# RHSA-2025:21881: thunderbird security update

RHSA-2025:21881, released November 20, 2025, fixes 9 CVEs in thunderbird (version 0:140.5.0-2.el8_10). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2025-21881
- Platform: Linux
- Released: Nov 20, 2025
- Priority: High (Closes CVE-2025-13016, high severity)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2025:21881

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 8 | 0:140.5.0-2.el8_10 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-13016](https://patchblox.com/security/data/cve/CVE-2025-13016.md) | High | Incorrect boundary conditions in the JavaScript: WebAssembly component | 7.5 | 0.0041 |  |
| [CVE-2025-13014](https://patchblox.com/security/data/cve/CVE-2025-13014.md) | High | Use-after-free in the Audio/Video component | 8.8 | 0.0032 |  |
| [CVE-2025-13020](https://patchblox.com/security/data/cve/CVE-2025-13020.md) | High | Use-after-free in the WebRTC: Audio/Video component | 8.8 | 0.0031 |  |
| [CVE-2025-13017](https://patchblox.com/security/data/cve/CVE-2025-13017.md) | High | Same-origin policy bypass in the DOM: Notifications component | 8.1 | 0.0028 |  |
| [CVE-2025-13018](https://patchblox.com/security/data/cve/CVE-2025-13018.md) | High | Mitigation bypass in the DOM: Security component | 8.1 | 0.0028 |  |
| [CVE-2025-13019](https://patchblox.com/security/data/cve/CVE-2025-13019.md) | High | Same-origin policy bypass in the DOM: Workers component | 8.1 | 0.0028 |  |
| [CVE-2025-13012](https://patchblox.com/security/data/cve/CVE-2025-13012.md) | High | Race condition in the Graphics component | 7.5 | 0.0024 |  |
| [CVE-2025-13015](https://patchblox.com/security/data/cve/CVE-2025-13015.md) | High | Spoofing issue in Firefox | 7.5 | 0.0023 |  |
| [CVE-2025-13013](https://patchblox.com/security/data/cve/CVE-2025-13013.md) | High | Mitigation bypass in the DOM: Core & HTML component | 7.5 | 0.0022 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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