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CVE-2025-4082

WebGL shader attribute memory corruption in Thunderbird for macOS

MEDIUM
5.9
CVSS Score
Published: April 29, 2025 at 01:13 PM UTC
Updated: October 5, 2026 at 03:10 PM UTC
2 products affected across 1 vendorFirefoxThunderbird

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Severity
MEDIUM5.9
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Modification of specific WebGL shader attributes could trigger an out-of-bounds read, which, when chained with other vulnerabilities, could be used to escalate privileges. *This bug only affects Thunderbird for macOS. Other versions of Thunderbird are unaffected.* This vulnerability affects Firefox < 138, Firefox ESR < 128.10, Firefox ESR < 115.23, Thunderbird < 138, and Thunderbird < 128.10.

Affected

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

Firefox· Mozilla
95%
v < 115.23v < 138.0128.0 ≤ v < 128.10
Vendor states this is fixed in 115.23 (unaffected)
Vendor states this is fixed in 128.10 (unaffected)
Vendor states this is fixed in 138 (unaffected)
Affected range stops below 138.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 128.10.0v < 138.0
Vendor states this is fixed in 128.10 (unaffected)
Affected range stops below 128.10.0, so it looks safe — our inference, not a vendor statement
Vendor states this is fixed in 138 (unaffected)
Affected range stops below 138.0, so it looks safe — our inference, not a vendor statement

References (7)

Permissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1937097
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-28/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-29/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-30/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-31/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2025-32/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2025/05/msg00022.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

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

CVSS

5.9MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-125

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