CVE-2018-7651: Regular Expression Denial of Service in ssri
Summary
CVE-2018-7651: Regular Expression Denial of Service in ssri. Affects ssri versions < 5.2.2. Fixed in 5.2.2. How to fix ↓
Also tracked for
- node-ssri · Debian:11
The same CVE-2018-7651 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.
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Background
The package under scrutiny is ssri, an npm package. It is used for computing subresource integrity hashes. Subresource integrity (SRI) is a security feature that allows browsers to verify that files they fetch (such as scripts and stylesheets) have not been tampered with. The ssri package provides functions for generating and verifying SRI hashes. However, versions prior to 5.2.2 are vulnerable to regular expression denial of service (ReDoS) when using strict mode.
Vulnerability Detail
The vulnerability in ssri arises from the use of regular expressions in strict mode. An attacker can exploit this vulnerability by providing a specially crafted input that triggers a ReDoS attack. This can lead to a denial of service condition, where the application becomes unresponsive or crashes. The severity of this vulnerability is rated as MODERATE with a CVSS score of 5.9.
How To Fix
Latest published version: 14.0.0 as of 22 Oct 2026
npm install ssri@14.0.0Upgrading to it may include breaking changes; the version below is the minimum fixed release for this vulnerability.
If you need the minimum change
5.2.2
This is the first release that contains the fix.
npm install ssri@5.2.2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Conclusion
In conclusion, the ssri package prior to version 5.2.2 is vulnerable to regular expression denial of service (ReDoS) when using strict mode. This can lead to a denial of service condition. It is recommended to update to the latest version of the package to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for ssri →
FAQ
ssri is an npm package used for computing subresource integrity hashes.
Subresource integrity (SRI) is a security feature that allows browsers to verify the integrity of files they fetch.
Regular expression denial of service (ReDoS) is a type of attack that exploits the exponential time complexity of certain regular expressions, causing the application to become unresponsive or crash.
This vulnerability can lead to a denial of service condition, where the application becomes unresponsive or crashes.
To fix this vulnerability, update to version 5.2.2 or later of the ssri package.
References
Related vulnerabilities
Recent vulnerabilities recorded for ssri.
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