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Critical 9.8Published Feb 24, 2026
CVE-2026-2779Incorrect boundary conditions in the Networking: JAR component.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Incorrect boundary conditions in the Networking: JAR component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
- CVSS
- 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-119
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
mozilla firefox mozilla:firefox | before 140.8.0; before 148.0 | NVD |
mozilla thunderbird mozilla:thunderbird | before 140.8.0; before 148.0 | NVD |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1164141issue-tracking, permissions-required
- https://www.mozilla.org/security/advisories/mfsa2026-13/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-15/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-16/vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2026-17/vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.