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CVE-2026-117939 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:4.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

CNA: CISA-ADPCVSS-B:6.3 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://bugzilla.mozilla.org/show_bug.cgi?id=2082030	[email protected]	Issue TrackingPermission RequiredVendor
https://www.mozilla.org/security/advisories/mfsa2026-118/	[email protected]	AdvisoryBundleRemedyVendor
https://www.mozilla.org/security/advisories/mfsa2026-119/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-120/	[email protected]	AdvisoryBundleVendor
https://www.mozilla.org/security/advisories/mfsa2026-121/	[email protected]
https://www.mozilla.org/security/advisories/mfsa2026-122/	[email protected]

see all 6 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-416	Use After Free	CISA-ADP

Affected Products

Product	Versions
Mozilla Firefox	All versions
CPE cpe:2.3:a:mozilla:firefox:::::::: Remediation Upgrade: 159moderate effort
Mozilla Firefox ESR	All versions
CPE cpe:2.3:a:mozilla:firefox_esr:::::::: Remediation Upgrade: 115.44moderate effort Upgrade: 153.6moderate effort

Change History

3 change records found show changes

Date	Action	Recorded By
Nov 4, 2026	CVE Modified	CISA-ADP
Oct 27, 2026	CVE Modified	[email protected]
Oct 27, 2026	New CVE Received	[email protected]