Highest advisory severityMedium 2 vendors · 2 advisories

CVE-2026-40355

Denial of Service via NULL pointer dereference in NegoEx mechanism

CVE-2026-40355: Denial of Service via NULL pointer dereference in NegoEx mechanism. Not in the CISA KEV catalog. Medium advisory severity (CVSS 5.9, Red Hat).

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-40355 key facts

CISA KEV: Not listed (catalog checked Oct 30, 2026)
Highest advisory severity: Medium
CVSS base score: 5.9 (Red Hat)
Weakness: CWE-476
Fixed releases: Red Hat: RHSA-2026:12220
Vendor advisories: 2 from NetApp, Red Hat
VulniPulse record: Published Apr 28, 2026 · Updated Sep 21, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-40355; bulletin-wide values are not repeated here.

Is CVE-2026-40355 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-40355 is not in the CISA KEV catalog (checked Oct 30, 2026) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-40355?

Upgrade to a fixed release named by the vendor:

Red Hat: RHSA-2026:12220

Update the affected package(s) to the fixed version shipped in RHSA-2026:12220 (`sudo dnf update` / `yum update`). (Red Hat)

Vendor advisory comparison

NetApp

1 advisory

Advisory severityMedium5.9
Medium [CVE-2026-40355 +1] April 2026 Kerberos Vulnerabilities in NetApp Products
NTAP-20260911-0018Source published Sep 11, 2026Source updated Sep 21, 2026
This bulletin covers 2 CVEs. The products, versions, score and guidance below describe the bulletin; check its source for applicability to this specific CVE.
Kerberos versions prior to 1.22.3 are susceptible to vulnerabilities which when successfully exploited could lead to Denial of Service (DoS). Successful exploitation of these vulnerabilities could lead to Denial of Service (DoS). Affected products: NetApp HCI Baseboard Management Controller (BMC) - H610S. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.
Affected products in this advisory
NetApp HCI Baseboard Management Controller (BMC) - H610S
Source-reported affected versions
1.22.3
Source-reported fixed versions
No fixed-version detail extracted. This does not mean no fix exists.
Mitigation guidance
NetApp HCI Baseboard Management Controller (BMC) - H610S has no planned fix; migrate to a supported release or product and consult NetApp's end-of-support notice.
Full advisory and evidence Open source bulletin

Red Hat

1 advisory

Advisory severityMedium5.9
Medium [CVE-2026-40355] Denial of Service via NULL pointer dereference in NegoEx mechanism
CVE-2026-40355Source published Apr 28, 2026
Denial of Service via NULL pointer dereference in NegoEx mechanism. Red Hat rates this moderate (CVSS 5.9). Weakness: CWE-476. Affected package(s): krb5-main, insights-proxy/insights-proxy-container-rhel9:1780420428, rhui5/haproxy-rhel9:1779798164, krb5, discovery/discovery-ui-rhel9:1782166952, discovery/discovery-server-rhel9:1782159791. Resolved in Red Hat advisory RHSA-2026:12220 — update the affected packages (`sudo dnf update`).
Related products — impact not confirmed
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 1
krb5-main
4 more entries in the full advisory.
Source-reported affected versions
krb5-main-1.22.2-7.hum1
insights-proxy/insights-proxy-container-rhel9:1780420428
rhui5/haproxy-rhel9:1779798164
krb5-0:1.21.1-10.el9_8
7 more entries in the full advisory.
Source-reported fixed versions
RHSA-2026:12220
Mitigation guidance
Update the affected package(s) to the fixed version shipped in RHSA-2026:12220 (`sudo dnf update` / `yum update`).
Full advisory and evidence Open source bulletin

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