# CVE-2026-112319: Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocation

Status: published. Published: 2026-11-09. Updated: 2026-11-12.

The GSS-RPC layer in MIT Kerberos 5 (aka krb5) does not enforce size limits on XDR-decoded data, which allows remote authenticated users to cause a denial of service (memory exhaustion or excessive CPU consumption in kadmind) via crafted RPC requests that trigger unbounded memory allocations during XDR decoding.

## Remediation

- workaround: Restrict network access to kadmind to trusted hosts, or disable it in favor of kadmin.local server-side command line tool for administration operations if possible. (source: CNA: redhat)

## Affected products and versions

- Red Hat / Red Hat Enterprise Linux 10 (krb5): ≥ 0:1.21.3-11.el10_3.2; < * (unaffected, rpm). Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 6 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 7 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 8 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Enterprise Linux 9 (krb5): Version range not reported. Source: CNA: redhat
- Red Hat / Red Hat Hardened Images (krb5): Version range not reported. Source: CNA: redhat

## Severity and prioritization

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: CNA: redhat

- CVSS 3.1: 6.5 (medium); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.74% as of 2026-11-10; percentile 54.99%

- SSVC: exploitation poc; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-770

## Exploit evidence

- exploit: https://bugzilla.redhat.com/show_bug.cgi?id=2478684 (ADP: CISA-ADP)

## References

- https://access.redhat.com/errata/RHSA-2026:99624 (CNA: redhat; vendor-advisory, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-112319 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478684 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478684 (ADP: CISA-ADP; exploit)

- https://access.redhat.com/security/cve/CVE-2026-112319 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478684 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2478684 (134c704f-9b21-4f2e-91b3-4a467353bcc0)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-112319; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112319; retrieved 2026-11-10; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-112319; retrieved 2026-11-11; source updated Not reported

Revision: 28159257b789ed7cdca52078e2996c29f6e183f21d837d03ce949e776c2ece1d

Canonical: https://y2.dev/cve/CVE-2026-112319

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