SUSE-SU-2026:4906-1
Vulnerability from csaf_suse - Published: 2026-10-26 07:20 - Updated: 2026-10-26 19:21Summary
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-2026-107708: Denial of Service via malformed PAC in S4U2Proxy requests (bsc#1284816).
- CVE-2026-107778: Denial of Service via crafted forwarded credentials (bsc#1284817).
Patchnames: SUSE-2026-4906,SUSE-SLE-Micro-5.5-2026-4906
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
4.9 (Medium)
Affected products
Recommended
8 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-0:1.20.1-150500.3.26.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-0:1.20.1-150500.3.26.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-0:1.20.1-150500.3.26.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-0:1.20.1-150500.3.26.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-0:1.20.1-150500.3.26.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-0:1.20.1-150500.3.26.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-0:1.20.1-150500.3.26.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Micro 5.5:krb5-client-0:1.20.1-150500.3.26.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
6.5 (Medium)
Affected products
Recommended
8 products, the same list as for
CVE-2026-107708
Threats
Impact
moderate
References
12 references
{
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"distribution": {
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"text": "This update for krb5 fixes the following issues:\n\n- CVE-2026-107708: Denial of Service via malformed PAC in S4U2Proxy requests (bsc#1284816).\n- CVE-2026-107778: Denial of Service via crafted forwarded credentials (bsc#1284817).\n",
"title": "Description of the patch"
},
{
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"title": "Patchnames"
},
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"title": "Terms of use"
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"category": "external",
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"url": "https://www.suse.com/support/security/rating/"
},
{
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},
{
"category": "self",
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},
{
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},
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}
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],
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},
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}
],
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"category": "general",
"text": "MIT krb5 through 1.22.2 contains a NULL pointer dereference vulnerability in the KDC\u0027s get_pac_princ_with_realm() that returns success while leaving the client principal NULL on malformed names. A malicious or compromised cross-realm trusted KDC can send an S4U2Proxy request with a PAC carrying a malformed client name to crash krb5kdc and deny authentication.",
"title": "CVE description"
}
],
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]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.