Vulnerability-Lookup

CVE-2026-69186 (GCVE-0-2026-69186)

Vulnerability from cvelistv5 – Published: 2026-09-18 17:25 – Updated: 2026-09-18 19:51

Title

c-ares: Memory-amplification denial of service via unvalidated DNS header record counts

Summary

c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() invokes parsing before transaction ID and question validation, a malicious DNS response can cause ares_dns_record_rr_prealloc() and ares_array_set_size() to reserve disproportionate heap memory for a tiny message. Repeated responses create large allocation and release cycles that can degrade or deny name resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 19:50 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7955 records in the last 180 days details

References

5 references

URL	Tags
https://github.com/c-ares/c-ares/security/advisor…	x_refsource_CONFIRM
https://github.com/c-ares/c-ares/pull/1134	x_refsource_MISC
https://github.com/c-ares/c-ares/commit/e47c203f9…	x_refsource_MISC
https://github.com/c-ares/c-ares/commit/eaded4cb2…	x_refsource_MISC
https://github.com/c-ares/c-ares/releases/tag/v1.34.7	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
c-ares	c-ares	Affected: < 1.34.7	guessed

Show details on NVD website

JSON

To clipboard

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}

BELL-CVE-2026-69186 (CVE-2026-69186)

Vulnerability from osv_bellsoft – Published: 2026-08-15 06:06 – Updated: 2026-08-20 06:01 – Source website

Severity

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

URL

Type

https://docs.bell-sw.com/security/cves/CVE-2026-69186

ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Alpaquita:25",
        "name": "c-ares",
        "purl": "pkg:apk/alpaquita/c-ares?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.34.5-r0"
            },
            {
              "fixed": "1.34.8-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Alpaquita:stream",
        "name": "c-ares",
        "purl": "pkg:apk/alpaquita/c-ares?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.20.1-r0"
            },
            {
              "fixed": "1.34.8-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "BellSoft Hardened Containers:25",
        "name": "c-ares",
        "purl": "pkg:apk/bellsoft-hardened-containers/c-ares?arch=source\u0026distro=25"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.34.5-r0"
            },
            {
              "fixed": "1.34.8-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "BellSoft Hardened Containers:stream",
        "name": "c-ares",
        "purl": "pkg:apk/bellsoft-hardened-containers/c-ares?arch=source\u0026distro=stream"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.20.1-r0"
            },
            {
              "fixed": "1.34.8-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "id": "BELL-CVE-2026-69186",
  "modified": "2026-08-20T06:01:33.398348Z",
  "published": "2026-08-15T06:06:33.170313Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://docs.bell-sw.com/security/cves/CVE-2026-69186"
    }
  ],
  "schema_version": "1.7.4",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-69186"
  ]
}

FKIE_CVE-2026-69186

Vulnerability from fkie_nvd - Published: 2026-09-18 18:17 - Updated: 2026-09-23 18:12

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/c-ares/c-ares/commit/e47c203f91cd8b749c8736bc18d75a31ffdec8f4
	security-advisories@github.com	https://github.com/c-ares/c-ares/commit/eaded4cb200b2a5f8d73f11021ff7c8d6968aaab
	security-advisories@github.com	https://github.com/c-ares/c-ares/pull/1134
	security-advisories@github.com	https://github.com/c-ares/c-ares/releases/tag/v1.34.7
	security-advisories@github.com	https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "c-ares",
          "vendor": "c-ares",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.34.7"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled ANCOUNT, NSCOUNT, and ARCOUNT fields before confirming that the DNS response contains enough bytes for the claimed records. Because process_answer() invokes parsing before transaction ID and question validation, a malicious DNS response can cause ares_dns_record_rr_prealloc() and ares_array_set_size() to reserve disproportionate heap memory for a tiny message. Repeated responses create large allocation and release cycles that can degrade or deny name resolution, without causing memory corruption or information disclosure. This issue is fixed in version 1.34.7."
    }
  ],
  "id": "CVE-2026-69186",
  "lastModified": "2026-09-23T18:12:04.247",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-69186",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-18T19:50:58.245833Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-18T18:17:11.637",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/c-ares/c-ares/commit/e47c203f91cd8b749c8736bc18d75a31ffdec8f4"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/c-ares/c-ares/commit/eaded4cb200b2a5f8d73f11021ff7c8d6968aaab"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/c-ares/c-ares/pull/1134"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/c-ares/c-ares/releases/tag/v1.34.7"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-400"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

MSRC_CVE-2026-69186

Vulnerability from csaf_microsoft - Published: 2026-09-20 01:01 - Updated: 2026-11-01 14:51

Summary

c-ares: Memory-amplification denial of service via unvalidated DNS header record counts

Scope

1 vulnerability in this advisory, including CVE-2026-69186.

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

Fixed: 1 product Known affected: 3 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

OPENSUSE-SU-2026:11593-1

Vulnerability from csaf_opensuse - Published: 2026-08-25 00:00 - Updated: 2026-09-19 08:20

Summary

c-ares-devel-1.34.8-1.1 on GA media

Severity

Moderate

Scope

3 vulnerabilities in this advisory, including CVE-2026-69186.

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

Recommended: 16 products

Open the full advisory

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

Scope

3 vulnerabilities in this advisory, including CVE-2026-69186.

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

Recommended: 12 products

Open the full advisory

RHSA-2026:40574

Vulnerability from csaf_redhat - Published: 2026-07-16 01:07 - Updated: 2026-10-30 07:44

Summary

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Severity

Important

Scope

2 vulnerabilities in this advisory, including CVE-2026-69186.

CVE-2026-69186

A flaw was found in c-ares, an asynchronous resolver library. A remote attacker can send a specially crafted DNS response that causes the `ares_dns_parse()` function to trust attacker-controlled record counts without validating if the response contains enough bytes for the claimed records. This can lead to disproportionate heap memory reservation, resulting in a memory-amplification denial of service (DoS) by degrading or denying name resolution.

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Fixed: 5 products

https://access.redhat.com/errata/RHSA-2026:40574

Open the full advisory

SUSE-SU-2026:23364-1

Vulnerability from csaf_suse - Published: 2026-08-28 11:28 - Updated: 2026-09-20 18:41

Summary

Security update for c-ares

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-69186.

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

Recommended: 3 products

Open the full advisory

SUSE-SU-2026:23414-1

Vulnerability from csaf_suse - Published: 2026-08-31 19:41 - Updated: 2026-09-19 08:18

Summary

Security update for c-ares

Severity

Important

Scope

5 vulnerabilities in this advisory, including CVE-2026-69186.

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

Recommended: 4 products

Open the full advisory

SUSE-SU-2026:23597-1

Vulnerability from csaf_suse - Published: 2026-09-01 15:51 - Updated: 2026-09-29 17:28

Summary

Security update for c-ares

Severity

Important

Scope

3 vulnerabilities in this advisory, including CVE-2026-69186.

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

Recommended: 24 products

Open the full advisory

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

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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.

Action not permitted

CVE-2026-69186 (GCVE-0-2026-69186)

BELL-CVE-2026-69186 (CVE-2026-69186)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour