CVE-2026-112320 (CVSS 7.5)

Description

The GSS-RPC transport layer in MIT Kerberos 5 (aka krb5) 1.4 and later does not release the previous authentication context when a client switches from an RPCSEC_GSS or AUTH_GSSAPI flavor to a non-GSS flavor on the same TCP connection. This allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by repeatedly establishing and abandoning GSS authentication contexts.

Is your site exposed to CVE-2026-112320?

Run a free security scan — no signup, results in seconds.

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

0.0073

Probability of exploitation

0.55%

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-2026-112320 https://bugzilla.redhat.com/show_bug.cgi?id=2478449

Frequently Asked Questions

What is CVE-2026-112320? +

The GSS-RPC transport layer in MIT Kerberos 5 (aka krb5) 1.4 and later does not release the previous authentication context when a client switches from an RPCSEC_GSS or AUTH_GSSAPI flavor to a non-GSS flavor on the same TCP connection. This allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by repeatedly establishing and abandoning GSS authentication contexts. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-112320? +

CVE-2026-112320 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 0.0073, placing it in the 1th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-112320? +

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.

Related Vulnerabilities

CVE-2026-59951

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.8.0 …

CVE-2025-3864

Hackney fails to properly release HTTP connections to the pool after handling 307 Temporary Redirect responses. Remote attackers can exploit …

CVE-2026-69664

Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial …

CVE-2026-104112

A missing release of resources in the illumos name service cache daemon (nscd) allows a local user to exhaust kernel …

CVE-2026-71380

Missing Release of Resource after Effective Lifetime vulnerability in Erlang/OTP inets httpd allows an unauthenticated remote attacker to cause denial …

CVE-2026-35227

An unauthenticated remote attacker may exhaust all available TCP connections in the CODESYS Modbus TCP Server stack if a race …