CVE-2026-86143

highpriority · track · 29EPSS 0.002 · 9 %ileDEUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.19% (9th) EPSS

CVSS 7.3 · high

Is it mine?

9 products

Check your exposure

Who says so?

2 sources

cert_bund · nvd

EPSS · scored 2026-10-22

In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.

cvss

Technical severity, 0–10. One row per scoring source.

7.3

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.7–7.3

v3.17.3highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Lprimary · NVD / NIST USexploitability 1.8 · impact 5.5

v3.16.9mediumCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Lsecondary · cve@mitre.org USexploitability 1.4 · impact 5.5

v3.16.7mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-192US

affected products (9)

Products and version ranges known to be affected.

Amazon Linux 2all versionscert_bundDEcpe:/o:amazon:linux_2:-
IBM MQ Operatorall versionscert_bundDEcpe:/a:ibm:mq:operator
Oracle Linuxall versionscert_bundDEcpe:/o:oracle:linux:-
RESF Rocky Linuxall versionscert_bundDEcpe:/o:resf:rocky_linux:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Ubuntu Linuxall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:-
Open Source Open Source libxml2 <2.15.4< 2.15.4cert_bundDE
Open Source libxml2< 2.15.4cert_bundDE
xmlsoft libxml2< 2.15.4nvdUScpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*

advisories (2)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2026-3195libxml2: Mehrere SchwachstellenDeutsch2026-09-06csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in libxml2 ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um Daten zu manipulieren oder offenzulegen und um einen Denial of Service herbeizuführen.
WID-SEC-W-2026-3642Meinberg LANTIME: Mehrere SchwachstellenDeutsch2026-09-29csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Meinberg LANTIME ausnutzen, um beliebigen Code auszuführen, Sicherheitsmaßnahmen zu umgehen, Daten offenzulegen oder zu manipulieren, Denial-of-Service-Zustände herbeizuführen, sowie weitere, nicht näher spezifizierte Angriffe zu starten.

sources

Which sources assert this record, and when.

cert_bund nvd NVD CVE.org MITRE

published 2026-09-05modified 2026-09-15

references (3) nvd

External citations — patches, advisories, analysis.

https://github.com/GNOME/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35Patch
https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4Release Notes
https://gitlab.gnome.org/GNOME/libxml2/-/work_items/1111ExploitVendor Advisory

scry

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