Regular Expression Denial of Service (ReDoS) in Prism
Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS).
Impact
When Prism is used to highlight untrusted (user-given) text, an attacker can craft a string that will take a very very long time to highlight. Do not use the following languages to highlight untrusted text.
- ASCIIDoc
- ERB
Other languages are not affected and can be used to highlight untrusted text.
Patches
This problem has been fixed in Prism v1.24.
References
- PrismJS/prism#2774
- PrismJS/prism#2688
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | prismjs | < 1.24.0 | 1.24.0 |
References
- https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hg
- https://nvd.nist.gov/vuln/detail/CVE-2021-32723
- https://github.com/PrismJS/prism/pull/2688
- https://github.com/PrismJS/prism/pull/2774
- https://github.com/PrismJS/prism/commit/d85e30da6755fdbe7f8559f8e75d122297167018
- https://github.com/PrismJS/prism
- https://www.oracle.com/security-alerts/cpujan2022.html
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:N/A:H- Weakness (CWE)
CWE-400- Platform
- npm
- Package
prismjs- Disclosed
- 28.06.2021
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-gj77-59wh-66hg - CC BY 4.0
Vulnerability history: prismjs
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 6
- First → latest
- 08.2020 03.2025
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- High 4
- Medium 2
Disclosures per year
- 2020: 1
- 2021: 3
- 2022: 1
- 2023: 0
- 2024: 0
- 2025: 1
- 2026: 0
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Regular Expression Denial of Service (ReDoS) in Prism this entry
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