Medium
cairosvg — security advisory
CairoSVG is a Python (pypi) package. CairoSVG is an SVG converter based on Cairo. In CairoSVG before version 2.5.1, there is a regular expression denial of service (REDoS) vulnerability. When processing SVG files, the python package CairoSVG uses two regular expressions which are vulnerable to Regular Expression Denial of Service (REDoS). If an attacker provides a malicious SVG, it can make cairosvg get stuck processing the file for a very long time. This is fixed in version 2.5.1. See Referenced GitHub advisory for more information.
- Products
- cairosvg
- Affected versions
- 1.0.16-1, 1.0.17-1, 1.0.19-1, 1.0.20-1, 2.4.0-2, 2.4.2-1, 2.5.0-1.1, 2.5.2-1, 2.7.1-1, 2.7.1-2, 2.8.2-1, 2.9.0-1, 2.9.0-2
- Fixed versions
- Not specified
- CVEs
- CVE-2021-21236
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 00:57 UTC · Revision 1
Source evidence
CairoSVG is a Python (pypi) package. CairoSVG is an SVG converter based on Cairo. In CairoSVG before version 2.5.1, there is a regular expression denial of service (REDoS) vulnerability. When processing SVG files, the python package CairoSVG uses two regular expressions which are vulnerable to Regular Expression Denial of Service (REDoS). If an attacker provides a malicious SVG, it can make cairosvg get stuck processing the file for a very long time. This is fixed in version 2.5.1. See Referenced GitHub advisory for more information.
osv:UBUNTU-CVE-2021-21236
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
cairosvg
Fixed versions: Not specified
Complete source record
{
"id": "2dd019116d46326b41ad295e91ae7a791aa5662b81c6b5eb0682b102584294b0",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-21236",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2021-21236",
"summary": "CairoSVG is a Python (pypi) package. CairoSVG is an SVG converter based on Cairo. In CairoSVG before version 2.5.1, there is a regular expression denial of service (REDoS) vulnerability. When processing SVG files, the python package CairoSVG uses two regular expressions which are vulnerable to Regular Expression Denial of Service (REDoS). If an attacker provides a malicious SVG, it can make cairosvg get stuck processing the file for a very long time. This is fixed in version 2.5.1. See Referenced GitHub advisory for more information.",
"evidence": "osv:UBUNTU-CVE-2021-21236",
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{
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{
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],
"severity": "medium",
"structured": {
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"aliases": [
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],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
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"events": [
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"package": {
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"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
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],
"database_specific": {
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},
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"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
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"2.4.2-1"
],
"database_specific": {
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"purl": "pkg:deb/ubuntu/cairosvg?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"2.5.0-1.1",
"2.5.2-1"
],
"database_specific": {
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],
"modified": "2026-10-17T12:56:19.326673305Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2021-21236",
"https://github.com/Kozea/CairoSVG/security/advisories/GHSA-hq37-853p-g5cf",
"https://github.com/Kozea/CairoSVG/commit/063185b60588a41d4df661ad70f9f7b699901abc",
"https://github.com/Kozea/CairoSVG/commit/cfc9175e590531d90384aa88845052de53d94bf3",
"https://github.com/Kozea/CairoSVG/releases/tag/2.5.1",
"https://pypi.org/project/CairoSVG/",
"https://www.cve.org/CVERecord?id=CVE-2021-21236"
]
},
"related_cves": [
{
"value": "CVE-2021-21236",
"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 355246,
"published_at": "2021-01-06T17:15:00+00:00"
}