Red Hat Enterprise Linux/Hardened Images ASN.1 asn1_encode.c decode_sequence_of denial of service

Summaryinfo

A vulnerability classified as critical was found in Red Hat Enterprise Linux and Hardened Images. The affected element is the function decode_sequence_of of the file lib/krb5/asn.1/asn1_encode.c of the component ASN.1. The manipulation results in denial of service. This vulnerability is known as CVE-2026-119079. It is possible to launch the attack remotely. No exploit is available.

Detailsinfo

A vulnerability was found in Red Hat Enterprise Linux and Hardened Images (version unknown). It has been classified as critical. Affected is the function decode_sequence_of of the file lib/krb5/asn.1/asn1_encode.c of the component ASN.1. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. CVE summarizes:

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.

The advisory is available at access.redhat.com. This vulnerability is traded as CVE-2026-119079 since 10/29/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/09/2026). This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Operating System

Vendor

• Red Hat

Name

• Enterprise Linux
• Hardened Images

License

• commercial

Website

• Vendor: https://www.redhat.com/

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