Dashboard / CVE-2026-59842

CVE-2026-59842

MEDIUM
MEDIUM Priority: 0.03 BB Relevance: 71/100
Published: 2026-07-21 Modified: 2026-11-06 First seen: 2026-11-06 Status: active

Attack Surface

Network Low Complexity No Auth No Interaction

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: None
S: Unchanged
C: Low
I: None
A: None

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.

Weakness Classification (1)

Affected Software (19)

VendorProductVersion
libssh libssh 0.12.0
redhat enterprise_linux 10.0
redhat enterprise_linux 10.0
redhat enterprise_linux 10.0
redhat enterprise_linux 10.2
redhat enterprise_linux 10.2
redhat enterprise_linux_for_els 10.2
redhat enterprise_linux_for_els 10.2
redhat enterprise_linux_for_eus 10.2
redhat enterprise_linux_for_eus 10.2
redhat enterprise_linux_for_ibm_z_systems 10.0
redhat enterprise_linux_for_ibm_z_systems 10.2
redhat enterprise_linux_for_ibm_z_systems_els 10.2
redhat enterprise_linux_for_ibm_z_systems_eus 10.2
redhat enterprise_linux_for_power_little_endian 10.0
redhat enterprise_linux_for_power_little_endian 10.2
redhat enterprise_linux_for_power_little_endian_els 10.2
redhat enterprise_linux_for_power_little_endian_eus 10.2
redhat hardened_images -

References & Advisories (4)

https://access.redhat.com/errata/RHSA-2026:42922
vendor-advisory x_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:55855
vendor-advisory x_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2498168
issue-tracking x_refsource_REDHAT

Bug Bounty Relevance

71 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity
✓ No user interaction

CVSS Score

5.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS — Exploitation Probability

0.49%
Raw Score 0.004930
Percentile 42.9%
Date 2026-11-13

EPSS Trend

2026-11-13
0.00493
2026-11-12
0.00493
2026-11-10
0.00493
2026-11-09
0.00493
2026-11-08
0.00493
2026-11-07
0.00493
2026-11-06
0.00493

Intelligence Sources

mitre ref →
nvd ref →

External Links