Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (Mozilla Firefox)

CVE-2026-4721

CRITICAL 9.8

En bref

Source: NVD
EPSS: EPSS 0.44 % · centile 38 (2026-10-31)
État: PUBLISHED
Publiée: 2026-03-24 12:30 UTC
Mise à jour: 2026-07-15 00:49 UTC
Attribuée par: mozilla
Statut NVD: Modified

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Description

Memory safety bugs present in Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird ESR 140.8, Firefox 148 and Thunderbird 148. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Faiblesses (CWE)

CWE-120 — Copie de tampon sans vérification de taille (débordement classique)
CWE-825 — Expired Pointer Dereference

Références

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	redhat-SADP
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Références européennes

ENISA EUVD · EUVD-2026-14857
GCVE · GCVE-0-2026-4721

Avis du CERT-FR

CERTFR-2026-AVI-0354 — Multiples vulnérabilités dans les produits Mozilla · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* < 115.34.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* < 149.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* ≥ 128.0 < 140.9.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:* < 140.9.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:* < 149.0

Produits affectés

Produit	Versions
Mozilla · Firefox	unaffected 115.34 ≤ 115.* ; unaffected 140.9 ≤ 140.* ; unaffected 149 ≤ *
Mozilla · Thunderbird	unaffected 140.9 ≤ 140.* ; unaffected 149 ≤ *

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

💣 Memory safety bugs fixed in Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149 (Mozilla Firefox)