Credential disclosure via cross-origin redirect header reuse
Published Aug 25, 2026 · Updated Aug 25, 2026
Information disclosure in node-modules urllib before 2.44.1 and 3.0.0 through 4.9.0 allows remote attackers to obtain credentials. HttpClient.#requestInternal reuses the original options object across origins, forwarding credential headers and auth values to the redirect target. Exploitation requires an authenticated request with automatic redirects and an attacker-controlled cross-origin destination; no user interaction is required.
Summary
What happened
Information disclosure in node-modules urllib before 2.44.1 and 3.0.0 through 4.9.0 allows remote attackers to obtain credentials. HttpClient.#requestInternal reuses the original options object across origins, forwarding credential headers and auth values to the redirect target. Exploitation requires an authenticated request with automatic redirects and an attacker-controlled cross-origin destination; no user interaction is required.
The record
- CVE
- CVE-2026-55553
- Published
- Aug 25, 2026
- Updated
- Aug 25, 2026
- Vendor
- node-modules
- Product
- urllib
- Classifications
- CWE-201, CWE-522, CWE-200, T1528
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 25, 2026CVE publishedPublication date reported by the CVE source.
- Aug 25, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.44.1
- Affected versionversion=>= 3.0.0, < 4.9.1
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Three-container cross-origin redirect proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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