# DSA-5090-1: firefox-esr security update

DSA-5090-1, released March 6, 2022, fixes 1 CVE in firefox-esr (version 91.6.1esr-1~deb11u1). One of them is being exploited (CVE-2022-26485); 1 on CISA KEV. Patch Radar priority: Patch now. The product is no longer supported.

- Web page: https://patchblox.com/security/fix/linux/dsa-5090-1
- Platform: Linux
- Released: Mar 6, 2022
- Priority: Patch now (Closes CVE-2022-26485, exploited (CISA KEV))
- CVEs: 1, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2022-26485

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [firefox-esr](https://patchblox.com/security/data/product/linux/firefox-esr.md) | Debian 11.6 (bullseye) | 91.6.1esr-1~deb11u1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2022-26485](https://patchblox.com/security/data/cve/CVE-2022-26485.md) | Patch now | Mozilla Firefox Use-After-Free Vulnerability | 9.8 | 0.1426 | CISA KEV |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo