CVE-2026-3497
7.5 HIGHVulnerability in the OpenSSH GSSAPI delta included in various Linux distributions
Published: 2026-03-12 · Last updated: 2026-06-02
Severity and scoring
- CVSS
- 7.5 HIGH
- Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CWE
- CWE-908
Affected products
| Vendor | Product |
|---|---|
| canonical | debian_linux, enterprise_linux, openssh |
| debian | debian_linux, enterprise_linux, openssh |
| openbsd | debian_linux, enterprise_linux, openssh |
| redhat | debian_linux, enterprise_linux, openssh |
Description
Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-3497
- [Other]https://ubuntu.com/security/CVE-2026-3497
- [Other]https://www.openwall.com/lists/oss-security/2026/03/12/3
- [Other]http://www.openwall.com/lists/oss-security/2026/03/12/3
- [Other]http://www.openwall.com/lists/oss-security/2026/03/14/3
- [Other]http://www.openwall.com/lists/oss-security/2026/03/14/4
- [Other]http://www.openwall.com/lists/oss-security/2026/03/18/2
- [Other]http://www.openwall.com/lists/oss-security/2026/03/18/4
- [Other]http://www.openwall.com/lists/oss-security/2026/03/18/5
- [Other]http://www.openwall.com/lists/oss-security/2026/03/18/7
- [Other]https://lists.debian.org/debian-lts-announce/2026/04/msg00014.html
Related CVEs
Same vendor
- CVE-2026-49975 — Memory Allocation with Excessive Size Value vulnerability in Apache HTTP Server's mod_http leads to denial of service via malicious HTTP ... (7.5 HIGH)
- CVE-2026-50259 — A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland (7.8 HIGH)
- CVE-2026-50258 — A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland (7.8 HIGH)
- CVE-2026-50257 — A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence() (7.8 HIGH)
- CVE-2026-50256 — A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland (7.8 HIGH)
Same CWE
- CVE-2026-42969 — Use of uninitialized resource in Windows Push Notifications allows an authorized attacker to disclose information locally (5.5 MEDIUM)
- CVE-2026-48104 — 7-Zip is a file archiver with a high compression ratio (4.2 MEDIUM)
- CVE-2026-48101 — 7-Zip is a file archiver with a high compression ratio (6.5 MEDIUM)
- CVE-2026-11089 — Uninitialized Use in Media in Google Chrome prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to ... (6.5 MEDIUM)
- CVE-2026-26825 — A use-of-uninitialized memory vulnerability exists in libxls 1.6.3 when parsing malformed XLS files (5.3 MEDIUM)