CVE-2026-1527

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,6.24.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.0.0,7.24.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.24.0,7.24.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "undici", "source": "cna", "vendor": "undici"}, "product": "undici", "vendor": "undici"}], "analysis": {"en": {"generated_at": "2026-03-20T17:30:25.964701+00:00", "value": {"mitigation_remediation": ["Upgrade undici to a patched version that validates the upgrade option", "If immediate upgrade is not possible, sanitize or validate the upgrade option value to ensure it does not contain CR or LF characters before sending", "Disable the upgrade option for any user-controlled input if it is not required by the application", "Monitor for vendor updates and apply patches as soon as they become available"], "summary": {"action": "Apply Patch", "impact": "CRLF injection allowing arbitrary HTTP header injection and request smuggling to non-HTTP services"}, "threat_synthesis": {"affected_systems": "The affected product is undici, the HTTP client library used within Node.js environments. No specific version information is provided in the advisory, so any deployment that uses undici's upgrade option and accepts user-controlled input may be affected.", "description_and_impact": "The vulnerability allows an attacker to inject CRLF sequences into the upgrade option of undici's client.request(), permitting arbitrary HTTP header injection and premature request termination. This can result in data smuggling into services such as Redis, Memcached, or Elasticsearch, potentially exposing sensitive information or enabling further exploitation. The weakness corresponds to CWE\u201193 (CRLF Injection).", "risk_and_exploitability": "The CVSS score of 4.6 rates the vulnerability as moderate, and the EPSS score indicates a very low probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Based on the description, the likely attack vector is external; an attacker can craft a request with a malicious upgrade field that contains CRLF sequences to trigger header injection and smuggling. The impact applies when the application forwards such requests to non-HTTP services, and while the overall risk is moderate, the potential to expose data to services like Redis or Elasticsearch is significant."}}}}, "created": "2026-03-13T09:49:50.236277+00:00", "updated": "2026-03-23T10:00:27.090854+00:00", "vendors": ["undici", "undici$PRODUCT$undici"]}