# RHSA-2025:8608: thunderbird security update

RHSA-2025:8608, released May 27, 2025, fixes 9 CVEs in thunderbird (version 128.11.0-1.el10_0). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2025-8608
- Platform: Linux
- Released: May 27, 2025
- Priority: High (Closes CVE-2025-4918, high severity)
- CVEs: 9, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2025:8608

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 10 | 128.11.0-1.el10_0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-4918](https://patchblox.com/security/data/cve/CVE-2025-4918.md) | High | Out-of-bounds access when resolving Promise objects | 9.8 | 0.0952 |  |
| [CVE-2025-4919](https://patchblox.com/security/data/cve/CVE-2025-4919.md) | High | Out-of-bounds access when optimizing linear sums | 8.8 | 0.0912 |  |
| [CVE-2025-5283](https://patchblox.com/security/data/cve/CVE-2025-5283.md) | High | Chromium: CVE-2025-5283 Use after free in libvpx | 8.8 | 0.0064 |  |
| [CVE-2025-5268](https://patchblox.com/security/data/cve/CVE-2025-5268.md) | High | Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11 | 8.8 | 0.0051 |  |
| [CVE-2025-5269](https://patchblox.com/security/data/cve/CVE-2025-5269.md) | High | Memory safety bug fixed in Firefox ESR 128.11 and Thunderbird 128.11 | 8.8 | 0.0048 |  |
| [CVE-2025-5266](https://patchblox.com/security/data/cve/CVE-2025-5266.md) | High | Script element events leaked cross-origin resource status | 8.8 | 0.0034 |  |
| [CVE-2025-5264](https://patchblox.com/security/data/cve/CVE-2025-5264.md) | High | Potential local code execution in “Copy as cURL” command | 8.8 | 0.0030 |  |
| [CVE-2025-5267](https://patchblox.com/security/data/cve/CVE-2025-5267.md) | High | Clickjacking vulnerability could have led to leaking saved payment card details | 8.8 | 0.0028 |  |
| [CVE-2025-5263](https://patchblox.com/security/data/cve/CVE-2025-5263.md) | High | Error handling for script execution was incorrectly isolated from web content | 8.8 | 0.0027 |  |

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Data as of 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo