# CVE-2026-112317: Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path

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

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.

## Remediation

- workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. (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: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L; source: CNA: redhat

- CVSS 3.1: 5.3 (medium); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L; source: NVD: secalert@redhat.com

- CISA KEV: No listing in collected sources

- EPSS: 0.58% as of 2026-11-10; percentile 47.90%

- SSVC: Not available

- Weaknesses: CWE-772

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

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

- https://access.redhat.com/security/cve/CVE-2026-112317 (CNA: redhat; vdb-entry, x_refsource_REDHAT)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479209 (CNA: redhat; issue-tracking, x_refsource_REDHAT)

- https://access.redhat.com/security/cve/CVE-2026-112317 (secalert@redhat.com)

- https://bugzilla.redhat.com/show_bug.cgi?id=2479209 (secalert@redhat.com)

## Provenance

- CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2026-112317; retrieved 2026-11-12; source updated 2026-11-12

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-112317; retrieved 2026-11-10; source updated 2026-11-09

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-112317; retrieved 2026-11-11; source updated Not reported

Revision: e7f963b31a4bef097ac4fca0662c651fe9e3bf1f423b76ab17da205b7a57313b

Canonical: https://y2.dev/cve/CVE-2026-112317

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