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{"cveTags": [], "descriptions": [{"lang": "en", "value": "follow-redirects is an open source, drop-in replacement for Node's `http` and `https` modules that automatically follows redirects. Prior to 1.16.0, when an HTTP request follows a cross-domain redirect (301/302/307/308), follow-redirects only strips authorization, proxy-authorization, and cookie headers (matched by regex at index.js). Any custom authentication header (e.g., X-API-Key, X-Auth-Token, Api-Key, Token) is forwarded verbatim to the redirect target. This vulnerability is fixed in 1.16.0."}], "id": "CVE-2026-40895", "lastModified": "2026-04-22T21:24:26.997", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 6.9, "baseSeverity": "MEDIUM", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "NONE", "vulnConfidentialityImpact": "LOW", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-04-21T21:16:44.337", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/follow-redirects/follow-redirects/security/advisories/GHSA-r4q5-vmmm-2653"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-200"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,1.16.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "follow-redirects", "source": "cna", "vendor": "follow-redirects"}, "product": "follow_redirects", "vendor": "follow-redirects"}], "analysis": {"en": {"generated_at": "2026-04-22T06:42:39.744586+00:00", "value": {"mitigation_remediation": ["Update the follow\u2011redirects package to version 1.16.0 or later to ensure custom authentication headers are stripped from cross\u2011domain redirects.", "Audit application code to identify any transmissions of custom authentication headers on requests that may trigger cross\u2011domain redirects, and either remove those headers or restructure the request logic so that sensitive headers are not sent to external domains.", "Implement network monitoring or WAF rules to detect unexpected cross\u2011domain redirects that include authentication headers, enabling rapid identification of potential abuse."], "summary": {"action": "Immediate Patch", "impact": "Unauthorized disclosure of authentication credentials"}, "threat_synthesis": {"affected_systems": "Any Node.js application that uses the follow\u2011redirects package, version 1.15.x or earlier, is affected. The vulnerability is mitigated in releases 1.16.0 and later. Applications should verify the installed package version or upgrade to the current release to remove the behavior.", "description_and_impact": "Prior to version 1.16.0, the follow-redirects library forwarded custom authentication headers such as X-API-Key or X-Auth-Token when following cross\u2011domain redirects (301/302/307/308). These headers were not stripped, allowing an attacker to capture the credentials that were intended for the original target. The primary impact is the unauthorized disclosure of authentication credentials, which could enable an attacker to gain elevated access to downstream services. The weakness is classified as CWE\u2011200.", "risk_and_exploitability": "The CVSS score of 6.9 indicates a medium severity risk. Because the exploit requires only an HTTP request that triggers a cross\u2011domain redirect, it is relatively easy to execute from remote or local code that uses the library. The EPSS score is not available, but the lack of listing in the CISA KEV catalog suggests no widespread active exploits have been observed yet. Nevertheless, the potential for credential leakage makes it prudent to address promptly, especially in environments that expose sensitive API keys or tokens."}}}}, "created": "2026-04-22T04:15:07.393302+00:00", "updated": "2026-04-22T06:45:10.878529+00:00", "vendors": ["follow-redirects", "follow-redirects$PRODUCT$follow_redirects"]}