CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-112323 Krb5: mit krb5 kadmind unauthenticated memory exhaustion via failed auth_gssapi_init requests
High (7.5) in red hat. EPSS 0.9% estimated probability of exploitation activity in the next 30 days.
On this page
The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) 1.5.2 and later allows remote attackers to cause a denial of service (memory exhaustion in kadmind) by sending repeated failed AUTH_GSSAPI_INIT requests. Each failed request allocates client state that is only freed after a 15-minute expiration timeout, allowing an attacker to accumulate memory faster than it is reclaimed.
Severity
- EPSS
- 0.9% estimated probability of exploitation activity in the next 30 days; 59th 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
Ask an AI about this CVE
Show the prompt
Explain CVE-2026-112323 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-112323?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-112323?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-112323 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Badge for a README or a site
An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:
[](https://cve.bz/cve/CVE-2026-112323)
HTML:
<a href="https://cve.bz/cve/CVE-2026-112323"><img src="https://cve.bz/cve/badge/CVE-2026-112323.svg" alt="CVE-2026-112323"></a>
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-2026-112323 |
| Ubuntu | 20.04:LTS, 22.04:LTS, 24.04:LTS and 5 more | krb5 | no fix listed | UBUNTU-CVE-2026-112323 |
| 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-2026-112323 |
| Azure Linux | 3 | krb5 | no fix listed | AZL-113525 |
| Alpaquita | 23 | krb5 | 1.20.2-r5 | BELL-CVE-2026-112323 |
| Alpaquita | 25, stream | krb5 | 1.22.3-r0 | BELL-CVE-2026-112323 |
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 Important because an unauthenticated remote attacker can cause sustained memory exhaustion leading to a denial of service on reachable administrative endpoints without requiring valid credentials. It does not qualify for a Critical rating because the flaw does not facilitate arbitrary code execution or compromise data integrity and confidentiality. On standard Red Hat Enterprise Linux installations, the affected kadmind service is not enabled by default and is typically confined to dedicated Kerberos Key Distribution Center (KDC) environments.
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-2026-112323.
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-2026-112323
- https://bugzilla.redhat.com/show_bug.cgi?id=2478440