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    <title>MongoDB Jira</title>
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    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-65551] Investigate PCRE2 resource usage limits</title>
                <link>https://jira.mongodb.org/browse/SERVER-65551</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;PCRE2 has API functions that allow users to change resource limits at runtime. It might be worthwhile to set these limits lower by default, and create server parameters to allow users to raise them. SECURITY-757 describes potential security risks with leaving these limits high on Atlas Free Tier or Serverless. We should determine default limits that will fill the needs of most users, while limiting the library&apos;s resource usage as much as possible.&lt;/p&gt;

&lt;p&gt;The limits below, &lt;a href=&quot;https://www.pcre.org/current/doc/html/pcre2build.html#SEC11&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;described here&lt;/a&gt;, can be set while configuring the library. They are also possible to change at runtime with &lt;a href=&quot;https://www.pcre.org/current/doc/html/pcre2api.html#SEC4&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;these functions&lt;/a&gt;.&lt;br/&gt;
--with-match-limit&lt;br/&gt;
--with-heap-limit&lt;br/&gt;
--with-match-limit_depth&lt;/p&gt;

&lt;p&gt;&lt;a href=&quot;https://github.com/10gen/mongo/blob/master/jstests/aggregation/expressions/regex_limits.js&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;regex_limits.js&lt;/a&gt; tests many of these limits. This &lt;a href=&quot;https://github.com/10gen/mongo/blob/d8934508d139a3ed7d1fbd8d96971019166f2944/jstests/aggregation/expressions/regex_limits.js#L73-L86&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;capture group limit test case&lt;/a&gt; is failing in PCRE2, because the memory usage differs slightly from PCRE. This is what led me to question whether the capture group limit should even be so high that it can hit the MongoDB internal memory limit (or stay just under the limit but run for a really long time and take up a lot of resources.)&lt;/p&gt;</description>
                <environment></environment>
        <key id="2024299">SERVER-65551</key>
            <summary>Investigate PCRE2 resource usage limits</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="christopher.harris@mongodb.com">Chris Harris</assignee>
                                    <reporter username="jennifer.peshansky@mongodb.com">Jennifer Peshansky</reporter>
                        <labels>
                    </labels>
                <created>Wed, 13 Apr 2022 15:21:26 +0000</created>
                <updated>Thu, 30 Jun 2022 18:45:15 +0000</updated>
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