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CVE-2026-8947

Use-after-free in the DOM: Bindings (WebIDL) component

HIGH
7.3
CVSS Score
Published: May 19, 2026 at 12:29 PM UTC
Updated: October 14, 2026 at 08:10 PM UTC
3 products affected across 2 vendorsFirefoxThunderbirdEnterprise Linux

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Severity
HIGH7.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Use-after-free in the DOM: Bindings (WebIDL) component. This vulnerability was fixed in Firefox 151, Firefox ESR 115.36, and Firefox ESR 140.11.

Affected

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

Firefox· Mozilla
95%
v < 115.36.0v < 151.0.0140.0 ≤ v < 140.11.0
Vendor states this is fixed in 115.36 (unaffected)
Affected range stops below 115.36.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 140.11 (unaffected)
Affected range stops below 140.11.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 151 (unaffected)
Affected range stops below 151.0.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 140.11
Vendor states this is fixed in 140.11 (unaffected)
Vendor states this is fixed in 151 (unaffected)
Enterprise Linux· Red Hatrpm
60%
10
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.el7_9 (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=2038439
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-46/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-47/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-48/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-50/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-51/
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:21378
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:21380

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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