CVE-2021-32763

Regular Expression Denial of Service in OpenProject forum messages

Description

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 2<sup>n</sup> 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.

Category

4.3
CVSS
Severity: Medium
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.31%
Third-Party Advisory github.com Third-Party Advisory github.com
Affected: opf openproject
Published at:
Updated at:

References

Link Tags
https://github.com/opf/openproject/security/advisories/GHSA-qqvp-j6gm-q56f third party advisory patch
https://github.com/opf/openproject/pull/9447.patch third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-32763?
CVE-2021-32763 has been scored as a medium severity vulnerability.
How to fix CVE-2021-32763?
To fix CVE-2021-32763, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-32763 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-32763 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-32763?
CVE-2021-32763 affects opf openproject.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.