# RHSA-2024:0001: thunderbird security update

RHSA-2024:0001, released January 2, 2024, fixes 11 CVEs in thunderbird (version 0:115.6.0-1.el9_3). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2024-0001
- Platform: Linux
- Released: Jan 2, 2024
- Priority: High (Closes CVE-2023-6856, high severity)
- CVEs: 11, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2024:0001

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [thunderbird](https://patchblox.com/security/data/product/linux/thunderbird.md) | RHEL 9 | 0:115.6.0-1.el9_3 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2023-6856](https://patchblox.com/security/data/cve/CVE-2023-6856.md) | High | Mozilla Firefox ESR and 5 others: The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems… | 8.8 | 0.2063 |  |
| [CVE-2023-6858](https://patchblox.com/security/data/cve/CVE-2023-6858.md) | High | Mozilla Firefox ESR and 5 others: Out-of-bounds Write | 8.8 | 0.0154 |  |
| [CVE-2023-6861](https://patchblox.com/security/data/cve/CVE-2023-6861.md) | High | Mozilla Firefox ESR and 5 others: The `nsWindow::PickerOpen(void)` method was susceptible to a heap buffer overflow when running in headless… | 8.8 | 0.0141 |  |
| [CVE-2023-6864](https://patchblox.com/security/data/cve/CVE-2023-6864.md) | High | Mozilla Firefox ESR and 5 others: Memory safety bugs present in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5. | 8.8 | 0.0119 |  |
| [CVE-2023-6859](https://patchblox.com/security/data/cve/CVE-2023-6859.md) | High | Mozilla Firefox ESR and 5 others: A use-after-free condition affected TLS socket creation when under memory pressure. | 8.8 | 0.0109 |  |
| [CVE-2023-6863](https://patchblox.com/security/data/cve/CVE-2023-6863.md) | High | Mozilla Firefox ESR and 5 others: The `ShutdownObserver()` was susceptible to potentially undefined behavior due to its reliance on a dynamic… | 8.8 | 0.0104 |  |
| [CVE-2023-6862](https://patchblox.com/security/data/cve/CVE-2023-6862.md) | High | Mozilla Thunderbird and 1 other: A use-after-free was identified in the `nsDNSService::Init`. | 8.8 | 0.0095 |  |
| [CVE-2023-50761](https://patchblox.com/security/data/cve/CVE-2023-50761.md) | High | Mozilla Thunderbird and 1 other: The signature of a digitally signed S/MIME email message may optionally specify the signature creation… | 7.5 | 0.0063 |  |
| [CVE-2023-50762](https://patchblox.com/security/data/cve/CVE-2023-50762.md) | High | Mozilla Thunderbird and 1 other: When processing a PGP/MIME payload that contains digitally signed text, the first paragraph of the text… | 7.5 | 0.0063 |  |
| [CVE-2023-6860](https://patchblox.com/security/data/cve/CVE-2023-6860.md) | Routine | Mozilla Firefox ESR and 5 others: The `VideoBridge` allowed any content process to use textures produced by remote decoders. | 6.5 | 0.0096 |  |
| [CVE-2023-6857](https://patchblox.com/security/data/cve/CVE-2023-6857.md) | Routine | thunderbird: When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary | 6.1 | 0.0067 |  |

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Data as of 2026-11-07T06:34:28Z 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