Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-15157— undici vulnerable to CRLF Injection via blob-like body 'type' property

Quick assessment

Affected
undici undici
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

undici undici是undici组织的一个HTTP客户端库。 undici 6.28.0之前版本、7.0.0版本至7.29.0之前版本和8.0.0版本至8.9.0之前版本存在输入验证错误漏洞，该漏洞源于未验证类blob请求体的type属性，可能导致攻击者注入CRLF序列并附加任意HTTP头，从而走私第二个请求。

CVSS 4.2 · Medium EPSS 0.15% · P5

Possible ATT&CK Techniques 1 AI

T1102 · Web Service

Affected Version Matrix 6

VendorProduct Version RangeStatus
undici undici < 6.28.0 affected
6.28.0 unaffected
7.0.0< 7.29.0 affected
7.29.0 unaffected
8.0.0< 8.9.0 affected
8.9.0 unaffected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-15157

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
undici vulnerable to CRLF Injection via blob-like body 'type' property
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
undici 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
undici undici是undici组织的一个HTTP客户端库。 undici 6.28.0之前版本、7.0.0版本至7.29.0之前版本和8.0.0版本至8.9.0之前版本存在输入验证错误漏洞，该漏洞源于未验证类blob请求体的type属性，可能导致攻击者注入CRLF序列并附加任意HTTP头，从而走私第二个请求。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
undici undici 0 ~ 6.28.0 -

II. Public POCs for CVE-2026-15157

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-15157

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-15157 (1)

Same Patch Batch · undici · 2026-07-29 · 5 CVEs total

CVE-2026-13697 7.4 HIGH undici vulnerable to cross-user information disclosure and parse-time crash via degenerate
CVE-2026-14643 5.9 MEDIUM undici vulnerable to cross-user information disclosure via whitespace around equals in Cac
CVE-2026-16729 4.8 MEDIUM undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCoo
CVE-2026-16728 4.8 MEDIUM undici vulnerable to downstream response desynchronization via retry interceptor

IV. Related Vulnerabilities

Same product: undici
Same vendor: undici
Same weakness: CWE-93

V. Comments for CVE-2026-15157

No comments yet

Leave a comment