EUVD-2026-14806
GHSA-h895-88fj-h89r
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionNVD
Use-after-free in the CSS Parsing and Computation component. This vulnerability affects Firefox < 149, Firefox ESR < 115.34, and Firefox ESR < 140.9.
AnalysisAI
Critical use-after-free in Mozilla Firefox's CSS parsing engine enables unauthenticated remote code execution with no user interaction required, affecting Firefox versions below 149, ESR 115.34, and ESR 140.9. An attacker can exploit this memory corruption vulnerability by crafting a malicious web page that triggers the vulnerability when rendered, achieving full system compromise. …
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RemediationAI
Within 24 hours: Identify all affected systems and apply vendor patches immediately. If patching is delayed, consider network segmentation to limit exposure.
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Vendor StatusVendor
Debian
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| sid | vulnerable | 148.0.2-1 | - |
| (unstable) | fixed | (unfixed) | - |
| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| bullseye | vulnerable | 115.14.0esr-1~deb11u1 | - |
| bullseye (security) | vulnerable | 140.8.0esr-1~deb11u1 | - |
| bookworm | vulnerable | 128.14.0esr-1~deb12u1 | - |
| bookworm (security) | vulnerable | 140.8.0esr-1~deb12u1 | - |
| trixie (security), trixie | vulnerable | 140.8.0esr-1~deb13u1 | - |
| forky, sid | vulnerable | 140.8.0esr-1 | - |
| (unstable) | fixed | (unfixed) | - |
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External POC / Exploit Code
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