CVE-2026-35406: netavark has incorrect error handling for malformed tcp packets

April 7, 2026 (updated April 24, 2026)

A truncated TCP DNS query followed by a connection reset causes aardvark-dns to enter an unrecoverable infinite error loop at 100% CPU.

References

github.com/advisories/GHSA-hfpq-x728-986j
github.com/containers/aardvark-dns/commit/3b49ea7b38bdea134b7f03256f2e13f44ce73bb1
github.com/containers/aardvark-dns/releases/tag/v1.17.1
github.com/containers/aardvark-dns/security/advisories/GHSA-hfpq-x728-986j
nvd.nist.gov/vuln/detail/CVE-2026-35406

Code Behaviors & Features

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