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9.1
Firefox and Thunderbird: Graphics Text Memory Leak
CVE-2026-2806
Summary
Old versions of Firefox and Thunderbird have a memory leak in their graphics text feature. This means that sensitive information could be exposed if an attacker exploits this weakness. To protect yourself, update to the latest version of either browser as soon as possible.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| mozilla | firefox | <= 148.0 | – |
| mozilla | thunderbird | <= 148.0 | – |
Original title
Uninitialized memory in the Graphics: Text component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
Original description
Uninitialized memory in the Graphics: Text component. This vulnerability affects Firefox < 148 and Thunderbird < 148.
nvd CVSS3.1
9.1
Vulnerability type
CWE-908
Use of Uninitialized Resource
CWE-457
- https://bugzilla.mozilla.org/show_bug.cgi?id=2006199 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-13/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/ Vendor Advisory
Published: 24 Feb 2026 · Updated: 12 Mar 2026 · First seen: 6 Mar 2026