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CVE-2026-69184 c-ares is an asynchronous resolver library

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.

Produits et versions touchés

Produit Versions touchées Corrigé en
c-ares 1.34 premières → < 1.34.7 1.34.7

Références

Chronologie

  1. Publiée
  2. Dernière modification

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