SUSE-SU-2026:1816-1
Vulnerability from csaf_suse - Published: 2026-05-12 07:56 - Updated: 2026-05-12 07:56Summary
Security update for krb5
Severity
Moderate
Notes
Title of the patch: Security update for krb5
Description of the patch: This update for krb5 fixes the following issues
- CVE-2026-40355: Denial of Service via NULL pointer dereference in NegoEx mechanism (bsc#1263366).
- CVE-2026-40356: Denial of Service via integer underflow and out-of-bounds read (bsc#1263367).
Patchnames: SUSE-2026-1816,SUSE-SLE-Micro-5.5-2026-1816
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
5.9 (Medium)
Affected products
Recommended
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-1.20.1-150500.3.20.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-1.20.1-150500.3.20.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-1.20.1-150500.3.20.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-1.20.1-150500.3.20.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-1.20.1-150500.3.20.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-1.20.1-150500.3.20.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-1.20.1-150500.3.20.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-1.20.1-150500.3.20.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
5.9 (Medium)
Affected products
Recommended
8 products, the same list as for
CVE-2026-40355
Threats
Impact
moderate
References
12 references
{
"document": {
"aggregate_severity": {
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"text": "moderate"
},
"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
"text": "Copyright 2024 SUSE LLC. All rights reserved.",
"tlp": {
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{
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"title": "Title of the patch"
},
{
"category": "description",
"text": "This update for krb5 fixes the following issues\n\n- CVE-2026-40355: Denial of Service via NULL pointer dereference in NegoEx mechanism (bsc#1263366).\n- CVE-2026-40356: Denial of Service via integer underflow and out-of-bounds read (bsc#1263367).\n",
"title": "Description of the patch"
},
{
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"title": "Patchnames"
},
{
"category": "legal_disclaimer",
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"title": "Terms of use"
}
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"publisher": {
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"name": "SUSE Product Security Team",
"namespace": "https://www.suse.com/"
},
"references": [
{
"category": "external",
"summary": "SUSE ratings",
"url": "https://www.suse.com/support/security/rating/"
},
{
"category": "self",
"summary": "URL of this CSAF notice",
"url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_1816-1.json"
},
{
"category": "self",
"summary": "URL for SUSE-SU-2026:1816-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-20261816-1/"
},
{
"category": "self",
"summary": "E-Mail link for SUSE-SU-2026:1816-1",
"url": "https://lists.suse.com/pipermail/sle-updates/2026-May/046423.html"
},
{
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},
{
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},
{
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},
{
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}
],
"title": "Security update for krb5",
"tracking": {
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"generator": {
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{
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],
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},
"vulnerabilities": [
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],
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"title": "CVE description"
}
],
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],
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],
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}
]
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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