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7.5 High

CVE-2026-33630 c-ares is an asynchronous resolver library

Description

c-ares is an asynchronous resolver library. From ver 1.32.3 until 1.34.7, a use-after-free / double-free in c-ares' query-completion handling. The same flaw — a query's callback being invoked while the query is still linked in the channel's internal lookup structures — is present at multiple points in the resend/finish path (timeout handling, response handling, and query dispatch). If the query, or for ares_getaddrinfo() the owning host_query, is freed as a side effect of that callback, it is then accessed and/or freed a second time. This vulnerability is fixed in ver 1.34.7.

Affected products and versions

Product Affected versions Fixed in
c-ares 1.32 1.32.3 → < 1.34.7 1.34.7

References

Timeline

  1. Published
  2. Last modified

Other CVEs of c-ares

The 10 CVEs of c-ares →
CVE-2026-69184 c-ares is an asynchronous resolver library 7.5 High CVE-2026-69186 c-ares is an asynchronous resolver library 5.3 Medium CVE-2025-62408 c-ares is an asynchronous resolver library 5.9 Medium CVE-2025-31498 c-ares is an asynchronous resolver library 8.3 High
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