CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2026-112319 Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocation
Medium (6.5) in red hat. EPSS 1.0% estimated probability of exploitation activity in the next 30 days.
On this page
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.
Severity
- EPSS
- 1.0% estimated probability of exploitation activity in the next 30 days; 63rd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: PoC · Automatable: no · Technical impact: partial, assessed 2026-11-09. 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-770 Allocation of Resources Without Limits or Throttling
- 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-2026-112319 |
| Ubuntu | 20.04:LTS, 22.04:LTS, 24.04:LTS and 5 more | krb5 | no fix listed | UBUNTU-CVE-2026-112319 |
| 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-2026-112319 |
| Azure Linux | 3 | krb5 | no fix listed | AZL-113528 |
| Alpaquita | 23 | krb5 | 1.20.2-r5 | BELL-CVE-2026-112319 |
| Alpaquita | 25, stream | krb5 | 1.22.3-r0 | BELL-CVE-2026-112319 |
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 having an Important severity because an authenticated remote client can trigger repeated unbounded memory allocations and memory leaks in services relying on Kerberos RPC, causing denial of service. While exploitation requires establishing a valid Kerberos security context, the flaw can be leveraged against network-facing services such as the Kerberos administration daemon (kadmind). Because the issue only affects process availability and does not permit unauthorized data disclosure, data alteration, or code execution, it does not meet the threshold for Critical.
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.
| 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-2026-112319.
Attack patterns (CAPEC)
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-770 (20).
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-2026-112319
- https://bugzilla.redhat.com/show_bug.cgi?id=2478684