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CVE-2026-1527 is a medium severity vulnerability with a CVSS score of 4.6. No known exploits currently, and patches are available.
Very low probability of exploitation
EPSS predicts the probability of exploitation in the next 30 days based on real-world threat data, complementing CVSS severity scores with actual risk assessment.
When an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:
The vulnerability exists because undici writes the upgrade value directly to the socket without validating for invalid header characters:
// lib/dispatcher/client-h1.js:1121
if (upgrade) {
header += `connection: upgrade\r\nupgrade: ${upgrade}\r\n`
}
Patched in the undici version v7.24.0 and v6.24.0. Users should upgrade to this version or later.
Sanitize the upgrade option string before passing to undici:
function sanitizeUpgrade(value) {
if (/[\r\n]/.test(value)) {
throw new Error('Invalid upgrade value')
}
return value
}
client.request({
upgrade: sanitizeUpgrade(userInput)
})
| Vendor | Product |
|---|---|
| Node.js | Undici |
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