Bug 2426666 (CVE-2026-21428) - CVE-2026-21428 cpp-httplib: cpp-httplib: Server-Side Request Forgery via header injection
Summary: CVE-2026-21428 cpp-httplib: cpp-httplib: Server-Side Request Forgery via head...
Keywords:
Status: NEW
Alias: CVE-2026-21428
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
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Depends On: 2426696 2426697 2426698 2426699 2426700
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-01-01 18:01 UTC by OSIDB Bzimport
Modified: 2026-01-01 21:24 UTC (History)
0 users

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Description OSIDB Bzimport 2026-01-01 18:01:20 UTC 
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines.
This vulnerability allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack. When combined with a server that supports http1.1 pipelining (springboot, python twisted etc), this can be used for server side request forgery (SSRF). Version 0.30.0 fixes this issue.
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