SUSE-SU-2026:3872-1
Vulnerability from csaf_suse - Published: 2026-08-28 17:57 - Updated: 2026-09-19 08:18Summary
Security update for libcares2
Severity
Important
Notes
Title of the patch: Security update for libcares2
Description of the patch: This update for libcares2 fixes the following issues:
- CVE-2026-33630: Use-after-free / double-free in c-ares query-completion handling, remotely triggerable via
ares_getaddrinfo() over TCP (bsc#1270416).
- CVE-2026-69184: CPU-exhaustion denial of service via unbounded DNS name compression pointer chains (bsc#1276290).
Patchnames: SUSE-2026-3872,SUSE-SLE-SERVER-12-SP5-LTSS-2026-3872,SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-3872
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
7.5 (High)
Affected products
Recommended
34 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares-devel-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares-devel-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares-devel-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares-devel-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares2-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares2-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares2-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise High Performance Computing 12 SP5:libcares2-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares-devel-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares-devel-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares-devel-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares-devel-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares2-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares2-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares2-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5-LTSS:libcares2-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares-devel-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares-devel-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares-devel-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares-devel-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares2-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares2-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares2-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server 12 SP5:libcares2-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libcares-devel-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libcares2-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares-devel-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares-devel-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares-devel-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares-devel-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares2-0:1.9.1-9.24.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares2-0:1.9.1-9.24.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares2-0:1.9.1-9.24.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server for SAP Applications 12 SP5:libcares2-0:1.9.1-9.24.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
7.5 (High)
Affected products
Recommended
34 products, the same list as for
CVE-2026-33630
Threats
Impact
important
References
12 references
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"product_tree": {
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{
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"relationships": [
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"text": "c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares\u0027 query-completion handling. The same flaw - a query\u0027s callback being invoked while the query is still linked in the channel\u0027s internal lookup structures - is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 1.34.7.",
"title": "CVE description"
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"scores": [
{
"cvss_v3": {
"baseScore": 7.5,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"date": "2026-08-28T17:57:11Z",
"details": "important"
}
],
"title": "CVE-2026-33630"
},
{
"cve": "CVE-2026-69184",
"ids": [
{
"system_name": "SUSE CVE Page",
"text": "https://www.suse.com/security/cve/CVE-2026-69184"
}
],
"notes": [
{
"category": "general",
"text": "c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_name_parse() enforces backward DNS compression pointers but does not bound the total pointer hops or assembled name length. A malicious DNS server can send a response containing a long descending pointer chain and many resource records whose NAME or RDATA fields refer to the chain, causing repeated decompression work that grows quadratically with message size. A single crafted response can stall the single-threaded c-ares event loop and deny DNS resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.",
"title": "CVE description"
}
],
"product_status": {
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},
"references": [
{
"category": "external",
"summary": "CVE-2026-69184",
"url": "https://www.suse.com/security/cve/CVE-2026-69184"
},
{
"category": "external",
"summary": "SUSE Bug 1276290 for CVE-2026-69184",
"url": "https://bugzilla.suse.com/1276290"
}
],
"remediations": [
{
"category": "vendor_fix",
"details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
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{
"cvss_v3": {
"baseScore": 7.5,
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"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"date": "2026-08-28T17:57:11Z",
"details": "important"
}
],
"title": "CVE-2026-69184"
}
]
}
Loading…
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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.