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CVE Vulnerability Details :
CVE-2026-40355
PUBLISHED
More InfoOfficial Page
Assigner-mitre
Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca
View Known Exploited Vulnerability (KEV) details
Published At-28 Apr, 2026 | 00:00
Updated At-28 Apr, 2026 | 12:53
Rejected At-
▼CVE Numbering Authority (CNA)

In MIT Kerberos 5 (aka krb5) before 1.22.3, there is a NULL pointer dereference if an application calls gss_accept_sec_context() on a system with a NegoEx mechanism registered in /etc/gss/mech. An unauthenticated remote attacker can trigger this, causing the process to terminate in parse_nego_message.

Affected Products
Vendor
MIT (Massachusetts Institute of Technology)MIT
Product
Kerberos 5
Default Status
unaffected
Versions
Affected
  • From 1.18 before 1.22.3 (custom)
Problem Types
TypeCWE IDDescription
CWECWE-476CWE-476 NULL Pointer Dereference
Type: CWE
CWE ID: CWE-476
Description: CWE-476 NULL Pointer Dereference
Metrics
VersionBase scoreBase severityVector
3.15.9MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Version: 3.1
Base score: 5.9
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://web.mit.edu/kerberos/advisories/
N/A
https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html
N/A
https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f
N/A
Hyperlink: https://web.mit.edu/kerberos/advisories/
Resource: N/A
Hyperlink: https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html
Resource: N/A
Hyperlink: https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f
Resource: N/A
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html
exploit
Hyperlink: https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html
Resource:
exploit
Details not found