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<a href="https://gitlab.com/gpantela">George Pantelakis</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1594">#1594</a>
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<a href="#description-of-problem" aria-hidden="true" class="anchor" id="user-content-description-of-problem" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Description of problem:</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">When we have a very big compressed certificate message then we get a decode_error from the server but the message has the correct format. The message should pass the decoding error and pass. For example, if we have the message "0x19 + 0x4c4b48 + 0x0001 + 0x000fff + 0x4c4b40 + (5000000 * 0x00)", which is a valid message according to RFC, it should be decoded correctly and then sent back a bad_certificate alert since the compressed message cannot be decompressed.</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #28272d; margin: 24px 0 16px;" align="initial">
<a href="#version-of-gnutls-used" aria-hidden="true" class="anchor" id="user-content-version-of-gnutls-used" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Version of gnutls used:</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">gnutls-3.8.7</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #28272d; margin: 24px 0 16px;" align="initial">
<a href="#distributor-of-gnutls-eg-ubuntu-fedora-rhel" aria-hidden="true" class="anchor" id="user-content-distributor-of-gnutls-eg-ubuntu-fedora-rhel" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">RHEL and Fedora</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #28272d; margin: 24px 0 16px;" align="initial">
<a href="#how-reproducible" aria-hidden="true" class="anchor" id="user-content-how-reproducible" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>How reproducible:</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Always</p>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Steps to Reproduce:</p>
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<li style="margin-top: 0; line-height: 1.6em; margin-left: 25px; padding-left: 3px;">Run <a href="https://github.com/tlsfuzzer/tlsfuzzer/blob/master/scripts/test-tls13-client-certificate-compression.py" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">https://github.com/tlsfuzzer/tlsfuzzer/blob/master/scripts/test-tls13-client-certificate-compression.py</a> with "--random-fuzz-size 5" against a GnuTLS server.</li>
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<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #28272d; margin: 24px 0 16px;" align="initial">
<a href="#actual-results" aria-hidden="true" class="anchor" id="user-content-actual-results" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Actual results:</h2>
<p dir="auto" style="color: #28272d; margin: 0 0 16px;" align="initial">Tests "fuzzing of * bytes" from test-tls13-client-certificate-compression.py fail</p>
<h2 dir="auto" style="font-size: 1.5em; font-weight: 600; padding-bottom: .3em; border-bottom-width: 1px; border-bottom-color: #bfbfc3; border-bottom-style: solid; color: #28272d; margin: 24px 0 16px;" align="initial">
<a href="#expected-results" aria-hidden="true" class="anchor" id="user-content-expected-results" style="margin-top: 0; float: left; margin-left: -20px; text-decoration: none; outline: none;"></a>Expected results:</h2>
<p dir="auto" style="color: #28272d; margin: 0;" align="initial">Tests "fuzzing of * bytes" from test-tls13-client-certificate-compression.py should pass</p>
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