CVE-2026-59842

EUVD-2026-46176
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
3.7 LOW
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 40.9%
Affected Products (NVD)
VendorProductVersion
libsshlibssh
0.12.0
redhathardened_images
-
redhatenterprise_linux
10.0
redhatenterprise_linux
10.0
redhatenterprise_linux
10.2
redhatenterprise_linux_for_els
10.2
redhatenterprise_linux_for_eus
10.2
redhatenterprise_linux_for_ibm_z_systems
10.0
redhatenterprise_linux_for_ibm_z_systems
10.2
redhatenterprise_linux_for_ibm_z_systems_els
10.2
redhatenterprise_linux_for_ibm_z_systems_eus
10.2
redhatenterprise_linux_for_power_little_endian
10.0
redhatenterprise_linux_for_power_little_endian
10.2
redhatenterprise_linux_for_power_little_endian_els
10.2
redhatenterprise_linux_for_power_little_endian_eus
10.2
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
libssh
bookworm
0.10.6-0+deb12u2
fixed
bookworm (security)
0.10.6-0+deb12u1
fixed
bullseye
not-affected
forky
0.12.2-1
fixed
sid
0.12.2-1
fixed
trixie
0.11.5-0+deb13u1
fixed
trixie (security)
0.11.5-0+deb13u1
fixed
Common Weakness Enumeration
References
https://access.redhat.com/errata/RHSA-2026:42922
https://access.redhat.com/errata/RHSA-2026:55855
https://access.redhat.com/security/cve/CVE-2026-59842
https://bugzilla.redhat.com/show_bug.cgi?id=2498168