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CVE

CVE-2026-40170

RHSA-2026:25049: samba security update (Critical)
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CVE

CVE-2026-40170

RHSA-2026:25049: samba security update (Critical)

Samba is an open-source implementation of the Server Message Block (SMB) protocol and the related Common Internet File System (CIFS) protocol, which allow PC-compatible machines to share files, printers, and various information.

Security Fix(es):

  • samba: Missing access check on reparse point operations (CVE-2026-1933)
  • samba: vfs_worm does not block directory modification (CVE-2026-2340)
  • samba: group policy certificate enrollment uses http:// without validation (CVE-2026-3012)
  • samba: Samba: Remote Code Execution in printing subsystem via unescaped job description (CVE-2026-4480)
  • ngtcp2: ngtcp2: Denial of service via stack buffer overflow during QUIC handshake (CVE-2026-40170)
  • samba: Remote Code Execution in SAMR (CVE-2026-4408)

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
7.5
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/errata/RHSA-2026:25049, https://access.redhat.com/security/cve/CVE-2026-1933, https://access.redhat.com/security/cve/CVE-2026-2340, https://access.redhat.com/security/cve/CVE-2026-3012, https://access.redhat.com/security/cve/CVE-2026-40170, https://access.redhat.com/security/cve/CVE-2026-4408, https://access.redhat.com/security/cve/CVE-2026-4480

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.00023%
EPSS Percentile
0.06899%
Introduced Version
0
Fix Available
0:4.23.5-10.el9_8,0.12.1+dfsg-1+deb12u1,1.11.0-1+deb13u1,0:0.12.1+dfsg-1+deb12u1build0.24.04.1,0:0.1.0+dfsg-1ubuntu0.1~esm1,1.5.0-r1,1.22.1,1.22.1-r0,1.12.0-r1,0:1.21.0-1.amzn2023.0.2

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