CVE-2022-31151

undici before v5.8.0 vulnerable to uncleared cookies on cross-host / cross-origin redirect

Workarounds

By default, this vulnerability is not exploitable.
Do not enable redirections, i.e. maxRedirections: 0 (the default).

References

https://hackerone.com/reports/1635514
https://curl.se/docs/CVE-2018-1000007.html
https://curl.se/docs/CVE-2022-27776.html

For more information

If you have any questions or comments about this advisory:

• Open an issue in undici repository
• To make a report, follow the SECURITY document

Authorization headers are already cleared on cross-origin redirect in
https://github.com/nodejs/undici/blob/main/lib/handler/redirect.js#L189, based on https://github.com/nodejs/undici/issues/872.

However, cookie headers which are sensitive headers and are official headers found in the spec, remain uncleared. There also has been active discussion of implementing a cookie store https://github.com/nodejs/undici/pull/1441, which suggests that there are active users using cookie headers in undici.
As such this may lead to accidental leakage of cookie to a 3rd-party site or a malicious attacker who can control the redirection target (ie. an open redirector) to leak the cookie to the 3rd party site.

Untrusted input controls a URL used for redirection, which can forward users to attacker-controlled sites. Typical impact: phishing and credential harvesting via a trusted domain.

CVE-2022-31151 has a CVSS score of 3.7 (Low). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (5.8.0); upgrading removes the vulnerable code path.

Kodem intelligence

Already deployed Kodem?

This was patched in v5.8.0.

1. What is CVE-2022-31151? CVE-2022-31151 is a low-severity open redirect vulnerability in undici (npm), affecting versions < 5.8.0. It is fixed in 5.8.0. Untrusted input controls a URL used for redirection, which can forward users to attacker-controlled sites.
2. How severe is CVE-2022-31151? CVE-2022-31151 has a CVSS score of 3.7 (Low). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of undici are affected by CVE-2022-31151? undici (npm) versions < 5.8.0 is affected.
4. Is there a fix for CVE-2022-31151? Yes. CVE-2022-31151 is fixed in 5.8.0. Upgrade to this version or later.
5. Is CVE-2022-31151 exploitable, and should I be worried? Whether CVE-2022-31151 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2022-31151 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2022-31151? Upgrade undici to 5.8.0 or later.

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