CVE-2026-58050

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.0 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H                                    

Vulnerability Description

libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.

Vulnerability Details

Published Date

June 28, 2026

Last Modified

June 28, 2026

CWE ID

CWE-190

Source

NVD

Vendor

libssh2

Product

libssh2

External References

https://github.com/bikini/exploitarium/tree/main/libssh2-publickey-list-calc-poc
https://github.com/libssh2/libssh2/blob/master/src/publickey.c
https://www.vulncheck.com/advisories/libssh2-integer-overflow-in-publickey-subsystem-attribute-allocation

CVE-2026-58050

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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