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Vulnerability record · CVE-2021-32723 · published 28 June 2021

CVE-2021-32723: Prismjs prism uncontrolled resource consumption vulnerability

PPrismjs · Prism

Prism is a syntax highlighting library. Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS). 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. This problem has been fixed in Prism v1.24. As a workaround, do not use ASCIIDoc or ERB to highlight untrusted text. Other languages are not affected and can be used to highlight untrusted text.

6.5 CVSS 3.1 Medium EPSS 1.4% · top 28.1% CWE-400 · Uncontrolled resource consumption
6.5CVSS 3.1 base score, v2 4.3
1.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

Description

Prism is a syntax highlighting library. Some languages before 1.24.0 are vulnerable to Regular Expression Denial of Service (ReDoS). 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. This problem has been fixed in Prism v1.24. As a workaround, do not use ASCIIDoc or ERB to highlight untrusted text. Other languages are not affected and can be used to highlight untrusted text.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/PrismJS/prism/pull/2688 PatchThird Party Advisory
https://github.com/PrismJS/prism/pull/2774 PatchThird Party Advisory
https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hg Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory
https://github.com/PrismJS/prism/pull/2688 PatchThird Party Advisory
https://github.com/PrismJS/prism/pull/2774 PatchThird Party Advisory
https://github.com/PrismJS/prism/security/advisories/GHSA-gj77-59wh-66hg Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2021-32723), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.