CVE-2026-45372— cpp-httplib: HTTP header value percent-decoding in server-side `parse_header` enables CRLF injection
Possible ATT&CK Techniques 3AI
T1071 · Application Layer Protocol T1190 · Exploit Public-Facing Application T1557 · Adversary-in-the-MiddleGet alerts for future matching vulnerabilitiesLog in to subscribe
I. Basic Information for CVE-2026-45372
Vulnerability Information
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Vulnerability Title
cpp-httplib: HTTP header value percent-decoding in server-side `parse_header` enables CRLF injection
Source: NVD (National Vulnerability Database)
Vulnerability Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: NVD (National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| yhirose | cpp-httplib | < 0.44.0 | - |
II. Public POCs for CVE-2026-45372
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-45372 (1)
Same Patch Batch · yhirose · 2026-05-29 · 3 CVEs total
| CVE-2026-45352 | 5.3 MEDIUM | cpp-httplib DoS: Negative chunk-size in chunked Transfer-Encoding |
| CVE-2026-46527 | cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy Configuration Triggers Empty |
IV. Related Vulnerabilities
Same product: cpp-httplib
- CVE-2026-46527
cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy - CVE-2026-45352
cpp-httplib DoS: Negative chunk-size in chunked Transfer-Enc - CVE-2026-34441
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Reque - CVE-2026-33745
cpp-httplib Client Leaks Authentication Credentials to Untru - CVE-2026-32627
cpp-httplib has a Silent TLS Certificate Verification Bypass
Same vendor: yhirose
- CVE-2026-46527
cpp-httplib: Malicious `X-Forwarded-For` Under Trusted-Proxy - CVE-2026-45352
cpp-httplib DoS: Negative chunk-size in chunked Transfer-Enc - CVE-2026-34441
cpp-httplib: HTTP Request Smuggling via Unconsumed GET Reque - CVE-2026-33745
cpp-httplib Client Leaks Authentication Credentials to Untru - CVE-2026-32627
cpp-httplib has a Silent TLS Certificate Verification Bypass
Same weakness: CWE-93
- CVE-2026-49130
Music Player Daemon < 0.24.11 CRLF Injection via XspfPlaylis - CVE-2026-46740
Mojolicious::Plugin::Statsd versions through 0.04 for Perl a - CVE-2026-44214
eventsource-encoder: SSE event injection via unsanitized eve - CVE-2026-47072
CRLF injection in WebSocket upgrade request in hackney - CVE-2026-47075
CR/LF injection in query parameter in hackney
V. Comments for CVE-2026-45372
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