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    <language>en-us</language>    <build-info>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-44154] Consider making FCV checks for $-prefixed field names</title>
                <link>https://jira.mongodb.org/browse/SERVER-44154</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In 4.2, $-prefixed field names were banned everywhere in agg.&lt;/p&gt;

&lt;p&gt;In 4.4, there is a small &lt;a href=&quot;https://github.com/mongodb/mongo/blob/604cc100d1e12422aa3243385bc994651e0e19d2/src/mongo/db/pipeline/field_path.cpp#L42-L57&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;whitelist&lt;/a&gt;&#160;of field names permitted to start with $.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;If a user were to create a view, or a validator (and use $expr) with a $-prefixed field name in FCV 4.2, they may not be able to downgrade without dropping views/collections with a 4.4. binary.&lt;/p&gt;</description>
                <environment></environment>
        <key id="976644">SERVER-44154</key>
            <summary>Consider making FCV checks for $-prefixed field names</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="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="backlog-server-query">Backlog - Query Team</assignee>
                                    <reporter username="ian.boros@mongodb.com">Ian Boros</reporter>
                        <labels>
                    </labels>
                <created>Tue, 22 Oct 2019 20:45:08 +0000</created>
                <updated>Tue, 6 Dec 2022 02:44:01 +0000</updated>
                            <resolved>Tue, 5 Nov 2019 16:33:10 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="2513436" author="ian.boros" created="Thu, 31 Oct 2019 21:51:15 +0000"  >&lt;p&gt;I&apos;m tempted to close this as &quot;won&apos;t fix.&quot; This would be a relatively large amount of work for what I suspect is an unlikely case that only an &quot;adversarial&quot; user would find. Even if such a case happened, they could downgrade by using a 4.4 binary to drop the relevant view/collection. I&apos;m not sure what our policy is on this kind of thing, however, so I&apos;m flagging this for triage.&lt;/p&gt;</comment>
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