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CVE-2026-119079— Krb5: mit krb5 kdc unauthenticated cpu dos via quadratic asn.1 sequence of decoding

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 MIT Kerberos 5（简称 krb5）1.11 及更高版本的 文件中， 函数每次仅将解码后的元素数组扩展一个条目。这一实现使得远程攻击者能够通过 TCP 发送包含大量元素的 SEQUENCE OF 字段的未认证 AS-REQ 或 TGS-REQ 请求，从而导致拒绝服务（表现为 KDC 的 CPU 资源耗尽）。

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 6

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
Red Hat Red Hat Hardened Images any affected
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I. Basic Information for CVE-2026-119079

Vulnerability Information
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Vulnerability Title
Krb5: mit krb5 kdc unauthenticated cpu dos via quadratic asn.1 sequence of decoding
Source: CVE Program / CVE List V5
Vulnerability Description
decode_sequence_of() in lib/krb5/asn.1/asn1_encode.c in MIT Kerberos 5 (aka krb5) 1.11 and later grows the decoded element array one entry at a time, which allows remote attackers to cause a denial of service (CPU consumption in the KDC) by sending an unauthenticated AS-REQ or TGS-REQ with a large number of elements in a SEQUENCE OF field over TCP.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序：早期放大攻击
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/a:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:rhel_els:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/a:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/a:redhat:enterprise_linux:9
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-119079

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III. Intelligence Information for CVE-2026-119079

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Other References for CVE-2026-119079 (2)

Same Patch Batch · Red Hat · 2026-11-09 · 22 CVEs total

CVE-2026-12977 8.8 HIGH Org.wildfly.core/wildfly-server: wildfly: rbac bypass in wildfly deployment-operation hand
CVE-2026-19706 8.3 HIGH Openshift/installer: openshift installer: unconditional csr approval during agent-based in
CVE-2026-119610 8.2 HIGH Gstreamer1-plugins-good: gstreamer1-plugins-good: out-of-bounds heap read in mtap16/mtap24
CVE-2026-112323 7.5 HIGH Krb5: mit krb5 kadmind unauthenticated memory exhaustion via failed auth_gssapi_init reque
CVE-2026-121629 7.5 HIGH Gst-plugins-good: gst-plugins-good: local file disclosure via unvalidated file:// uris in
CVE-2026-112322 7.5 HIGH Krb5: mit krb5 kadmind unauthenticated cpu dos via auth_gssapi client states cleanup
CVE-2026-112320 7.5 HIGH Krb5: mit krb5 kadmind unauthenticated memory leak dos via gss-rpc auth flavor switching
CVE-2026-112321 7.5 HIGH Krb5: mit krb5 kadmind unauthenticated memory leak dos via auth_gssapi_init error paths
CVE-2026-112314 7.5 HIGH Krb5: mit krb5 gss-rpc client memory leak on xid mismatch retries
CVE-2026-84503 6.7 MEDIUM Ansible-core: ansible-core: ansible.builtin.git invokes git without a `--` separator, allo
CVE-2026-112316 6.5 MEDIUM Krb5: mit krb5 kadmind authenticated memory leak dos in xdr_krb5_tl_data() decode failure
CVE-2026-112318 6.5 MEDIUM Krb5: mit krb5 kadmind authenticated dos exploiting dereference of null policy name pointe
CVE-2026-112319 6.5 MEDIUM Krb5: mit krb5 kadmind authenticated memory exhaustion dos via unbounded rpc xdr allocatio
CVE-2026-125040 6.5 MEDIUM Gst-plugins-base: gst-plugins-base: quadratic regex processing in srt/webvtt subtitle pars
CVE-2026-121611 6.5 MEDIUM Gstreamer1-plugins-bad-free: gst-plugins-bad: use of uninitialized gsth265hrdparams in gst
CVE-2026-121601 6.1 MEDIUM Gstreamer1-plugins-bad-free: gstreamer1-plugins-bad-free: out-of-bounds read in mxfdemux v
CVE-2026-122056 5.9 MEDIUM Openscap: one-byte heap buffer overflow in sds-compose may lead to denial-of-service
CVE-2026-125041 5.5 MEDIUM Gst-plugins-good: gst-plugins-good: qtdemux out-of-bounds heap read from invalid uncompres
CVE-2026-112317 5.3 MEDIUM Krb5: mit krb5 kdc unauthenticated memory leak dos in kdb keytab key decryption error path
CVE-2026-112315 5.3 MEDIUM Krb5: mit krb5 kadmind unauthenticated memory leak dos in rpcsec_gss buffer decode failure

Showing top 20 of 22 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-408