GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

OPENSUSE-SU-2026:21721-1

Vulnerability from csaf_opensuse - Published: 2026-09-01 15:48 - Updated: 2026-09-19 08:20
Summary
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).
CVE-2026-33630
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected 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
CVE-2026-69184
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
Recommended 12 products, the same list as for CVE-2026-33630
Threats
Impact important
CVE-2026-69186
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Affected products
Recommended 12 products, the same list as for CVE-2026-33630
Threats
Impact moderate
References
To clipboard 

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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.


Detection rules are retrieved from Rulezet.


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.