Medium severity · published Jul 21, 2026
CVE-2026-59842
Libssh: libssh: information disclosure via short gssapi curve25519 public key
5.3
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 42% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat Enterprise Linux 10 · Red Hat
All versions, or not specified · source: vendor
RH
Red Hat Hardened Images · Red Hat
All versions, or not specified · source: vendor
EL
Enterprise Linux · Redhat
10.0; 10.0; 10.0; 10.2; 10.2 · source: NVD
EL
Enterprise Linux For Els · Redhat
10.2; 10.2 · source: NVD
EL
Enterprise Linux For Eus · Redhat
10.2; 10.2 · source: NVD
EL
Enterprise Linux For Ibm Z Systems · Redhat
10.0; 10.2 · source: NVD
EL
Enterprise Linux For Ibm Z Systems Els · Redhat
10.2 · source: NVD
EL
Enterprise Linux For Ibm Z Systems Eus · Redhat
10.2 · source: NVD
EL
Enterprise Linux For Power Little Endian · Redhat
10.0; 10.2 · source: NVD
EL
Enterprise Linux For Power Little Endian Els · Redhat
10.2 · source: NVD
EL
Enterprise Linux For Power Little Endian Eus · Redhat
10.2 · source: NVD
HI
Hardened Images · Redhat
All versions, or not specified · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-59842
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-59842
Issue Tracking
https://access.redhat.com/errata/RHSA-2026:42922
Vendor Advisory
https://access.redhat.com/errata/RHSA-2026:55855
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-59842
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2498168
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