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CVE-2026-59842

Libssh: libssh: information disclosure via short gssapi curve25519 public key

Published: Jul 21, 2026Updated: Jul 30, 2026 Sources: CVE List NVDCWE-125
3.7LOW
NVD MITRE
EPSS Score
0.4%
Top 65.4%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:UC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-125

Affected Products

Red Hat
commercial·USaka redhat
Red Hat Hardened ImagesOn-premOS
Operating Systems / linux-distro
Red Hat Enterprise Linux 10On-premOS
Operating Systems / linux-distro
hardened imagesOn-prem
Operating Systems / linux-distro
libssh
oss-projectaka libssh2 (related, sometimes confused)
libsshLibrary
OSS Libraries / generic-library
and 3 more affected products View all →

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Collection
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:42922
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-59842
access.redhat.com
https://bugzilla.redhat.com/show_bug.cgi?id=2498168
bugzilla.redhat.com

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