CVE-2025-4087: Unsafe attribute access during XPath parsing
A vulnerability was identified in Firefox where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption.
Other sources
A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption.
— Mozilla
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 128.10 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 138 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 138 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 128.10 - Upgrade
Upgrade
Thunderbird ESRto a version that resolves this vulnerability.Fixed in 128.10
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
Frequently Asked Questions
What is the severity of CVE-2025-4087?
CVE-2025-4087 has a high severity as it can lead to out-of-bounds read access and potential memory corruption.
How do I fix CVE-2025-4087?
To fix CVE-2025-4087, update to Firefox version 138 or later, Firefox ESR version 128.10 or later, or the appropriate version for Thunderbird.
What software is affected by CVE-2025-4087?
CVE-2025-4087 affects Firefox versions prior to 138, Firefox ESR versions prior to 128.10, and Thunderbird versions prior to 138.
What kind of attacks can CVE-2025-4087 facilitate?
CVE-2025-4087 can facilitate attacks that exploit memory corruption vulnerabilities, potentially leading to system crashes or arbitrary code execution.
Is CVE-2025-4087 specific to desktop versions of the software?
CVE-2025-4087 affects desktop versions of Firefox and Thunderbird, including their ESR counterparts.