OPENSUSE-SU-2026:21721-1
Vulnerability from csaf_opensuse - Published: 2026-09-01 15:48 - Updated: 2026-09-17 17:43Summary
Security update for c-ares
Severity
Important
Notes
Title of the patch: Security update for c-ares
Description of the patch: This update for c-ares fixes the following issues:
Updat to c-ares 1.36.8.
- CVE-2026-33630: remotely triggerable use-after-free/double-free in query-completion handling via `ares_getaddrinfo()`
over TCP (bsc#1270416).
- CVE-2026-69184: CPU exhaustion denial of service via unbounded DNS name compression pointer chains (bsc#1276290).
- CVE-2026-69186: memory amplification denial of service via unvalidated DNS header record counts (bsc#1276291).
Changes for c-ares:
- For details, see https://c-ares.org/changelog.html.
Patchnames: openSUSE-Leap-16.0-1579
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
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: openSUSE Leap 16.0:c-ares-devel-0:1.34.8-160000.1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-devel-0:1.34.8-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-devel-0:1.34.8-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-devel-0:1.34.8-160000.1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-utils-0:1.34.8-160000.1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-utils-0:1.34.8-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-utils-0:1.34.8-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:c-ares-utils-0:1.34.8-160000.1.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libcares2-0:1.34.8-160000.1.1.aarch64 | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libcares2-0:1.34.8-160000.1.1.ppc64le | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libcares2-0:1.34.8-160000.1.1.s390x | — |
Vendor Fix
|
|
| Unresolved product id: openSUSE Leap 16.0:libcares2-0:1.34.8-160000.1.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
important
7.5 (High)
Affected products
Recommended
12 products, the same list as for
CVE-2026-33630
Threats
Impact
important
5.3 (Medium)
Affected products
Recommended
12 products, the same list as for
CVE-2026-33630
Threats
Impact
moderate
References
14 references
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}
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"notes": [
{
"category": "general",
"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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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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