CVE-2021-32763

OpenProject is open-source, web-based project management software. In versions prior to 11.3.3, the `MessagesController` class of OpenProject has a `quote` method that implements the logic behind the Quote button in the discussion forums, and it uses a regex to strip `<pre>` tags from the message being quoted. The `(.|\s)` part can match a space character in two ways, so an unterminated `<pre>` tag containing `n` spaces causes Ruby's regex engine to backtrack to try 2ⁿ states in the NFA. This will result in a Regular Expression Denial of Service. The issue is fixed in OpenProject 11.3.3. As a workaround, one may install the patch manually.

• CWE-400

• https://github.com/opf/openproject/pull/9447.patchPatch, Third Party Advisory
• https://github.com/opf/openproject/security/advisories/GHSA-qqvp-j6gm-q56fPatch, Third Party Advisory
• https://github.com/opf/openproject/pull/9447.patchPatch, Third Party Advisory
• https://github.com/opf/openproject/security/advisories/GHSA-qqvp-j6gm-q56fPatch, Third Party Advisory

Published

Jul 20, 2021

Last Modified

Jun 17, 2026

Status

Modified

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