Multiple double free vulnerabilities in the (1) agent_sign_data function in agent.c, (2)…
Priority LOW 38CWE-399Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- Code execution
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-399 and the CVSS impact.
Summary
Multiple double free vulnerabilities in the (1) agent_sign_data function in agent.c, (2) channel_request function in channels.c, (3) ssh_userauth_pubkey function in auth.c, (4) sftp_parse_attr_3 function in sftp.c, and (5) try_publickey_from_file function in keyfiles.c in libssh before 0.5.3 allow remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via unspecified vectors.
Why it matters now
EPSS 0.05176 92nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* | up to 0.5.2 | Vulnerable | libssh |
| cpe:2.3:a:libssh:libssh:0.4.7:*:*:*:*:*:*:* | 0.4.7 | Vulnerable | libssh |
| cpe:2.3:a:libssh:libssh:0.4.8:*:*:*:*:*:*:* | 0.4.8 | Vulnerable | libssh |
| cpe:2.3:a:libssh:libssh:0.5.0:*:*:*:*:*:*:* | 0.5.0 | Vulnerable | libssh |
| cpe:2.3:a:libssh:libssh:0.5.0:rc1:*:*:*:*:*:* | 0.5.0 rc1 | Vulnerable | libssh |
| cpe:2.3:a:libssh:libssh:0.5.1:*:*:*:*:*:*:* | 0.5.1 | Vulnerable | libssh |
- cpe:2.3:a:libssh:libssh:*:*:*:*:*:*:*:* Versions up to 0.5.2 Vulnerable ·libssh
- cpe:2.3:a:libssh:libssh:0.4.7:*:*:*:*:*:*:* Versions 0.4.7 Vulnerable ·libssh
- cpe:2.3:a:libssh:libssh:0.4.8:*:*:*:*:*:*:* Versions 0.4.8 Vulnerable ·libssh
- cpe:2.3:a:libssh:libssh:0.5.0:*:*:*:*:*:*:* Versions 0.5.0 Vulnerable ·libssh
- cpe:2.3:a:libssh:libssh:0.5.0:rc1:*:*:*:*:*:* Versions 0.5.0 rc1 Vulnerable ·libssh
- cpe:2.3:a:libssh:libssh:0.5.1:*:*:*:*:*:*:* Versions 0.5.1 Vulnerable ·libssh
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2012-4559
- 2026-10-03 Alias added: GHSA-px93-6r58-rr4j
References
Advisory 9
More Libssh vulnerabilities
- TI-2018-07745 Improper authentication in [UNKNOWN] libssh CVSS 3.0CRITICAL 9.1
- TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
- TI-2012-03902 Multiple integer overflows in libssh before 0.5.3 allow remote attackers to cause a… CVSS 2.0HIGH 7.5
- TI-2019-11093 OS command injection in Red Hat libssh CVSS 3.1HIGH 8.8
- TI-2026-00732 Libssh: libssh: denial of service via zero-length input in ssh_get_hexa() CVSS 3.1HIGH 8.2
- TI-2012-03900 Multiple buffer overflows in libssh before 0.5.3 allow remote attackers to cause a denial… CVSS 2.0HIGH 7.5
Sources
- CVE-2012-4559 · CVE Program
- CVE-2012-4559 · NVD
- FIRST EPSS
- GHSA-px93-6r58-rr4j · GitHub Advisory Database · CC BY 4.0
- CVE-2012-4559 · Red Hat security data · CC BY 4.0
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