Linux · 
Red Hat · Security advisory · June 24, 2026
Red Hat · Security advisory · June 24, 2026RHSA-2026:27734: Security update for 2 packages
RHSA-2026:27734, released June 24, 2026, fixes 29 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: Urgent.
Urgent
CVEs closed
29
6 rated Critical
Exploited
0
None reported
Highest CVSS
9.6
Base score, 0 to 10
Highest EPSS
0.0049
42nd percentile
Priority of the 29 CVEs
Patch now 0
Urgent 6
High 23
Routine 0
Fixed package versions
| Product | Release | Fixed in |
|---|---|---|
| firefox | RHEL 9 | 0:140.12.0-1.el9_8 |
| firefox-x11 | RHEL 9 | 0:140.12.0-1.el9_8 |
CVEs this fix closes
| Priority | CVE | Title | CVSS | EPSS | Exploitation |
|---|---|---|---|---|---|
| Urgent | CVE-2026-12295 | Sandbox escape in the DOM: Navigation component | 9.6 | 0.0039 | None reported |
| Urgent | CVE-2026-12296 | Sandbox escape in the Security: Process Sandboxing component | 9.6 | 0.0039 | None reported |
| Urgent | CVE-2026-12297 | Sandbox escape due to incorrect boundary conditions in the Networking component | 9.6 | 0.0039 | None reported |
| Urgent | CVE-2026-12294 | Sandbox escape in the DOM: Workers component | 9.6 | 0.0036 | None reported |
| Urgent | CVE-2026-12315 | Mitigation bypass in the DOM: Security component | 9.1 | 0.0025 | None reported |
| Urgent | CVE-2026-12304 | Same-origin policy bypass in the Networking: Cookies component | 9.1 | 0.0019 | None reported |
| High | CVE-2026-12292 | Incorrect boundary conditions in the Web Audio component | 8.1 | 0.0049 | None reported |
| High | CVE-2026-12328 | Memory safety bugs fixed in Firefox ESR 115.37, Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 | 8.1 | 0.0048 | None reported |
| High | CVE-2026-12327 | Memory safety bugs fixed in Firefox ESR 140.12, Thunderbird ESR 140.12, Firefox 152 and Thunderbird 152 | 8.1 | 0.0041 | None reported |
| High | CVE-2026-12290 | Memory safety bug fixed in Thunderbird 152 | 8.1 | 0.0040 | None reported |
| High | CVE-2026-12289 | Privilege escalation in the Graphics: WebRender component | 8.8 | 0.0040 | None reported |
| High | CVE-2026-12291 | Use-after-free in the Networking: HTTP component | 8.8 | 0.0038 | None reported |
| High | CVE-2026-12305 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0037 | None reported |
| High | CVE-2026-12329 | Memory safety bug fixed in Thunderbird ESR 140.12 | 7.5 | 0.0031 | None reported |
| High | CVE-2026-12298 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0031 | None reported |
| High | CVE-2026-12299 | JIT miscompilation in the DOM: Core & HTML component | 7.5 | 0.0031 | None reported |
| High | CVE-2026-12306 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0026 | None reported |
| High | CVE-2026-12307 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0026 | None reported |
| High | CVE-2026-12308 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0026 | None reported |
| High | CVE-2026-12310 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0025 | None reported |
| High | CVE-2026-12312 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0025 | None reported |
| High | CVE-2026-12314 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0025 | None reported |
| High | CVE-2026-12302 | Mitigation bypass in the DOM: Security component | 7.5 | 0.0025 | None reported |
| High | CVE-2026-12309 | Memory safety bug fixed in Thunderbird 152 | 7.5 | 0.0024 | None reported |
| High | CVE-2026-12325 | Denial-of-service in the Graphics: ImageLib component | 7.5 | 0.0023 | None reported |
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