EUVD-2026-11701
GHSA-4992-7rv2-5pvq
Severity by source
AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
4Blast Radius
ecosystem impact- 28 npm packages depend on undici (16 direct, 23 indirect)
Ecosystem-wide dependent count for version 7.0.0.
DescriptionCVE.org
ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:
- Inject arbitrary HTTP headers
- Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)
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 }
AnalysisAI
CRLF injection in undici's HTTP upgrade handling allows authenticated attackers to inject arbitrary headers and perform request smuggling attacks against backend services like Redis and Elasticsearch when user input is passed unsanitized to the upgrade option. The vulnerability stems from insufficient validation of the upgrade parameter before writing to the socket, enabling attackers to terminate HTTP requests prematurely and route malicious data to non-HTTP protocols. This requires prior authentication and user interaction, with no patch currently available.
Technical ContextAI
ImpactWhen an application passes user-controlled input to the upgrade option of client.request(), an attacker can inject CRLF sequences (\r\n) to:
- Inject arbitrary HTTP headers
- Terminate the HTTP request prematurely and smuggle raw data to non-HTTP services (Redis, Memcached, Elasticsearch)
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) { heade
RemediationAI
Monitor vendor advisories for a patch. Restrict network access to the affected service where possible.
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Same technique Code Injection
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| SUSE Liberty Linux 10 | Fixed |
| SUSE Liberty Linux 8 | Fixed |
| SUSE Liberty Linux 9 | Fixed |
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External POC / Exploit Code
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