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CVE-2026-77341— cpp-httplib: CRLF injection via unvalidated HTTP trailer headers in chunked response writing

Quick assessment

Affected
yhirose cpp-httplib
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.

yhirose cpp-httplib是yhirose个人开发者开源的一个C++实现的HTTP客户端与服务器开发框架。 yhirose cpp-httplib 0.49.0版本至0.50.0之前版本存在输入验证错误漏洞，该漏洞源于分块响应尾部输出路径未对尾部字段名和值进行验证，允许CRLF序列注入，可能导致HTTP响应拆分，攻击者能够伪造响应头或注入第二个响应。

CVSS 5.3 · Medium EPSS 0.46% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
yhirose cpp-httplib >= 0.49.0, < 0.50.0 affected
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I. Basic Information for CVE-2026-77341

Vulnerability Information
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Vulnerability Title
cpp-httplib: CRLF injection via unvalidated HTTP trailer headers in chunked response writing
Source: CVE Program / CVE List V5
Vulnerability Description
cpp-httplib is a C++ header-only HTTP/HTTPS library. In version 0.49.0, the chunked-response trailer output path writes trailer header names and values directly to the socket without validating them, allowing CRLF sequences in a trailer field to inject additional headers or split the HTTP response. Unlike every other header-writing path in the library, the trailer-writing code applies none of the field-name and field-value checks that reject carriage return and line feed, so an application that places attacker-influenced data into a chunked response trailer emits attacker-controlled CRLF onto the wire. This enables HTTP response splitting, letting an attacker forge response headers or inject a second response. This issue is fixed in version 0.50.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA: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
yhirose cpp-httplib 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
yhirose cpp-httplib是yhirose个人开发者开源的一个C++实现的HTTP客户端与服务器开发框架。 yhirose cpp-httplib 0.49.0版本至0.50.0之前版本存在输入验证错误漏洞，该漏洞源于分块响应尾部输出路径未对尾部字段名和值进行验证，允许CRLF序列注入，可能导致HTTP响应拆分，攻击者能够伪造响应头或注入第二个响应。
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
yhirose cpp-httplib >= 0.49.0, < 0.50.0 -

II. Public POCs for CVE-2026-77341

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III. Intelligence Information for CVE-2026-77341

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Patches & Fixes for CVE-2026-77341 (1)

Vendor Advisories for CVE-2026-77341 (1)

IV. Related Vulnerabilities

Same product: cpp-httplib
Same vendor: yhirose
Same weakness: CWE-93

V. Comments for CVE-2026-77341

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