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CVE-2026-8090

Use-after-free in the DOM: Networking component

HIGH
7.3
CVSS Score
Published: May 7, 2026 at 12:45 PM UTC
Updated: October 26, 2026 at 09:10 PM UTC
3 products affected across 2 vendorsFirefoxThunderbirdEnterprise Linux

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Severity
HIGH7.3
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

Description

Use-after-free in the DOM: Networking component. This vulnerability was fixed in Firefox 150.0.2, Firefox ESR 140.10.2, and Firefox ESR 115.35.2.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox· Mozilla
95%
v < 115.35.2v < 150.0.2128.0 ≤ v < 140.10.2
Vendor states this is fixed in 115.35.2 (unaffected)
Vendor states this is fixed in 140.10.2 (unaffected)
Vendor states this is fixed in 150.0.2 (unaffected)
Thunderbird· Mozilla
95%
v < 140.10.2v < 150.0.2
Vendor states this is fixed in 140.10.2 (unaffected)
Vendor states this is fixed in 150.0.2 (unaffected)
Enterprise Linux· Red Hatrpm
60%
10
Vendor states this is fixed in 0:140.10.2-1.el10_0 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el10_2 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el7_9 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el8_10 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el8_4 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el8_6 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el8_8 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el9_2 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el9_4 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el9_6 (unaffected)
Vendor states this is fixed in 0:140.10.2-1.el9_8 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el10_0 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el10_2 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el8_10 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el8_4 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el8_6 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el8_8 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el9_2 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el9_4 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el9_6 (unaffected)
Vendor states this is fixed in 0:140.11.0-1.el9_8 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)

References (30)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2034352
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-40/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-41/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-42/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-43/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-44/
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:19160
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:20566

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.3HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-416CWE-825

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