CVE catalog
CVE-2026-46527
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an atta
- Severity
- High · CVSS 8.7
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.33% · Oct 25, 2026
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, When the server has called Server::set_trusted_proxies() with a non-empty trusted-proxy list, an attacker can send an HTTP request that includes an X-Forwarded-For header whose value parses to no valid IP segments. The code path then executes get_client_ip(), which calls front() on an empty std::vector—undefined behavior in C++. On typical implementations this manifests as abnormal process termination (denial of service). With Sanitizers enabled, you get an explicit runtime diagnostic. This vulnerability is fixed in 0.44.0.
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 |
| Cpe | cpp-httplib | Not reported | Not reported | vulnerable |
| Cpe | cpp-httplib | Not reported | 0.44.0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | cpp-httplib | source | sid | (unfixed) | not yet assigned | Not reported | [1138578] |
| Debian | cpp-httplib | source | forky | (unfixed) | not yet assigned | Not reported | [1138578] |
| Debian | cpp-httplib | source | trixie | (unfixed) | not yet assigned | Not reported | [1138578] |
| Debian | cpp-httplib | source | bookworm | (unfixed) | not yet assigned | Not reported | [1138578] |
| Cpe | cpp-httplib | cpe | Not reported | 0.44.0 | Not reported | Not reported | Not reported |
Notes
[trixie] cpp-httplib: Minor issue [bookworm] cpp-httplib: Minor issue
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/csaf/opensuse-su-2026_10994-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-46527]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-46527]
- [https://security-tracker.debian.org/tracker/CVE-2026-46527]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46527.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]