CVE catalog
CVE-2026-103930
cpp-httplib is a C++ header-only HTTP/HTTPS library. From 0.29.0 until 0.51.0, Client::open_stream in httplib.h accepts a caller-controlled path that reaches detail::write_request_line() without the d
- Severity
- Low · CVSS 3.7
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 25, 2026
cpp-httplib is a C++ header-only HTTP/HTTPS library. From 0.29.0 until 0.51.0, Client::open_stream in httplib.h accepts a caller-controlled path that reaches detail::write_request_line() without the detail::encode_path() protection used by the ordinary buffered request path. Raw carriage-return and line-feed bytes in the path can therefore split the outbound HTTP/1.1 request line and inject attacker-shaped request metadata. Exploitation requires an embedding application to pass remote user input into the open_stream path and a backend or intermediary that interprets the injected bytes; the established impact is modification of backend-visible request data, not direct confidentiality or availability impact. This issue is fixed in version 0.51.0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | cpp-httplib | sid | 0.41.0+ds-3 | vulnerable |
| Debian | cpp-httplib | forky | 0.41.0+ds-3 | vulnerable |
| Debian | cpp-httplib | trixie | 0.18.7-1+deb13u1 | vulnerable |
| Debian | cpp-httplib | trixie-security | 0.18.7-1+deb13u1 | vulnerable |
| Debian | cpp-httplib | bookworm | 0.11.4+ds-1+deb12u1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | cpp-httplib | source | sid | (unfixed) | not yet assigned | Not reported | [1151203] |
| Debian | cpp-httplib | source | forky | (unfixed) | not yet assigned | Not reported | [1151203] |
| Debian | cpp-httplib | source | trixie | (unfixed) | not yet assigned | Not reported | [1151203] |
| Debian | cpp-httplib | source | bookworm | (unfixed) | not yet assigned | Not reported | [1151203] |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libcpp-httplib0.11]Affected
Source package: [cpp-httplib]
Details (2)
0.11.4+ds-1+deb12u1· amd64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
0.11.4+ds-1+deb12u1· arm64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
- [libcpp-httplib-dev]Affected
Source package: [cpp-httplib]
Details (2)
0.11.4+ds-1+deb12u1· amd64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
0.11.4+ds-1+deb12u1· arm64 · bookwormAffected
nvd · cpp-httplib · debian · bookworm; nvd · cpp-httplib · debian · 12
[Debian 13 (Trixie)]
- [libcpp-httplib0.18]Affected
Source package: [cpp-httplib]
Details (4)
0.18.7-1+deb13u1· amd64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· amd64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
- [libcpp-httplib0.41]Affected
Source package: [cpp-httplib]
Details (2)
0.41.0+ds-3~bpo13+1· amd64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
0.41.0+ds-3~bpo13+1· arm64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
- [libcpp-httplib-dev]Affected
Source package: [cpp-httplib]
Details (6)
0.18.7-1+deb13u1· amd64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixieAffected
nvd · cpp-httplib · debian · 13
0.41.0+ds-3~bpo13+1· amd64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
0.41.0+ds-3~bpo13+1· arm64 · trixie-backportsAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· amd64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
0.18.7-1+deb13u1· arm64 · trixie-securityAffected
nvd · cpp-httplib · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-103930]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-103930]
- [https://security-tracker.debian.org/tracker/CVE-2026-103930]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-103930.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]