CVE-2026-112321 (CVSS 7.5)

Description

The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) does not free decoded arguments on certain error paths, which allows remote attackers to cause a denial of service (memory exhaustion in kadmind) via crafted AUTH_GSSAPI_INIT requests that trigger authentication failures.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0090

Probability of exploitation

0.60%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-772 CWE-772

References

Other References

https://access.redhat.com/errata/RHSA-2026:99624 https://access.redhat.com/errata/RHSA-2026:99625 https://access.redhat.com/errata/RHSA-2026:99715 https://access.redhat.com/errata/RHSA-2026:99716 https://access.redhat.com/security/cve/CVE-2026-112321 https://bugzilla.redhat.com/show_bug.cgi?id=2478448

Frequently Asked Questions

What is CVE-2026-112321? +

The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) does not free decoded arguments on certain error paths, which allows remote attackers to cause a denial of service (memory exhaustion in kadmind) via crafted AUTH_GSSAPI_INIT requests that trigger authentication failures. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-112321? +

CVE-2026-112321 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0090, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-112321? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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