What’s Vulnerable › Vulnerabilities

CVE-2022-31781: Regular Expression Denial of Service (ReDoS) in ContentType.java. (GHSL-2022-022)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-07-13 · updated 2026-06-17
• Weakness: CWE-1333

Description

Apache Tapestry up to version 5.8.1 is vulnerable to Regular Expression Denial of Service (ReDoS) in the way it handles Content Types. Specially crafted Content Types may cause catastrophic backtracking, taking exponential time to complete. Specifically, this is about the regular expression used on the parameter of the org.apache.tapestry5.http.ContentType class. Apache Tapestry 5.8.2 has a fix for this vulnerability. Notice the vulnerability cannot be triggered by web requests in Tapestry code alone. It would only happen if there's some non-Tapestry codepath passing some outside input to the ContentType class constructor.

Affected products

• Apache Software Foundation Apache Tapestry: before 5.8.2 — fixed in 5.8.2

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache Tapestry 5.8.2. Check the vendor advisory for mitigations.

References

• https://www.openwall.com/lists/oss-security/2022/07/12/3
• https://www.openwall.com/lists/oss-security/2022/07/12/3

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