RLSA-2026:55855

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Source
https://errata.rockylinux.org/RLSA-2026:55855
Import Source
https://storage.googleapis.com/resf-osv-data/RLSA-2026:55855.json
JSON Data
https://api.osv.dev/v1/vulns/RLSA-2026:55855
Upstream
  • CVE-2026-15370
  • CVE-2026-59842
  • CVE-2026-59843
  • CVE-2026-59844
  • CVE-2026-59845
  • CVE-2026-59846
  • CVE-2026-59848
  • CVE-2026-59849
  • CVE-2026-59850
  • CVE-2026-59851
Published
2026-08-18T12:07:31Z
Modified
2026-08-18T12:30:03Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Important: libssh security update
Details

libssh is a library which implements the SSH protocol. It can be used to implement client and server applications.

Security Fix(es):

  • libssh: libssh: information disclosure via short GSSAPI Curve25519 public key (CVE-2026-59842)

  • libssh: libssh: denial of service via zero advertised channel packet size (CVE-2026-59843)

  • libssh: libssh: denial of service via oversized SFTP read length (CVE-2026-59844)

  • libssh: libssh: denial of service via unchecked ProxyCommand fork() failure (CVE-2026-59845)

  • libssh: libssh: information disclosure via ProxyCommand %r username expansion (CVE-2026-59846)

  • libssh: libssh: integrity downgrade via OpenSSL AES-GCM tag verification (CVE-2026-59847)

  • libssh: libssh: denial of service via SFTP responses with unknown request IDs (CVE-2026-59848)

  • libssh: libssh: denial of service via automatic certificate authentication loop (CVE-2026-59849)

  • libssh: libssh: use-after-free via data callbacks on closed channels (CVE-2026-59850)

  • libssh: libssh: authentication bypass via missing GSSAPI principal check (CVE-2026-59851)

  • libssh: libssh: stack buffer overflow in SFTP server longname construction (CVE-2026-15370)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Database specific 
{
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:55855"
}
References
Credits
    • Rocky Enterprise Software Foundation
    • Red Hat

Affected packages

Rocky Linux:10 / libssh

Package

Name
libssh
Purl
pkg:rpm/rocky-linux/libssh?distro=rocky-linux-10&epoch=0

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0:0.12.0-3.el10_2
Database specific
Show details 
{
    "yum_repository": "BaseOS"
}

Database specific

source 
"https://storage.googleapis.com/resf-osv-data/RLSA-2026:55855.json"