RHSA-2026:16799
Vulnerability from csaf_redhat - Published: 2026-05-13 06:00 - Updated: 2026-05-13 15:48Summary
Red Hat Security Advisory: krb5 security update
Severity
Important
Notes
Topic: An update for krb5 is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).
Security Fix(es):
* krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read (CVE-2026-40356)
* krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism (CVE-2026-40355)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in MIT Kerberos 5 (krb5). An unauthenticated remote attacker can exploit a NULL pointer dereference vulnerability by calling `gss_accept_sec_context()` on a system with a NegoEx mechanism registered. This can lead to the termination of the process, resulting in a Denial of Service (DoS).
5.9 (Medium)
Affected products
Fixed
80 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-0:1.18.2-34.el8_10.src | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-pkinit-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-server-ldap-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-workstation-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:libkadm5-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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Threats
Impact
Moderate
A flaw was found in MIT Kerberos 5 (krb5). An unauthenticated remote attacker can exploit an integer underflow and an out-of-bounds read vulnerability by calling `gss_accept_sec_context()` on a system with a NegoEx mechanism registered. This can lead to the process terminating, resulting in a Denial of Service (DoS).
5.9 (Medium)
Affected products
Fixed
80 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-0:1.18.2-34.el8_10.src | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-debugsource-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-devel-debuginfo-0:1.18.2-34.el8_10.x86_64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.aarch64 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.i686 | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.ppc64le | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.s390x | — |
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| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:krb5-libs-0:1.18.2-34.el8_10.x86_64 | — |
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Threats
Impact
Important
References
16 references
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"text": "An update for krb5 is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
"title": "Topic"
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{
"category": "general",
"text": "Kerberos is a network authentication system, which can improve the security of your network by eliminating the insecure practice of sending passwords over the network in unencrypted form. It allows clients and servers to authenticate to each other with the help of a trusted third party, the Kerberos key distribution center (KDC).\n\nSecurity Fix(es):\n\n* krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read (CVE-2026-40356)\n\n* krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism (CVE-2026-40355)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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"text": "krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism",
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"text": "Moderate: This flaw allows an unauthenticated remote attacker to cause a Denial of Service in MIT Kerberos 5 by triggering a NULL pointer dereference. Exploitation requires the NegoEx mechanism to be explicitly registered in the system\u0027s GSSAPI configuration, which is not a default state in all Red Hat environments.",
"title": "Statement"
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:16799"
},
{
"category": "workaround",
"details": "To mitigate this issue, remove the NegoEx mechanism registration from the system\u0027s GSSAPI configuration if it is not required. This can typically be achieved by removing or commenting out the relevant entry in `/etc/gss/mech`. A restart of services utilizing Kerberos might be necessary for the changes to take effect, which could impact Kerberos-dependent functionality.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "krb5: MIT Kerberos 5: Denial of Service via NULL pointer dereference in NegoEx mechanism"
},
{
"cve": "CVE-2026-40356",
"cwe": {
"id": "CWE-191",
"name": "Integer Underflow (Wrap or Wraparound)"
},
"discovery_date": "2026-04-28T07:01:37.543641+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2463368"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in MIT Kerberos 5 (krb5). An unauthenticated remote attacker can exploit an integer underflow and an out-of-bounds read vulnerability by calling `gss_accept_sec_context()` on a system with a NegoEx mechanism registered. This can lead to the process terminating, resulting in a Denial of Service (DoS).",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "An Important denial of service vulnerability exists in MIT Kerberos 5, allowing an unauthenticated remote attacker to terminate processes. This occurs on systems where the NegoEx mechanism is registered and an application invokes `gss_accept_sec_context()`, leading to an integer underflow and out-of-bounds read.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
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"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-40356"
},
{
"category": "external",
"summary": "RHBZ#2463368",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2463368"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-40356",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-40356"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-40356",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40356"
},
{
"category": "external",
"summary": "https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html",
"url": "https://cems.fun/2026/04/27/krb5-two-unauthenticated-network-vulnerabilities.html"
},
{
"category": "external",
"summary": "https://github.com/krb5/krb5/commit/2e75f0d9362fb979f5fc92829431a590a130929f",
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},
{
"category": "external",
"summary": "https://web.mit.edu/kerberos/advisories/",
"url": "https://web.mit.edu/kerberos/advisories/"
}
],
"release_date": "2026-04-28T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-05-13T06:00:07+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:16799"
},
{
"category": "workaround",
"details": "To mitigate this issue, ensure that the NegoEx mechanism is not registered in the `/etc/gss/mech` configuration file. Removing the corresponding entry from this file will prevent the vulnerable code path from being activated. This action may impact services that rely on the NegoEx GSS-API mechanism. A restart of affected Kerberos-dependent services may be required for the change to take effect.",
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{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 5.9,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "krb5: MIT Kerberos 5 (krb5): Denial of Service via integer underflow and out-of-bounds read"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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