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    CVE-2026-69184

    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.

    Published:Sep 18, 2026
    Last Modified:Sep 21, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00675
    CVSS Score:7.5

    Affected Products

    Vendor
    C-ares
    Product
    C-ares

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-69186 (CVSS 5.3) — c-ares is an asynchronous resolver library. Prior to 1.34.7, ares_dns_parse() trusts the attacker-controlled A…
    CVE-2026-33630 (CVSS 7.5) — c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-…
    CVE-2025-62408 (CVSS 5.9) — c-ares is an asynchronous resolver library. Versions 1.32.3 through 1.34.5 terminate a query after maximum at…
    CVE-2024-25629 (CVSS 4.4) — c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration …
    CVE-2020-22217 (CVSS 5.9) — Buffer overflow vulnerability in c-ares before 1_16_1 thru 1_17_0 via function ares_parse_soa_reply in ares_pa…
    CVE-2023-32067 (CVSS 7.5) — c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver se…
    CVE-2020-14354 (CVSS 3.3) — A possible use-after-free and double-free in c-ares lib version 1.16.0 if ares_destroy() is called prior to ar…
    CVE-2017-1000381 (CVSS 7.5) — The c-ares function `ares_parse_naptr_reply()`, which is used for parsing NAPTR responses, could be triggered …
    CVE-2016-5180 (CVSS 9.8) — Heap-based buffer overflow in the ares_create_query function in c-ares 1.x before 1.12.0 allows remote attacke…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High