# DSA-6033-1: bind9 security update

DSA-6033-1, released October 23, 2025, fixes 1 CVE in bind9. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/dsa-6033-1
- Platform: Linux
- Released: Oct 23, 2025
- Priority: High (Closes CVE-2025-40778, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://security-tracker.debian.org/tracker/CVE-2025-40778

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [bind9](https://patchblox.com/security/data/product/linux/bind9.md) | Debian 12.15 (bookworm) | 1:9.18.41-1~deb12u1 |
| [bind9](https://patchblox.com/security/data/product/linux/bind9.md) | Debian 13.5 (trixie) | 1:9.20.15-1~deb13u1 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2025-40778](https://patchblox.com/security/data/cve/CVE-2025-40778.md) | High | Cache poisoning attacks with unsolicited RRs | 8.6 | 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo