libssh2 up to 1.11.1 SSH uninitialized resource

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.4$0-$5k5.21

Summaryinfo

A vulnerability was found in libssh2 up to 1.11.1 and classified as problematic. This impacts an unknown function of the component SSH Handler. Such manipulation leads to uninitialized resource. This vulnerability is traded as CVE-2026-58051. The attack may be launched remotely. Furthermore, there is an exploit available.

Detailsinfo

A vulnerability was found in libssh2 up to 1.11.1 and classified as problematic. Affected by this issue is an unknown code of the component SSH Handler. The manipulation with an unknown input leads to a uninitialized resource vulnerability. Using CWE to declare the problem leads to CWE-908. The product uses or accesses a resource that has not been initialized. Impacted is integrity, and availability. CVE summarizes:

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on an uninitialized entry. A malicious SSH server offering the publickey subsystem can use a malformed response to make cleanup free an uninitialized, attacker-influenceable attrs pointer in a connecting libssh2 client.

The weakness was shared by ashdfrkl. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-58051 since 06/28/2026. The exploitation is known to be difficult. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but a public exploit is available.

The exploit is available at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-39971). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 4.8
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (VulnCheck): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uninitialized resource
CWE: CWE-908
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/28/2026 Advisory disclosed
06/28/2026 +0 days CVE reserved
06/28/2026 +0 days VulDB entry created
06/28/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Researcher: ashdfrkl
Status: Not defined

CVE: CVE-2026-58051 (🔒)
GCVE (CVE): GCVE-0-2026-58051
GCVE (VulDB): GCVE-100-374504
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/28/2026 08:13
Updated: 06/28/2026 13:21
Changes: 06/28/2026 08:13 (76), 06/28/2026 13:21 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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