CVE-2026-41401

libyang - Heap Use-After-Free Write in XML Metadata Parsing

En bref

Sévérité: MEDIUM 6.9
EPSS: EPSS 0.67 % · centile 52 (2026-10-27)
État: PUBLISHED
Publiée: 2026-05-26
Mise à jour: 2026-05-26
Attribuée par: VulnCheck
Statut NVD: Deferred

Description

libyang before 5.2.6 contains a heap use-after-free write vulnerability in lyd_parser_set_data_flags that incorrectly updates metadata list pointers when freeing non-head default metadata entries. Attackers can trigger this vulnerability by submitting crafted YANG XML documents with specific metadata attributes to applications parsing untrusted XML data, causing process crashes or potential code execution.

Scores

Version	Score	Vecteur	Évalué par
CVSS 4.0	MEDIUM 6.9	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	VulnCheck
CVSS 4.0	HIGH 7.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X	NVD · disclosure@vulncheck.com (Secondary)
CVSS 3.1	MEDIUM 6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	NVD · disclosure@vulncheck.com (Secondary)

Faiblesses (CWE)

CWE-416

Références européennes

ENISA EUVD · EUVD-2026-31832
GCVE · GCVE-0-2026-41401

Avis du CERT-FR

CERTFR-2026-AVI-0674 — Multiples vulnérabilités dans les produits Microsoft · cert.ssi.gouv.fr

Produits affectés

Produit	Versions
libyang · libyang	affected 0 < 5.4.3 ; unaffected 5.4.3

Références

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD