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<a id="user-content-description-of-problem" class="anchor" href="#description-of-problem" aria-hidden="true"></a>Description of problem:</h2>
<p dir="auto">When ClientHello compression methods does not include CompressionMethod.null, GnuTLS aborts the connection with handshake_failure alert instead of illegal_parameter</p>
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<a id="user-content-version-of-gnutls-used" class="anchor" href="#version-of-gnutls-used" aria-hidden="true"></a>Version of gnutls used:</h2>
<p dir="auto"><a href="https://gitlab.com/gnutls/gnutls/commit/435437ad94723612deb1e238379d457b2456d83f" data-original="435437ad94723612deb1e238379d457b2456d83f" data-link="false" data-link-reference="false" data-project="179611" data-commit="435437ad94723612deb1e238379d457b2456d83f" data-reference-type="commit" data-container="body" data-placement="bottom" title="Merge branch 'tmp-comment-style' into 'master'" class="gfm gfm-commit has-tooltip">435437ad</a></p>
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<a id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" class="anchor" href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto">local compile on Fedora 28</p>
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<a id="user-content-how-reproducible" class="anchor" href="#how-reproducible" aria-hidden="true"></a>How reproducible:</h2>
<p dir="auto">tlsfuzzer <code>test-invalid-compression-methods.py</code> from <a href="https://github.com/tomato42/tlsfuzzer/pull/489" rel="nofollow noreferrer noopener" target="_blank">https://github.com/tomato42/tlsfuzzer/pull/489</a></p>
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<a id="user-content-actual-results" class="anchor" href="#actual-results" aria-hidden="true"></a>Actual results:</h2>
<p dir="auto">handshake_failure alert</p>
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<a id="user-content-expected-results" class="anchor" href="#expected-results" aria-hidden="true"></a>Expected results:</h2>
<p dir="auto">illegal_parameter alert for ClientHello messages that do not include null compression</p>
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