MIT krb5 through 1.22.2 KDC NULL Pointer Dereference via S4U2Proxy PAC
MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC's get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.
CVE-2026-107708
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-107708
krb5
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/krb5/krb5",
"vendor": "MIT",
"product": "krb5",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "custom",
"lessThanOrEqual": "1.22.2"
}
],
"packageURL": "pkg:github/krb5/krb5",
"collectionURL": "https://github.com/krb5/krb5",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-107708
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #21334 · Revision 1
- Added to Heist Feed
- Publisher date