---
id: "CVE-2026-112317"
page: "https://infrastack.ai/live/CVE-2026-112317"
kind: "vulnerability"
aliases: ["CVE-2026-112317"]
title: "MIT Kerberos: failed key decryption leaks memory, letting remote requests exhaust KDC"
severity: "medium"
cvss: 5.3
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "krb5", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["kadmind", "kdc", "kerberos", "krb5", "package", "self-hosted"]
not_affected_if: ["client-only", "other-kerberos-implementation"]
published_at: "2026-11-09T19:16:40+00:00"
first_seen_at: "2026-11-09T19:28:13+00:00"
updated_at: "2026-11-09T19:32:10+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112317", "first_seen_at": "2026-11-09T19:28:13+00:00"}]
exploit_sources: []
---

# MIT Kerberos: failed key decryption leaks memory, letting remote requests exhaust KDC

Link for people: https://infrastack.ai/live/CVE-2026-112317 (this .md is for agents)

In MIT Kerberos 5 (krb5) 1.2.8 and later, krb5_ktkdb_get_entry() does not free decrypted key material when a post-decryption check fails. Remote attackers who repeatedly trigger key decryption failures can cause a memory leak in the KDC or kadmind, leading to denial of service.

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

## Affected

- vendor:krb5 affected range not listed fixed no fixed version listed

## Timeline

- 2026-11-09T19:28:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112317

## From the sources

krb5_ktkdb_get_entry() in lib/kdb/keytab.c in MIT Kerberos 5 (aka krb5) 1.2.8 and later does not free decrypted key material when a post-decryption check fails, which allows remote attackers to cause a denial of service (memory leak in the KDC or kadmind) via requests that repeatedly trigger key decryption failures.

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