CVE-2026-4691 (GCVE-0-2026-4691)
Vulnerability from cvelistv5 – Published: 2026-03-24 12:30 – Updated: 2026-06-30 12:06
VLAI?
Title
Use-after-free in the CSS Parsing and Computation component
Summary
Use-after-free in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
Severity ?
9.8 (Critical)
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Mozilla | Firefox |
Unaffected:
115.34 , ≤ 115.*
(rpm)
Unaffected: 140.9 , ≤ 140.* (rpm) Unaffected: 149 , ≤ * (rpm) |
|||||||
|
|||||||||
Credits
Fabius Artrel
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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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