CVE-2026-15157 (GCVE-0-2026-15157)

Vulnerability from cvelistv5 – Published: 2026-07-29 21:17 – Updated: 2026-07-30 15:18
VLAI
Title
undici vulnerable to CRLF Injection via blob-like body 'type' property
Summary
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.
Severity
4.2 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
Assigner
References
Impacted products
Vendor Product Version
undici undici Affected: 0 , < 6.28.0 (semver)
Unaffected: 6.28.0 (semver)
Affected: 7.0.0 , < 7.29.0 (semver)
Unaffected: 7.29.0 (semver)
Affected: 8.0.0 , < 8.9.0 (semver)
Unaffected: 8.9.0 (semver)
Create a notification for this product.
Credits
mcollina UlisesGascon
Show details on NVD website
To clipboard 

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