DEBIAN-CVE-2025-4877

There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.

References

https://security-tracker.debian.org/tracker/CVE-2025-4877

Affected packages

Debian:12 / libssh

Package

Name: libssh
Purl: pkg:deb/debian/libssh?arch=source&distro=bookworm

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.10.6-0+deb12u2

Affected versions

0.*

0.10.5-2

0.10.5-3

0.10.5-3+hurd.1

0.10.6-0+deb12u1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4877.json"

Debian:13 / libssh

Package

Name: libssh
Purl: pkg:deb/debian/libssh?arch=source&distro=trixie

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.11.2-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4877.json"

Debian:14 / libssh

Package

Name: libssh
Purl: pkg:deb/debian/libssh?arch=source&distro=forky

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0 Unknown introduced version / All previous versions are affected

Fixed

0.11.2-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Database specific

source

"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-4877.json"