# RHSA-2026:0924: thunderbird security update

RHSA-2026:0924, released January 21, 2026, fixes 13 CVEs in thunderbird (version 0:140.7.0-1.el9_7). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2026-0924
- Platform: Linux
- Released: Jan 21, 2026
- Priority: High (Closes CVE-2026-0880, high severity)
- CVEs: 13, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2026:0924

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 9 | 0:140.7.0-1.el9_7 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-0880](https://patchblox.com/security/data/cve/CVE-2026-0880.md) | High | Sandbox escape due to integer overflow in the Graphics component | 8.8 | 0.0054 |  |
| [CVE-2026-0879](https://patchblox.com/security/data/cve/CVE-2026-0879.md) | High | Sandbox escape due to incorrect boundary conditions in the Graphics component | 9.8 | 0.0050 |  |
| [CVE-2026-0891](https://patchblox.com/security/data/cve/CVE-2026-0891.md) | High | Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 | 8.1 | 0.0048 |  |
| [CVE-2026-0877](https://patchblox.com/security/data/cve/CVE-2026-0877.md) | High | Mitigation bypass in the DOM: Security component | 8.1 | 0.0047 |  |
| [CVE-2026-0878](https://patchblox.com/security/data/cve/CVE-2026-0878.md) | High | Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component | 8.0 | 0.0047 |  |
| [CVE-2026-0882](https://patchblox.com/security/data/cve/CVE-2026-0882.md) | High | Use-after-free in the IPC component | 8.8 | 0.0047 |  |
| [CVE-2026-0884](https://patchblox.com/security/data/cve/CVE-2026-0884.md) | High | Use-after-free in the JavaScript Engine component | 9.8 | 0.0046 |  |
| [CVE-2026-0885](https://patchblox.com/security/data/cve/CVE-2026-0885.md) | High | Use-after-free in the JavaScript: GC component | 7.5 | 0.0040 |  |
| [CVE-2026-0886](https://patchblox.com/security/data/cve/CVE-2026-0886.md) | High | Incorrect boundary conditions in the Graphics component | 7.5 | 0.0038 |  |
| [CVE-2025-14327](https://patchblox.com/security/data/cve/CVE-2025-14327.md) | High | Spoofing issue in the Downloads Panel component | 7.5 | 0.0038 |  |
| [CVE-2026-0883](https://patchblox.com/security/data/cve/CVE-2026-0883.md) | High | Information disclosure in the Networking component | 7.5 | 0.0036 |  |
| [CVE-2026-0887](https://patchblox.com/security/data/cve/CVE-2026-0887.md) | High | Clickjacking issue, information disclosure in the PDF Viewer component | 7.5 | 0.0033 |  |
| [CVE-2026-0890](https://patchblox.com/security/data/cve/CVE-2026-0890.md) | High | Spoofing issue in the DOM: Copy & Paste and Drag & Drop component | 7.5 | 0.0030 |  |

---

Data as of 2026-11-07T18:46:35Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.