undici does not validate the type property of a duck-typed blob-like request body before using it as the Content-Type header on the HTTP/1.1 dispatcher. In undici before 6.28.0, from 7.0.0 up to before 7.29.0, and from 8.0.0 up to before 8.9.0, an application that passes a hand-rolled blob-like body (via request, stream, pipeline, or dispatch) whose type is derived from untrusted input allows an attacker to inject CRLF sequences and append arbitrary HTTP headers, potentially smuggling a second request past the upstream. Native Blob objects are safe because their constructor strips CRLF from the type, and fetch is unaffected because it validates headers, but ecosystem libraries that build duck-typed blob shapes from user input can reach the vulnerable path. This is the same defect class as CVE-2022-35948 and CVE-2026-1527, on a header sink that the earlier fixes did not cover. The issue is fixed in undici 6.28.0, 7.29.0, and 8.9.0.
References
| Link | Resource |
|---|---|
| https://cna.openjsf.org/security-advisories.html | Vendor Advisory |
| https://github.com/nodejs/undici/security/advisories/GHSA-m8rv-5g2x-5cg5 | Mitigation Vendor Advisory |
Configurations
Configuration 1 (hide)
|
History
04 Aug 2026, 15:41
| Type | Values Removed | Values Added |
|---|---|---|
| First Time |
Nodejs
Nodejs undici |
|
| References | () https://cna.openjsf.org/security-advisories.html - Vendor Advisory | |
| References | () https://github.com/nodejs/undici/security/advisories/GHSA-m8rv-5g2x-5cg5 - Mitigation, Vendor Advisory | |
| CPE | cpe:2.3:a:nodejs:undici:*:*:*:*:*:node.js:*:* |
29 Jul 2026, 22:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-07-29 22:16
Updated : 2026-08-04 15:41
NVD link : CVE-2026-15157
Mitre link : CVE-2026-15157
CVE.ORG link : CVE-2026-15157
JSON object : View
Products Affected
nodejs
- undici
CWE
CWE-93
Improper Neutralization of CRLF Sequences ('CRLF Injection')