CVE-2026-55199 · cross-distro fix matrix

CVE-2026-55199: It was discovered that libssh2 incorrectly handled the sftp_symlink()

Affects 6 Linux releases across 13 (distro × package) combinations. First disclosed: 2026-06-17.

CVSS v3:MEDIUM · 5.9(NVD-published)

Fix per ecosystem

Each block below is a distro release where CVE-2026-55199 has a known fix. Run the listed command on that distro to remediate.

Ubuntu noble

Source: Ubuntu USN

libssh2→ fixed in1.11.0-4.1ubuntu0.24.04.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2
```
libssh2-1-dev→ fixed in1.11.0-4.1ubuntu0.24.04.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2-1-dev
```
libssh2-1t64→ fixed in1.11.0-4.1ubuntu0.24.04.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2-1t64
```

Ubuntu questing

Source: Ubuntu USN

libssh2→ fixed in1.11.1-1ubuntu0.25.10.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2
```
libssh2-1-dev→ fixed in1.11.1-1ubuntu0.25.10.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2-1-dev
```
libssh2-1t64→ fixed in1.11.1-1ubuntu0.25.10.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2-1t64
```

Ubuntu resolute

Source: Ubuntu USN

libssh2→ fixed in1.11.1-1ubuntu0.26.04.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2
```
libssh2-1-dev→ fixed in1.11.1-1ubuntu0.26.04.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2-1-dev
```
libssh2-1t64→ fixed in1.11.1-1ubuntu0.26.04.2USN-8486-1
```
sudo apt-get install --only-upgrade -y libssh2-1t64
```

Debian trixie

Source: Debian Security Tracker

libssh2→ fixed in1.11.1-1+deb13u1urgency: not yet assigned
```
sudo apt-get install --only-upgrade -y libssh2
```

Alpine v3.21

Source: Alpine secdb

libssh2→ fixed in1.11.1-r2
```
apk update && apk add --upgrade libssh2
```

Alpine edge

Source: Alpine secdb

libssh2→ fixed in1.11.1-r3
```
apk update && apk add --upgrade libssh2
```
rust→ fixed in1.96.1-r0
```
apk update && apk add --upgrade rust
```

Are YOU affected by CVE-2026-55199?

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

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