method-override ReDoS when untrusted user input passed into X-HTTP-Method-Override header

HIGH 7.5CVE-2017-16136 · GHSA-qx2f-477c-35rq · Published 07/06/2018 · updated 17/06/2026

In short

CVE-2017-16136 is a HIGH (CVSS 7.5) vulnerability affecting method-override (expressjs), method-override.
Chance of exploitation in the next 30 days (EPSS): 1.2%, higher than 68.1% of all vulnerabilities.
Fix: update to 2.3.10 or later.

Package	Affected versions	Patched versions
method-override expressjs	`< 2.3.10`	`2.3.10`
method-override npm	`≥ 1.0.2, < 2.3.10≥ 2.0.0, < 2.3.10`	`2.3.10`

Description

Affected versions of method-override are vulnerable to a regular expression denial of service vulnerability when untrusted user input is passed into the X-HTTP-Method-Override header.

Recommendation

Update to version 2.3.10 or later

NVD description

method-override is a module used by the Express.js framework to let you use HTTP verbs such as PUT or DELETE in places where the client doesn't support it. method-override is vulnerable to a regular expression denial of service vulnerability when specially crafted input is passed in to be parsed via the X-HTTP-Method-Override header.

References

nvd.nist.gov/vuln/detail/CVE-2017-16136 · ADVISORY
expressjs/method-override commit 4c58835 · WEB
expressjs/method-override · PACKAGE
npmjs.com/advisories/538 · WEB
nodesecurity.io/advisories/538 · Third Party Advisory

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