https://access.redhat.com/errata/RHSA-2026:8873
https://access.redhat.com/errata/RHSA-2026:8908
https://access.redhat.com/errata/RHSA-2026:9026
https://access.redhat.com/errata/RHSA-2026:9592
https://access.redhat.com/errata/RHSA-2026:9832
https://access.redhat.com/security/cve/CVE-2026-5121
https://bugzilla.redhat.com/show_bug.cgi?id=2452945
https://github.com/advisories/GHSA-2vwv-vqpv-v8vc
https://github.com/libarchive/libarchive/pull/2934
Published
Mar 30, 2026 07:47:28 UTC
Updated
Apr 23, 2026 06:08:26 UTC
Reserved
Mar 30, 2026 07:39:27 UTC
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