CVE-2025-26465 · cross-distro fix matrix

CVE-2025-26465: A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For a

Affects 8 Linux releases across 8 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2025-26465 has a known fix. Run the listed command on that distro to remediate.

Debian bullseye

Source: Debian Security Tracker

openssh→ fixed in1:8.4p1-5+deb11u4urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssh
```

Debian bookworm

Source: Debian Security Tracker

openssh→ fixed in1:9.2p1-2+deb12u5urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssh
```

Debian trixie

Source: Debian Security Tracker

openssh→ fixed in1:9.9p2-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y openssh
```

Alpine v3.20

Source: Alpine secdb

openssh→ fixed in9.7_p1-r5
```
apk update && apk add --upgrade openssh
```

Alpine v3.21

Source: Alpine secdb

openssh→ fixed in9.9_p2-r0
```
apk update && apk add --upgrade openssh
```

Alpine edge

Source: Alpine secdb

openssh→ fixed in9.9_p2-r0
```
apk update && apk add --upgrade openssh
```

Alpine v3.18

Source: Alpine secdb

openssh→ fixed in9.3_p2-r3
```
apk update && apk add --upgrade openssh
```

Alpine v3.19

Source: Alpine secdb

openssh→ fixed in9.6_p1-r2
```
apk update && apk add --upgrade openssh
```

Are YOU affected by CVE-2025-26465?

5-second check on your actual server. Reads /etc/os-release, uname -r, and the distro's package manager; matches against this same cross-source index live.

curl https://mindsparkstack.com/scan.sh | bash

Form-based quickscan View on NVD

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