No exploitation reportedFix available

CVE-2026-5121

No exploitation reported by the sources we read.

Published2026-03-30
WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC

2026-03-3008:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-5121?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-5121?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
6.0	= 6.0	no fix published	NVD
7.0	= 7.0	no fix published	NVD
8.0	= 8.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD
10.0	= 10.0	no fix published	NVD

Libarchive

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

Redhat hardened images

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

RHSA-2026:82888 Red Hat Product Security1 product fixed
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2
RHSA-2026:82857 Red Hat Product Security1 product fixed
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2
RHSA-2026:72502 Red Hat Product Security4 products fixed
Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.20.1
RHSA-2026:14937 Red Hat Product Security2 products fixed
Red Hat Security Advisory: A Subscription Management tool for finding and reporting Red Hat product usage
RHSA-2026:11768 Red Hat Product Security3 products fixed
Red Hat Security Advisory: Red Hat Update Infrastructure 5.2 Technology Preview security update
RHSA-2026:10065 Red Hat Product Security4 products fixed
Red Hat Security Advisory: Red Hat Update Infrastructure 5.1 security update

Full record on NVD

Fix

Vendor fix Red Hat Product Security RHSA-2026:82888 · 1 productBefore applying this update, make sure all previously released errata relevant to your system have been applied. The steps to apply the upgraded images are different depending on the installation plan approval policy you used when installing the cert-manager Operator for Red Hat OpenShift. - If t…
Vendor fix Red Hat Product Security RHSA-2026:14937 · 2 productsThe containers required to run Discovery can be installed through discovery-installer RPM. See the official documentation for more details.
Vendor fix Red Hat Product Security RHSA-2026:11768 · 3 productsPlease consult the RHUI Technology Preview Release Notes at https://access.redhat.com/articles/7141172 for instructions on how to use this image set.
Vendor fix Red Hat Product Security RHSA-2026:10065 · 4 productsThe container images provided by this release, apart from the installer, should be deployed using rhui-installer utility. See the official documentation for more details.
Workaround from the vendor Red Hat Product Security RHSA-2026:82888 · 1 productTo mitigate this issue, avoid processing untrusted ISO9660 images with applications that utilize `libarchive`. Users should only extract or read content from ISO images obtained from trusted sources.

Advisories and patches

github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVE recordread 2026-10-23
CISA-ADPSSVC decisionnone2026-03-31
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.19.82026-03-31
CNACVSS 3.17.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-1902026-03-31
CNAweakness (CWE)CWE-190read 2026-10-23
FIRST EPSSEPSS score1.4 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: 2026-03-30
Last Modified: 2026-10-14
NVD status: Modified

Frequently asked questions

What is CVE-2026-5121?

Is CVE-2026-5121 actively exploited?

Active exploitation of CVE-2026-5121 has not been confirmed. Its EPSS score was 1.4% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-5121?

CVE-2026-5121 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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