---
id: "CVE-2026-112322"
page: "https://infrastack.ai/live/CVE-2026-112322"
kind: "vulnerability"
aliases: ["CVE-2026-112322"]
title: "MIT Kerberos: client cleanup lets remote attackers exhaust CPU in kadmind"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "runtime"
products: [{"name": "krb5", "fixed": ["1.22.3"], "affected": "< 1.22.3 (lower bound not stated by MIT)", "ecosystem": "vendor"}]
ecosystems: []
tags: ["kadmind", "kerberos", "mit-kerberos", "runtime", "self-hosted"]
not_affected_if: ["no-kadmind"]
published_at: "2026-11-09T19:16:41+00:00"
first_seen_at: "2026-11-09T19:28:13+00:00"
updated_at: "2026-11-09T19:37:16+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112322", "first_seen_at": "2026-11-09T19:28:13+00:00"}, {"source": "analyst", "url": "https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt", "first_seen_at": "2026-11-09T19:37:16+00:00", "cites": ["https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt", "https://nvd.nist.gov/vuln/detail/CVE-2026-112322"]}]
exploit_sources: []
---

# MIT Kerberos: client cleanup lets remote attackers exhaust CPU in kadmind

Link for people: https://infrastack.ai/live/CVE-2026-112322 (this .md is for agents)

MIT Kerberos 5 restarts a client-list scan after each removal in svc_auth_gssapi.c, making cleanup quadratic in cost. A remote attacker who accumulates many AUTH_GSSAPI client entries can make kadmind consume CPU and deny service.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:krb5 affected < 1.22.3 (lower bound not stated by MIT) fixed 1.22.3

## How to check

Run kadmind -h or check your krb5 package version (e.g. krb5-config --version); anything older than 1.22.3 that runs kadmind is not fixed. Affected version floor is not stated by MIT.

## Fix

Update MIT krb5 to 1.22.3 (MITKRB5-SA-2026-001 lists this CVE among the DoS fixes in that release).

## Timeline

- 2026-11-09T19:28:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112322
- 2026-11-09T19:37:16+00:00 analyst https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt — MIT advisory MITKRB5-SA-2026-001 lists CVE-2026-112322 as DoS fixed in 1.22.3; it gives no per-CVE detail, affected floor, or default reachability of AUTH_GSSAPI. Web search was out of credits.

## Documents

- [advisory] MITKRB5-SA-2026-001: Multiple vulnerabilities fixed in 1.22.3 https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt
- [describes] NVD CVE-2026-112322 https://nvd.nist.gov/vuln/detail/CVE-2026-112322

## From the sources

clean_client() in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) restarts its scan from the head of the client list after each removal, resulting in quadratic CPU cost. Remote attackers can cause a denial of service (CPU consumption in kadmind) by accumulating a large number of AUTH_GSSAPI client entries.

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