CVE-2025-5987 · cross-distro fix matrix

CVE-2025-5987: A flaw was found in libssh when using the ChaCha20 cipher with the OpenSSL library. If an attacker manages to exhaust the heap space, this error is not detected and may lead to libssh using a partially initialized cipher context. This occurs because the OpenSSL error code returned aliases with the S

Affects 3 Linux releases across 3 (distro × package) combinations.

Fix per ecosystem

Each block below is a distro release where CVE-2025-5987 has a known fix. Run the listed command on that distro to remediate.

Debian bookworm

Source: Debian Security Tracker

libssh→ fixed in0.10.6-0+deb12u2urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libssh
```

Debian trixie

Source: Debian Security Tracker

libssh→ fixed in0.11.2-1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libssh
```

Alpine edge

Source: Alpine secdb

libssh→ fixed in0.11.2-r0
```
apk update && apk add --upgrade libssh
```

Are YOU affected by CVE-2025-5987?

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.

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