Medium severity4.9NVD Advisory· Published Oct 8, 2026· Updated Oct 8, 2026
CVE-2026-107708
CVE-2026-107708
Description
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.
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/krb5/krb5/blob/krb5-1.22.2-final/src/kdc/kdc_util.cnvd
- github.com/krb5/krb5/commit/a88a18cafa1040a0c4f9c8d08288fc98831ec86dnvd
- github.com/krb5/krb5/commit/f6e2c397ceda6467ebbaab8ed66d4895c9f1d6a7nvd
- github.com/krb5/krb5/pull/1510nvd
- www.vulncheck.com/advisories/mit-krb5-through-1.22.2-kdc-null-pointer-dereference-via-s4u2proxy-pacnvd
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