Is CVE-2026-107708 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-107708 being exploited in the wild.

How severe is CVE-2026-107708?

Medium severity, with a CVSS score of 4.9, published 8 October 2026.

Is there a fix for CVE-2026-107708?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-107708 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-107708?

Check whether you run Mit Krb5 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-107708: MIT krb5 NULL pointer dereference in KDC get_pac_princ_with_realm

CVE-2026-107708 · Severity: medium · CVSS 4.9 · Published 2026-10-08

MIT krb5 is an implementation of the Kerberos authentication protocol used to verify user identities in enterprise networks. A vulnerability in the KDC (Key Distribution Center) allows a compromised or malicious cross-realm KDC to send a specially crafted authentication request that crashes the krb5kdc service, preventing users from authenticating and causing a denial of service.

Technologies: Mit Krb5. Vendors: Mit.

Quick answers

Is CVE-2026-107708 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-107708 being exploited in the wild.
How severe is CVE-2026-107708?: Medium severity, with a CVSS score of 4.9, published 8 October 2026.
Which products and versions are affected?: Mit Krb5 through 1.22.2.
Is there a fix for CVE-2026-107708?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-107708 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-107708?: Check whether you run Mit Krb5 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The KDC's get_pac_princ_with_realm() function contains a NULL pointer dereference when processing S4U2Proxy (service-for-user-to-proxy) requests with a PAC (Privilege Attribute Certificate) containing a malformed client name. The function returns success while leaving the client principal NULL, which is subsequently dereferenced, causing krb5kdc to crash. Attack requires network access to the KDC and a trust relationship with a cross-realm KDC.

Affected products

MIT krb5 through 1.22.2

Timeline

2026-10-08: disclosed

References

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