PT-2026-29141 · Krb5+3 · Krb5+3

Prahal · Published 2026-01-01 · Updated 2026-04-28 · CVE-2026-33995

Positive Technologies (AI Summary)

CVSS v3.1

5.3

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Name of the Vulnerable Software and Affected Versions FreeRDP versions prior to 3.24.2

Description FreeRDP is a free implementation of the Remote Desktop Protocol. A double-free issue exists in the kerberos AcceptSecurityContext() and kerberos InitializeSecurityContextA() functions (WinPR, winpr/libwinpr/sspi/Kerberos/kerberos.c). This can lead to a crash in FreeRDP clients on systems configured with Kerberos and/or Kerberos U2U, such as Samba AD members or systems using krb5 for NFS. The crash occurs during Network Level Authentication (NLA) connection teardown and requires a failed authentication attempt.

Recommendations Upgrade to FreeRDP version 3.24.2 or later.

Exploit

Fix

Double Free

Weakness Enumeration

CWE-415

Related Identifiers

BDU:2026-04674

CVE-2026-33995

GHSA-MV25-F4P2-5MXX

OPENSUSE-SU-2026:10633-1

OPENSUSE-SU-2026:20657-1

SUSE-SU-2026:21436-1

Affected Products

Freerdp

Samba

Winpr

Krb5

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33995.json · Exploit
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-mv25-f4p2-5mxx · Vendor Advisory
• https://github.com/FreeRDP/FreeRDP/commit/8078b8af1359055972e4fb2f509f543b69169391 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-33995 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10633-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-33995 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-33995 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-04674 · Security Note
• https://ubuntu.com/security/CVE-2026-33995 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-33995 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-33995 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2026-33995 · Security Note
• https://altsp.su/obnovleniya-bezopasnosti · Note
• https://suse.com/security/cve/CVE-2026-33982 · Note
• https://suse.com/security/cve/CVE-2026-33977 · Note