Memory safety bugs fixed in Firefox ESR 140.13 and Firefox 153

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Summary

CVECVE-2026-16412
StatePUBLISHED
Assignermozilla
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-21 13:17:16 UTC
Updated2026-07-21 20:17:00 UTC
DescriptionMemory safety bugs present in Firefox ESR 140.12 and Firefox 152. 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 153 and Firefox ESR 140.13.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from ADP

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

Problem Types: CWE-119 | CWE-119 CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mozilla Firefox unaffected 140.13 140.* rpm Not specified
CNA Mozilla Firefox unaffected 153 * rpm Not specified

References

ReferenceSourceLinkTags
bugzilla.mozilla.org/buglist.cgi [email protected] bugzilla.mozilla.org
bugzilla.mozilla.org/buglist.cgi [email protected] bugzilla.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-70 [email protected] www.mozilla.org
bugzilla.mozilla.org/buglist.cgi [email protected] bugzilla.mozilla.org
www.mozilla.org/security/advisories/mfsa2026-68 [email protected] www.mozilla.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Christian Holler, Frederik Braun, Justin Link, Simon Friedberger, Tom Ritter, Tom Schuster and the Mozilla Fuzzing Team (en)

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