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NVD / CVE Program· CNA redhat

CVE-2026-0990: Libxml2: libxml2: denial of service via uncontrolled recursion in xml catalog processing

Noroxi assessment

Priority: Monitor (action score 23/100)

  • 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: 0.95% (FIRST EPSS); higher than 61.4% 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. Special conditions such as timing or configuration are required.
  • Fixed version: azl3 libxml2 2.11.5-8 on Azure Linux 3.0 2.11.5-9; azl3 libxml2 2.11.5-9 on Azure Linux 3.0 2.11.5-9; cbl2 libxml2 2.10.4-10 on CBL Mariner 2.0 2.10.4-10.

Low priority for now. Upgrade to azl3 libxml2 2.11.5-8 on Azure Linux 3.0 2.11.5-9; azl3 libxml2 2.11.5-9 on Azure Linux 3.0 2.11.5-9; cbl2 libxml2 2.10.4-10 on CBL Mariner 2.0 2.10.4-10 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 libxml2, an XML parsing library. This uncontrolled recursion vulnerability occurs in the xmlCatalogXMLResolveURI function when an XML catalog contains a delegate URI entry that references itself. A remote attacker could exploit this configuration-dependent issue by providing a specially crafted XML catalog, leading to infinite recursion and call stack exhaustion. This ultimately results in a segmentation fault, causing a Denial of Service (DoS) by crashing affected applications.

MediumCVSS 5.9 · v3.1—No exploit Fix available
Published
Jan 15, 2026
Updated
Sep 1, 2026
EPSS
0.9% · 61th percentile

Report tools

JSON

Action score

23

Monitor

Low priority for now.

CVSS
23 / 40 · 5.9 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
5.9
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.

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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
redhathardened images
redhatjboss core services
redhatopenshift container platform
redhatenterprise linux
ibmvios
ibmaix
xmlsoftlibxml2

Affected versions

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

  • ibm aix7.3.2 and later · before 7.3.3.3
  • ibm aix7.2.5 and later · before 7.2.5.12
  • ibm aix7.3.4
  • ibm vios4.1.0 and later · before 4.1.1.30
  • ibm vios4.1.2.0
  • 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 jboss core servicesall versions
  • redhat openshift container platform4.0
  • xmlsoft libxml2before 2.15.2

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 Red Hat Enterprise Linux 10

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsaffected

  • Red Hat Red Hat Hardened Images

    • 2.15.2-0.3.hum1 and laternot affected · rpm

  • Red Hat Red Hat JBoss Core Services

    • all versionsaffected

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsaffected
    • all versionsaffected

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12libxml2before 2.9.14+dfsg-1.3~deb12u62.9.14+dfsg-1.3~deb12u6
Debian:13libxml2before 2.12.7+dfsg+really2.9.14-2.1+deb13u32.12.7+dfsg+really2.9.14-2.1+deb13u3
Debian:14libxml2before 2.15.2+dfsg-0.12.15.2+dfsg-0.1
openSUSE:Leap 15.6libxml2before 2.10.3-150500.5.38.12.10.3-150500.5.38.1
openSUSE:Leap 15.6libxml2-pythonbefore 2.10.3-150500.5.38.12.10.3-150500.5.38.1
openSUSE:Leap 15.6python-libxml2-pythonbefore 2.9.7-150000.3.94.12.9.7-150000.3.94.1
openSUSE:Leap 16.0libxml2before 2.13.8-160000.4.12.13.8-160000.4.1
openSUSE:Leap 16.0libxml2-pythonbefore 2.13.8-160000.4.12.13.8-160000.4.1
openSUSE:Leap 16.0libxsltbefore 1.1.43-160000.4.11.1.43-160000.4.1
openSUSE:Tumbleweedlibxml2before 2.14.5-4.12.14.5-4.1
Red Hat:hummingbird:1libxml2before 0:2.15.2-0.3.hum10:2.15.2-0.3.hum1
Red Hat:hummingbird:1libxml2-16before 0:2.15.2-0.3.hum10:2.15.2-0.3.hum1
Red Hat:hummingbird:1libxml2-develbefore 0:2.15.2-0.3.hum10:2.15.2-0.3.hum1
Red Hat:hummingbird:1libxml2-staticbefore 0:2.15.2-0.3.hum10:2.15.2-0.3.hum1
Red Hat:hummingbird:1python3-libxml2before 0:2.15.2-0.3.hum10:2.15.2-0.3.hum1
SUSE:Linux Enterprise Micro 5.2libxml2before 2.9.7-150000.3.94.12.9.7-150000.3.94.1
SUSE:Linux Enterprise Micro 5.2python-libxml2-pythonbefore 2.9.7-150000.3.94.12.9.7-150000.3.94.1
SUSE:Linux Enterprise Micro 5.3libxml2before 2.9.14-150400.5.55.12.9.14-150400.5.55.1
SUSE:Linux Enterprise Micro 5.3libxml2-pythonbefore 2.9.14-150400.5.55.12.9.14-150400.5.55.1
SUSE:Linux Enterprise Micro 5.5libxml2before 2.10.3-150500.5.38.12.10.3-150500.5.38.1
SUSE:Linux Enterprise Micro 5.5libxml2-pythonbefore 2.10.3-150500.5.38.12.10.3-150500.5.38.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libxml2before 2.12.10-150700.4.11.12.12.10-150700.4.11.1
SUSE:Linux Enterprise Module for Basesystem 15 SP7libxml2-pythonbefore 2.12.10-150700.4.11.12.12.10-150700.4.11.1
SUSE:Linux Enterprise Server 16.0libxml2before 2.13.8-160000.4.12.13.8-160000.4.1

