GSSAPI Key Exchange Vulnerability in libssh
CVE-2026-59842

3.7LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Hardened Images
Vendor
CVE Published:
21 July 2026

What is CVE-2026-59842?

A vulnerability exists in libssh that affects the server-side GSSAPI key exchange process. The flaw arises when a client submits a Curve25519 public key that is shorter than the expected length. This key is then copied without appropriate length validation, potentially leading to an out-of-bounds heap read. As a result, a remote unauthenticated attacker could exploit this issue to disclose small amounts of memory from the server, posing security risks.

References

https://access.redhat.com/security/cve/CVE-2026-59842
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2498168
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
3.7
Severity:
LOW
Confidentiality:
Low
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Haruki Oyama, Yi Lin, and nevv for reporting this issue.
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