Disclosure summary
In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a large update size to resize() in kdb_log.c. An authenticated attacker can cause an out-of-bounds write and kadmind daemon crash.
Source-reported weakness categories
CWE-190
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
Microsoft Security Updates (CVRF) · 2026-Jan
Open original source · Updated Feb 18, 2026
In MIT Kerberos 5 (aka krb5) before 1.22 (with incremental propagation), there is an integer overflow for a large update size to resize() in kdb_log.c. An authenticated attacker can cause an out-of-bounds write and kadmind daemon crash.
Maximum of vendor-reported product scores; products and fixed builds are associations, not a universal affected-version statement.
Microsoft maximum product score: 7.1
| Vendor | Product / association | Version / bounds |
|---|---|---|
| Microsoft update guide | azl3 krb5 1.21.3-2 on Azure Linux 3.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 krb5 1.19.4-4 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | cbl2 krb5 1.19.4-5 on CBL Mariner 2.0 | (MSRC status code 3) |
| Microsoft update guide | azl3 krb5 1.21.3-3 on Azure Linux 3.0 | (MSRC status code 3) |
Vendor remediation references
- CBL-Mariner Releases · build 1.19.4-5 · product IDs 20903-17086
- Vendor guidance · product IDs 20903-17086
- CBL-Mariner Releases · build 1.21.3-3 · product IDs 20902-17084
- Vendor guidance · product IDs 20902-17084
Original records & references
- NIST NVD record
- CVE Program record
- msrc.microsoft.com — Vendor advisory
PUBLISHED 2026-01-20T20:04:46-05:00
MODIFIED 2026-02-18T10:03:11-05:00
INGESTED 2026-10-08T12:45:20-04:00