---
id: "CVE-2026-112314"
page: "https://infrastack.ai/live/CVE-2026-112314"
kind: "vulnerability"
aliases: ["CVE-2026-112314"]
title: "MIT Kerberos 5: RPC client leaks memory, letting remote attackers exhaust resources"
severity: "high"
cvss: 7.5
epss: null
exploited: false
status: "open"
category: "package"
products: [{"name": "krb5", "fixed": ["1.22.3"], "affected": "< 1.22.3 (earliest affected release unknown)", "ecosystem": "vendor"}]
ecosystems: []
tags: ["gss-rpc", "kerberos", "krb5", "linux", "package"]
not_affected_if: ["no-gss-rpc-clients"]
published_at: "2026-11-09T19:16:39+00:00"
first_seen_at: "2026-11-09T19:28:13+00:00"
updated_at: "2026-11-09T19:37:10+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-112314", "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": "2026-11-09T19:37:10+00:00", "cites": ["https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt"]}]
exploit_sources: []
---

# MIT Kerberos 5: RPC client leaks memory, letting remote attackers exhaust resources

Link for people: https://infrastack.ai/live/CVE-2026-112314 (this .md is for agents)

The GSS-RPC client in MIT Kerberos 5 (krb5) does not free the RPC reply verifier between retries. A remote attacker who injects RPC replies with mismatched XIDs or triggers authentication retries can make the client leak memory, causing denial of service.

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

## Affected

- vendor:krb5 affected < 1.22.3 (earliest affected release unknown) fixed 1.22.3

## How to check

- Run krb5-config --version or klist -V; versions before 1.22.3 are unpatched per MITKRB5-SA-2026-001 (the advisory does not list the earliest affected release).
- Check whether anything links libgssrpc (e.g. ldd on kadmin or custom GSS-RPC clients); if nothing does, you can skip this.
- Distro packages may backport the fix: check the package changelog for CVE-2026-112314.

## Fix

Upgrade MIT krb5 to 1.22.3 or later (MITKRB5-SA-2026-001), or a distro build that backports it.

## Timeline

- 2026-11-09T19:28:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-112314
- 2026-11-09T19:37:10+00:00 analyst https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt — MIT advisory MITKRB5-SA-2026-001 lists CVE-2026-112314 among DoS fixes in 1.22.3; it gives no per-CVE description or affected range, so the bug details come from NVD text only and are unverified. web-cli had no Exa credits. Fixed version verified; affected range unknown.

## Documents

- [advisory] MITKRB5-SA-2026-001: Multiple vulnerabilities fixed in 1.22.3 https://web.mit.edu/kerberos/advisories/MITKRB5-SA-2026-001.txt

## From the sources

clnttcp_call() in lib/rpc/clnt_tcp.c in MIT Kerberos 5 (aka krb5) does not free the RPC reply verifier between retries, which allows remote attackers to cause a denial of service (memory leak in GSS-RPC client programs) by injecting RPC replies with mismatched XIDs or by triggering authentication retries.

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