UBUNTU-CVE-2025-4877

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Source
https://ubuntu.com/security/CVE-2025-4877
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-4877
Upstream
Downstream
Related
Published
2025-06-25T00:00:00Z
Modified
2026-04-22T16:03:13Z
Severity
  • 4.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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

Affected packages

Ubuntu:Pro:16.04:LTS / libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.6.3-4.3ubuntu0.6+esm2?arch=source&distro=esm-infra/xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.6.3-4.3ubuntu0.6+esm2

Affected versions

0.*
0.6.3-3ubuntu3
0.6.3-4.1
0.6.3-4.2
0.6.3-4.2ubuntu1
0.6.3-4.3
0.6.3-4.3ubuntu0.1
0.6.3-4.3ubuntu0.2
0.6.3-4.3ubuntu0.5
0.6.3-4.3ubuntu0.6
0.6.3-4.3ubuntu0.6+esm1

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.6.3-4.3ubuntu0.6+esm2"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.6.3-4.3ubuntu0.6+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"

Ubuntu:Pro:18.04:LTS / libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4?arch=source&distro=esm-infra/bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4

Affected versions

0.*
0.7.5-1
0.8.0~20170825.94fa1e38-1
0.8.0~20170825.94fa1e38-1build1
0.8.0~20170825.94fa1e38-1ubuntu0.1
0.8.0~20170825.94fa1e38-1ubuntu0.2
0.8.0~20170825.94fa1e38-1ubuntu0.5
0.8.0~20170825.94fa1e38-1ubuntu0.6
0.8.0~20170825.94fa1e38-1ubuntu0.7
0.8.0~20170825.94fa1e38-1ubuntu0.7+esm3

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.8.0~20170825.94fa1e38-1ubuntu0.7+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"

Ubuntu:Pro:20.04:LTS / libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.9.3-2ubuntu2.5+esm1?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.3-2ubuntu2.5+esm1

Affected versions

0.*
0.9.0-1ubuntu1
0.9.0-1ubuntu4
0.9.0-1ubuntu5
0.9.3-2ubuntu1
0.9.3-2ubuntu2
0.9.3-2ubuntu2.1
0.9.3-2ubuntu2.2
0.9.3-2ubuntu2.3
0.9.3-2ubuntu2.4
0.9.3-2ubuntu2.5

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.3-2ubuntu2.5+esm1"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.3-2ubuntu2.5+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"

Ubuntu:22.04:LTS / libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.9.6-2ubuntu0.22.04.4?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.9.6-2ubuntu0.22.04.4

Affected versions

0.*
0.9.6-1
0.9.6-1build1
0.9.6-2
0.9.6-2build1
0.9.6-2ubuntu0.22.04.1
0.9.6-2ubuntu0.22.04.2
0.9.6-2ubuntu0.22.04.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.9.6-2ubuntu0.22.04.4"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.9.6-2ubuntu0.22.04.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"

Ubuntu:24.04:LTS / libssh

Package

Name
libssh
Purl
pkg:deb/ubuntu/libssh@0.10.6-2ubuntu0.1?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.10.6-2ubuntu0.1

Affected versions

0.*
0.10.5-3ubuntu1
0.10.5-3ubuntu2
0.10.6-2
0.10.6-2build1
0.10.6-2build2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "libssh-4",
            "binary_version": "0.10.6-2ubuntu0.1"
        },
        {
            "binary_name": "libssh-gcrypt-4",
            "binary_version": "0.10.6-2ubuntu0.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-4877.json"