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CVE-2026-6749

Information disclosure due to uninitialized memory in the Graphics: Canvas2D component

HIGH
7.5
CVSS Score
Published: April 21, 2026 at 12:40 PM UTC
Updated: October 25, 2026 at 11:10 PM UTC
3 products affected across 2 vendorsFirefoxThunderbirdEnterprise Linux

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Information disclosure due to uninitialized memory in the Graphics: Canvas2D component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, and Firefox ESR 140.10.

Affected

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

Firefox· Mozilla
95%
v < 115.35.0v < 150.0140.0 ≤ v < 140.10.0
Vendor states this is fixed in 115.35 (unaffected)
Affected range stops below 115.35.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 140.10 (unaffected)
Affected range stops below 140.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 150 (unaffected)
Affected range stops below 150.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 140.10.0
Vendor states this is fixed in 140.10 (unaffected)
Affected range stops below 140.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 150 (unaffected)
Enterprise Linux· Red Hatrpm
60%
10
Vendor states this is fixed in 0:140.10.0-1.el10_0 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el10_1 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el10_2 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_10 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_4 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_6 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el8_8 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_0 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_2 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_4 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_6 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_7 (unaffected)
Vendor states this is fixed in 0:140.10.0-1.el9_8 (unaffected)
Vendor states this is fixed in 0:140.10.0-2.el7_9 (unaffected)
Vendor states this is fixed in 0:140.10.1-1.el9_8 (unaffected)
Vendor states this is fixed in 6 (unknown)
Vendor states this is fixed in 7 (unknown)

References (36)

Permissions Required
Source: cverecord
https://bugzilla.mozilla.org/show_bug.cgi?id=2022610
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-30/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-31/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-32/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-33/
Vendor Advisory
Source: cverecord
https://www.mozilla.org/security/advisories/mfsa2026-34/
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10757
Source: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
https://access.redhat.com/errata/RHSA-2026:10766

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-908CWE-824

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