What’s Vulnerable › Vulnerabilities

CVE-2021-23341: Regular Expression Denial of Service (ReDoS)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-18 · updated 2026-06-17

Description

The package prismjs before 1.23.0 are vulnerable to Regular Expression Denial of Service (ReDoS) via the prism-asciidoc, prism-rest, prism-tap and prism-eiffel components.

Affected products

• PrismJS prism: before 1.23.0 — fixed in 1.23.0

How to fix

Upgrade to a fixed version: PrismJS prism 1.23.0. Check the vendor advisory for mitigations.

References

• https://github.com/PrismJS/prism/commit/c2f6a64426f44497a675cb32dccb079b3eff1609
• https://github.com/PrismJS/prism/issues/2583
• https://github.com/PrismJS/prism/pull/2584
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1076583
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1076582
• https://snyk.io/vuln/SNYK-JS-PRISMJS-1076581
• https://github.com/PrismJS/prism/commit/c2f6a64426f44497a675cb32dccb079b3eff1609
• https://github.com/PrismJS/prism/issues/2583
• https://github.com/PrismJS/prism/pull/2584
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARS-1076583
• https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1076582
• https://snyk.io/vuln/SNYK-JS-PRISMJS-1076581

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