7.5

CVE-2026-40356

Exploit
In MIT Kerberos 5 (aka krb5) before 1.22.3, there is an integer underflow and resultant out-of-bounds read 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, possibly causing the process to terminate in parse_message.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Mit ≫ Kerberos 5 Version >= 1.18.0 <= 1.22.2
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.5% 0.393
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.5 3.9 3.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve@mitre.org 5.9 2.2 3.6
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-191 Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

https://web.mit.edu/kerberos/advisories/
Vendor Advisory
https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html
Patch
Third Party Advisory
Exploit
https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f
Patch