SB2025091209 - Remote denial of service in libssh SFTP logic
Published: September 12, 2025 Updated: February 24, 2026
Security Bulletin ID
SB2025091209
Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Integer overflow (CVE-ID: CVE-2025-5449)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to an incorrect packet length check within the SFTP server message decoding logic when handling large payload sizes on 32-bit systems. A remote attacker can trick the victim into connecting to a malicious server, trigger an integer overflow and crash the application.
Remediation
Install update from vendor's website.
References
- https://access.redhat.com/security/cve/CVE-2025-5449
- https://bugzilla.redhat.com/show_bug.cgi?id=2369705
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=261612179f740bc62ba363d98b3bd5e5573a811f
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=3443aec90188d6aab9282afc80a81df5ab72c4da
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=5504ff40515439a5fecbb17da7483000c4d12eb7
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=78485f446af9b30e37eb8f177b81940710d54496
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=f79ec51b7fd519dbc5737a7ba826e3ed093f6ceb
- https://www.libssh.org/security/advisories/CVE-2025-5449.txt