Security advisory
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 `` tags from the message being quoted. The `(.|\s)` part can match a space character in two ways, so an unterminated `` 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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-32763
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 11:46 UTC · Revision 1
Source evidence
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 `` tags from the message being quoted. The `(.|\s)` part can match a space character in two ways, so an unterminated `` 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.
osv:CVE-2021-32763
Complete source record
{
"id": "e5ee7433b9bef4dad16253bb2cec651716ac0a3499e7048eea0b0ee5f6325bfd",
"url": "https://osv.dev/vulnerability/CVE-2021-32763",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-32763",
"summary": "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 `` tags from the message being quoted. The `(.|\\s)` part can match a space character in two ways, so an unterminated `` 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.",
"evidence": "osv:CVE-2021-32763",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2021-32763",
"aliases": [
"CVE-2021-32763",
"GHSA-qqvp-j6gm-q56f"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/opf/openproject",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "4d9a133330792a06b58f080a21a5ef0575852cf5"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openproject:openproject:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "11.3.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v11.3.2",
"v11.3.1",
"v11.3.0",
"v11.2.4",
"v11.2.3",
"v11.2.2",
"v11.2.1",
"v11.2.0",
"v11.1.4",
"v11.1.3",
"v11.1.2",
"v11.1.1",
"v11.1.0",
"v11.0.4",
"v11.0.3",
"v11.0.2",
"v11.0.1",
"v11.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32763.json"
}
}
],
"modified": "2026-10-20T10:54:42.784937288Z",
"provider": "osv",
"references": [
"https://github.com/opf/openproject/pull/9447.patch",
"https://github.com/opf/openproject/security/advisories/GHSA-qqvp-j6gm-q56f"
],
"provider_metadata": {}
},
"related_cves": [
{
"value": "CVE-2021-32763",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 385961,
"published_at": "2021-07-20T17:15:07.813+00:00"
}