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NVD / CVE Program· CNA redhat

CVE-2026-5121: Libarchive: libarchive: arbitrary code execution via integer overflow in iso9660 image processing

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 64.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: azl3 libarchive 3.7.7-5 on Azure Linux 3.0 3.7.7-6; cbl2 libarchive 3.6.1-9 on CBL Mariner 2.0 3.6.1-10; cbl2 libarchive 3.6.1-9 on CBL-Mariner 2.0 3.6.1-10.

Low priority for now. Upgrade to azl3 libarchive 3.7.7-5 on Azure Linux 3.0 3.7.7-6; cbl2 libarchive 3.6.1-9 on CBL Mariner 2.0 3.6.1-10; cbl2 libarchive 3.6.1-9 on CBL-Mariner 2.0 3.6.1-10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Mar 30, 2026
Updated
Oct 14, 2026
EPSS
1.0% · 64th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-5121

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
libarchivelibarchive
redhathardened images
redhatopenshift container platform
redhatenterprise linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • libarchive libarchiveall versions
  • redhat enterprise linux10.0
  • redhat enterprise linux6.0
  • redhat enterprise linux7.0
  • redhat enterprise linux8.0
  • redhat enterprise linux9.0
  • redhat hardened imagesall versions
  • redhat openshift container platform4.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17

    • 1791371080 and laternot affected · rpm
    • 1791371069 and laternot affected · rpm
    • 1791788287 and laternot affected · rpm
    • 1791970484 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18

    • 1791459707 and laternot affected · rpm
    • 1791459711 and laternot affected · rpm
    • 1791459759 and laternot affected · rpm
    • 1789029076 and laternot affected · rpm
    • 1791966259 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20

    • 1790598593 and laternot affected · rpm

  • Red Hat Red Hat AI Inference Server 3.2

    • 1779223654 and laternot affected · rpm
    • 1779223651 and laternot affected · rpm
    • 1780681984 and laternot affected · rpm

  • Red Hat Red Hat AI Inference Server 3.3

    • 1778244559 and laternot affected · rpm
    • 1778244531 and laternot affected · rpm
    • 1778274666 and laternot affected · rpm
    • 1778244546 and laternot affected · rpm

  • Red Hat Red Hat Discovery 2

    • 1778156756 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:3.1.2-14.el7_9.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 0:3.3.3-7.el8_10 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

    • 0:3.3.2-8.el8_2.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:3.3.3-1.el8_4.2 and laternot affected · rpm

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8bsdtarbefore 3.3.3-7.el8_103.3.3-7.el8_10
AlmaLinux:8libarchivebefore 3.3.3-7.el8_103.3.3-7.el8_10
AlmaLinux:8libarchive-develbefore 3.3.3-7.el8_103.3.3-7.el8_10
AlmaLinux:9bsdtarbefore 3.5.3-9.el9_73.5.3-9.el9_7
AlmaLinux:9libarchivebefore 3.5.3-9.el9_73.5.3-9.el9_7
AlmaLinux:9libarchive-develbefore 3.5.3-9.el9_73.5.3-9.el9_7
Debian:12libarchivebefore 3.6.2-1+deb12u43.6.2-1+deb12u4
Debian:13libarchivebefore 3.7.4-4+deb13u13.7.4-4+deb13u1
Debian:14libarchivebefore 3.8.7-13.8.7-1
Red Hat:enterprise_linux:8::baseosbsdcat-debuginfobefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::baseosbsdcpio-debuginfobefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::baseosbsdtarbefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::baseosbsdtar-debuginfobefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::baseoslibarchivebefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::baseoslibarchive-debuginfobefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::baseoslibarchive-debugsourcebefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:8::crblibarchive-develbefore 0:3.3.3-7.el8_100:3.3.3-7.el8_10
Red Hat:enterprise_linux:9::appstreambsdcat-debuginfobefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7
Red Hat:enterprise_linux:9::appstreambsdcpio-debuginfobefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7
Red Hat:enterprise_linux:9::appstreambsdtarbefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7
Red Hat:enterprise_linux:9::appstreambsdtar-debuginfobefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7
Red Hat:enterprise_linux:9::appstreamlibarchive-debuginfobefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7
Red Hat:enterprise_linux:9::appstreamlibarchive-debugsourcebefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7
Red Hat:enterprise_linux:9::appstreamlibarchive-develbefore 0:3.5.3-9.el9_70:3.5.3-9.el9_7

+73

Same product

libarchive: all records

Other highest-scoring records for the same primary product.

  • CVE-2024-26256Libarchive Remote Code Execution Vulnerability
    57Plan
  • CVE-2022-36227In libarchive before 3.6.2, the software does not check for an error after calling calloc function that can return with a NULL pointer if th
    40Plan
  • CVE-2016-1541Heap-based buffer overflow in the zip_read_mac_metadata function in archive_read_support_format_zip.c in libarchive before 3.2.0 allows remo
    38Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-4426Mar 19, 2026 · Libarchive: libarchive: denial of service via malformed iso file processing
    26Monitor
  • ← EarlierCVE-2026-4424Mar 19, 2026 · Libarchive: libarchive: information disclosure via heap out-of-bounds read in rar archive processing
    30Monitor
  • Later →CVE-2026-5745Apr 7, 2026 · Libarchive: a null pointer dereference vulnerability exists in the acl parser of libarchive
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 libarchive 3.7.7-5 on Azure Linux 3.03.7.7-6 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libarchive 3.6.1-9 on CBL Mariner 2.03.6.1-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libarchive 3.6.1-9 on CBL-Mariner 2.03.6.1-10 · Release NotesMicrosoft (MSRC)
almalinux:bsdtar3.5.3-9.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:libarchive3.5.3-9.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:libarchive-devel3.5.3-9.el9_7 · AlmaLinux:9Package registry (OSV)
debian:libarchive3.6.2-1+deb12u4 · Debian:12Package registry (OSV)
red hat:bsdcat0:3.8.7-1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:bsdcat-debuginfo0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:bsdcpio0:3.1.2-14.el7_9.2 · Red Hat:rhel_els:7Package registry (OSV)
red hat:bsdcpio-debuginfo0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:bsdtar0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:bsdtar-debuginfo0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libarchive0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::baseosPackage registry (OSV)
red hat:libarchive-debuginfo0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libarchive-debugsource0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:libarchive-devel0:3.5.3-9.el9_7 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:libarchive0:3.5.3-9.el9_7 · Rocky Linux:9Package registry (OSV)
suse:libarchive3.6.2-6.1 · SUSE:Linux Micro 6.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2025-5914294 days apartLibarchive: double free at archive_read_format_rar_seek_data() in archive_read_support_format_rar.c
    31Monitor
  • CVE-2025-5916294 days apartLibarchive: integer overflow while reading warc files at archive_read_support_format_warc.c
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-190 · Integer Overflow or Wraparound

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records