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Vulnerability Detail

CVE-2026-69184 Verified Sceawere Triage Sources: NVD / CISA KEV

Vulnerability Metadata

Severity
High
Score / CVSS
7.5
Creation Date
2h ago
Vendor
c-ares
Product
c-ares
Attack Type
CWE-407: Inefficient Algorithmic Complexity
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Complexity
LOW

Narrative and Response

Description

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.

Executive Summary

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Technical Details

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Mitigations

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References

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Additional Metadata

{
  "score": "7.5",
  "pubDate": "2026-09-18T18:17:11.477Z",
  "pubdate": "2026-09-18T18:17:11.477Z"
}
CVE-2026-69184: CVE-2026-69184 Vulnerability (HIGH Severity, CVSS: 7.5) | Sceawere