+10

Same product

redhat: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-71226Libkcapi: memory corruption via uncanceled aio requests on error in libkcapi's one-shot aio path
    29Monitor
  • CVE-2026-71225Libkcapi: iv reuse in libkcapi one-shot symmetric cipher chunking causes cipher state reset across chunk boundaries
    26Monitor
  • CVE-2026-13757P11-kit: stack exhaustion via unbounded recursion in rpc attribute parsing
    24Monitor

Published before and after this one in the same product

  • Later →CVE-2026-0992Jan 15, 2026 · Libxml2: libxml2: denial of service via crafted xml catalogs
    11Monitor
  • Later →CVE-2026-2625Apr 3, 2026 · Rust-rpm-sequoia: rust-rpm-sequoia: denial of service via crafted rpm file during signature verification
    22Monitor
  • Later →CVE-2026-13595Jun 29, 2026 · Util-linux: util-linux: heap use-after-free in libblkid nested partition probing
    21Monitor

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 libxml2 2.11.5-8 on Azure Linux 3.02.11.5-9 · CBL-Mariner ReleasesMicrosoft (MSRC)
azl3 libxml2 2.11.5-9 on Azure Linux 3.02.11.5-9 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 libxml2 2.10.4-10 on CBL Mariner 2.02.10.4-10 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:libxml22.9.14+dfsg-1.3~deb12u6 · Debian:12Package registry (OSV)
opensuse:libxml22.10.3-150500.5.38.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:libxml2-python2.10.3-150500.5.38.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:libxslt1.1.43-160000.4.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:python-libxml2-python2.9.7-150000.3.94.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:libxml20:2.15.2-0.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libxml2-160:2.15.2-0.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libxml2-devel0:2.15.2-0.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:libxml2-static0:2.15.2-0.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:python3-libxml20:2.15.2-0.3.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:libxml22.9.7-150000.3.94.1 · SUSE:Linux Enterprise Micro 5.2Package registry (OSV)
suse:libxml2-python2.10.3-150500.5.38.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:libxslt1.1.43-160000.4.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:python-libxml22.9.4-46.99.1 · SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5Package registry (OSV)
suse:python-libxml2-python2.9.7-150000.3.94.1 · SUSE:Linux Enterprise Micro 5.2Package 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

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

No commit or PR link among the references.

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-2026-13757165 days apartP11-kit: stack exhaustion via unbounded recursion in rpc attribute parsing
    24Monitor

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

The product’s vendor appears in a public program. Matched by name; verify the scope text in the program.

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.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-674 · Uncontrolled Recursion

CVSS vector

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

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 (2 more)

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

All records