CVSS 3.1
5.3 mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2026-112317 Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path
Medium (5.3) in red hat. EPSS 0.8% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
- EPSS
- 0.8% estimated probability of exploitation activity in the next 30 days; 56th percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: none · Automatable: yes · Technical impact: partial, assessed 2026-11-14. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-772 Missing Release of Resource after Effective Lifetime
- Published
- Modified
- Assigned by
- redhat (CNA)
- NVD analysis
- Awaiting analysis
- Record from
- the NVD, synced
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Affected
- red hat:red hat enterprise linux 10
- red hat:red hat enterprise linux 10.2 extended update support
- red hat:red hat enterprise linux 6
- red hat:red hat enterprise linux 7
- red hat:red hat enterprise linux 8
- red hat:red hat enterprise linux 9
- red hat:red hat enterprise linux 9.8 extended update support
- red hat:red hat hardened images
Versions
From the CNA's record in the CVE List.
Fixed in
| Product | Fixed in |
|---|---|
| Red Hat Enterprise Linux 10 | 0:1.21.3-11.el10_3.2 |
| Red Hat Enterprise Linux 10.2 Extended Update Support | 0:1.21.3-10.el10_2.2 |
| Red Hat Enterprise Linux 9 | 0:1.21.1-10.el9_9.2 |
| Red Hat Enterprise Linux 9.8 Extended Update Support | 0:1.21.1-10.el9_8.3 |
| Red Hat Hardened Images | 1.22.3-0.1.hum1 |
Fix and patched versions
- Red Hat Red Hat Enterprise Linux 10: fixed in 0:1.21.3-11.el10_3.2
- Red Hat Red Hat Enterprise Linux 10.2 Extended Update Support: fixed in 0:1.21.3-10.el10_2.2
- Red Hat Red Hat Enterprise Linux 9: fixed in 0:1.21.1-10.el9_9.2
- Red Hat Red Hat Enterprise Linux 9.8 Extended Update Support: fixed in 0:1.21.1-10.el9_8.3
- Red Hat Red Hat Hardened Images: fixed in 1.22.3-0.1.hum1
- Red Hat, Rocky Linux, Alpine, Alpaquita: fixed package versions per release
Linux distributions
| Distribution | Release | Package | Fixed in | Advisory |
|---|---|---|---|---|
| Debian | 12, 13, 14 | krb5 | no fix listed | DEBIAN-CVE-2026-112317 |
| Ubuntu | 20.04:LTS, 22.04:LTS, 24.04:LTS and 5 more | krb5 | no fix listed | UBUNTU-CVE-2026-112317 |
| Red Hat | enterprise_linux:9::appstream | krb5-devel, krb5-debuginfo, krb5-debugsource and 7 more | 0:1.21.1-10.el9_9.2 | RHSA-2026:99715 |
| Red Hat | enterprise_linux:9::baseos | krb5, libkadm5, krb5-libs and 14 more | 0:1.21.1-10.el9_9.2 | RHSA-2026:99715 |
| Red Hat | enterprise_linux:10.3 | krb5, libkadm5, krb5-libs and 15 more | 0:1.21.3-11.el10_3.2 | RHSA-2026:99624 |
| Red Hat | enterprise_linux_eus:10.2 | krb5, libkadm5, krb5-libs and 15 more | 0:1.21.3-10.el10_2.2 | RHSA-2026:99625 |
| Red Hat | hummingbird:1 | krb5, libkadm5, krb5-libs and 7 more | 0:1.22.3-0.1.hum1 | RHSA-2026:97811 |
| Red Hat | rhel_eus:9.8::appstream | krb5-devel, krb5-debuginfo, krb5-debugsource and 7 more | 0:1.21.1-10.el9_8.3 | RHSA-2026:99716 |
| Red Hat | rhel_eus:9.8::baseos | krb5, libkadm5, krb5-libs and 14 more | 0:1.21.1-10.el9_8.3 | RHSA-2026:99716 |
| Rocky Linux | 9 | libkadm5, krb5-libs, krb5-devel and 14 more | 0:1.21.1-10.el9_9.2 | RLSA-2026:99715 |
| Rocky Linux | 10 | libkadm5, krb5-libs, krb5-devel and 14 more | 0:1.21.3-11.el10_3.2 | RLSA-2026:99624 |
| Alpine | v3.23, v3.24 | krb5 | 1.22.3-r0 | ALPINE-CVE-2026-112317 |
| Azure Linux | 3 | krb5 | no fix listed | AZL-113537 |
| Alpaquita | 23 | krb5 | 1.20.2-r5 | BELL-CVE-2026-112317 |
| Alpaquita | 25, stream | krb5 | 1.22.3-r0 | BELL-CVE-2026-112317 |
From the distributions' data via OSV.dev: the Debian Security Tracker; Ubuntu Security Notices © Canonical Ltd., CC BY-SA 4.0; Red Hat Security Data © Red Hat, Inc., CC BY 4.0; Rocky Linux's errata, BSD-3-Clause; the Alpine secdb, CC BY-SA 4.0; Microsoft's Azure Linux vulnerability data, MIT; BellSoft's OSV database, MIT. Modified: reformatted and linked to CVE records. Credits. On the distributions' own pages: Debian · Ubuntu · Red Hat · Alpine · Alpaquita.
Red Hat
Red Hat rates this Important.
This vulnerability is rated as an Important severity flaw because an unauthenticated remote attacker can exhaust service memory and cause a denial of service of KDC and/or kadmind services. Although the flaw does not facilitate arbitrary code execution or leak sensitive data, repeated malformed requests can steadily deplete process resources until availability is interrupted.
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.
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | krb5-0:1.21.3-11.el10_3.2 | Fixed 2026-11-12 | RHSA-2026:99624 |
| Red Hat Enterprise Linux 10.2 Extended Update Support | krb5-0:1.21.3-10.el10_2.2 | Fixed 2026-11-12 | RHSA-2026:99625 |
| Red Hat Enterprise Linux 9 | krb5-0:1.21.1-10.el9_9.2 | Fixed 2026-11-12 | RHSA-2026:99715 |
| Red Hat Enterprise Linux 9.8 Extended Update Support | krb5-0:1.21.1-10.el9_8.3 | Fixed 2026-11-12 | RHSA-2026:99716 |
| Red Hat Enterprise Linux 6 | krb5 | Out of support scope | |
| Red Hat Enterprise Linux 7 | krb5 | Affected | |
| Red Hat Enterprise Linux 8 | krb5 | Affected | |
| Red Hat Hardened Images | krb5 | Affected |
Contains Red Hat Security Data © Red Hat, Inc., licensed under CC BY 4.0. Source: https://access.redhat.com/security/data. Modified: reformatted. Red Hat's page for CVE-2026-112317.
Attack patterns (CAPEC)
- CAPEC-469 HTTP DoS Severity: Low
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.
References
- https://access.redhat.com/errata/RHSA-2026:97811
- https://access.redhat.com/errata/RHSA-2026:99624
- https://access.redhat.com/errata/RHSA-2026:99625
- https://access.redhat.com/errata/RHSA-2026:99715
- https://access.redhat.com/errata/RHSA-2026:99716
- https://access.redhat.com/security/cve/CVE-2026-112317
- https://bugzilla.redhat.com/show_bug.cgi?id=2479209