What’s Vulnerable › Vulnerabilities

CVE-2025-3028: Use-after-free triggered by XSLTProcessor

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-04-01 · updated 2026-10-05
• Weakness: CWE-416

Description

JavaScript code running while transforming a document with the XSLTProcessor could lead to a use-after-free. This vulnerability was fixed in Firefox 137, Firefox ESR 115.22, Firefox ESR 128.9, Thunderbird 137, and Thunderbird 128.9.

Affected products

• Mozilla Firefox: before 115.22.0; before 137.0; from 116.0 before 128.9.0 — fixed in 115.22.0, 128.9.0, 137.0
• Mozilla Thunderbird: before 128.9.0; from 129.0 through 137.0 — fixed in 128.9.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.22.0, 128.9.0, 137.0; Mozilla Thunderbird 128.9.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1941002
• https://www.mozilla.org/security/advisories/mfsa2025-20/
• https://www.mozilla.org/security/advisories/mfsa2025-21/
• https://www.mozilla.org/security/advisories/mfsa2025-22/
• https://www.mozilla.org/security/advisories/mfsa2025-23/
• https://www.mozilla.org/security/advisories/mfsa2025-24/
• https://lists.debian.org/debian-lts-announce/2025/04/msg00005.html

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