CVE-2026-58050: libssh2 - Integer Overflow in publickey Subsystem Attribute Allocation
No fix listed · Affected: libssh2 · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
Higher than 39% of scored CVEs
DescriptionNVD
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.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 28 Jun.
- CVE-2026-58050 bug lets bad SSH servers hijack libssh2 clientsSecurityOnline · first in our coverage
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