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Fencer Vulns
medium 6.2

CVE-2026-1757 json

Libxml2: memory leak leading to local denial of service in xmllint interactive shell

published 2026-02-02 9 mo ago modified 2026-11-06 3 d ago also EUVD-2026-5101

cvss
6.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 12%
public exploits
0
none known

Summary

A flaw was identified in the interactive shell of the xmllint utility, part of the libxml2 project, where memory allocated for user input is not properly released under certain conditions. When a user submits input consisting only of whitespace, the program skips command execution but fails to free the allocated buffer. Repeating this action causes memory to continuously accumulate. Over time, this can exhaust system memory and terminate the xmllint process, creating a denial-of-service condition on the local system.

Patch / fix

  • Red Hat Red Hat Hardened Images 2.15.2-0.3.hum1
  • libxml2 Debian 12 2.9.14+dfsg-1.3~deb12u6
  • libxml2 Debian 13 2.12.7+dfsg+really2.9.14-2.1+deb13u3
  • libxml2 Debian 14 2.15.2+dfsg-0.1

debian advisories DEBIAN-CVE-2026-1757

  • libxml2 Ubuntu 25.10 2.14.5+dfsg-0.2ubuntu0.2

ubuntu advisories UBUNTU-CVE-2026-1757

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libxml2 hummingbird 1 2.15.2-0.3.hum1
  • libxml2-16 hummingbird 1 2.15.2-0.3.hum1
  • python3-libxml2 hummingbird 1 2.15.2-0.3.hum1

red hat advisories RHSA-2026:7519

  • libxml2 Linux Micro 6.0 2.11.6-12.1
  • libxslt Linux Micro 6.0 1.1.38-8.1
  • libxml2-python Linux Micro 6.0 2.11.6-12.1
  • libxml2 Linux Micro 6.1 2.11.6-slfo.1.1_8.1
  • libxslt Linux Micro 6.1 1.1.38-slfo.1.1_6.1
  • libxml2-python Linux Micro 6.1 2.11.6-slfo.1.1_8.1
  • libxslt SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 1.1.43-160000.4.1
  • libxml2 SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 2.13.8-160000.4.1

suse advisories SUSE-SU-2026:20707-1SUSE-SU-2026:20657-1SUSE-SU-2026:20631-1SUSE-SU-2026:20647-1SUSE-SU-2026:0782-1SUSE-SU-2026:0606-1

  • libxslt openSUSE Leap 16.0 1.1.43-160000.4.1
  • libxml2 openSUSE Leap 16.0 2.13.8-160000.4.1
  • libxml2-python openSUSE Leap 16.0 2.13.8-160000.4.1
  • libxml2 openSUSE Tumbleweed 2.14.5-3.1

opensuse advisories openSUSE-SU-2026:20312-1openSUSE-SU-2026:10167-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-1757 updated cvss 6.2

libxml2: Memory Leak Leading to Local Denial of Service in xmllint Interactive Shell

  • Red Hat Enterprise Linux 6 libxml2, libxml2-python
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 libxml2, libxml2-python Red Hat Enterprise Linux 8 libxml2, python3-libxml2 Red Hat Enterprise Linux 9 libxml2, python3-libxml2 Red Hat Enterprise Linux 10 libxml2 Red Hat JBoss Core Services libxml2 Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    affected: workaround, no fix available “Fix deferred”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-core-bff-rhel9, rhoai/odh-dashboard-rhel9, rhoai/odh-mod-arch-maas-rhel9, rhoai/odh-mod-arch-automl-rhel9, rhoai/odh-mod-arch-gen-ai-rhel9, rhoai/odh-mod-arch-mlflow-rhel9, +6 more
    under investigation
  • Red Hat Hardened Images libxml2 2.15.2-0.3.hum1, libxml2-16 2.15.2-0.3.hum1, python3-libxml2 2.15.2-0.3.hum1
    fixed: vendor fix RHSA-2026:7519
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-mlflow-rhel9, rhoai/odh-kube-rbac-proxy-rhel9, rhoai/odh-maas-controller-rhel9, rhoai/odh-mlflow-operator-rhel9, rhoai/odh-model-controller-rhel9, rhoai/odh-ogx-k8s-operator-rhel9, +14 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.22% chance of exploitation in the next 30 days, higher than 12% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 6.2 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Hardened Images
  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat JBoss Core Services
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.