CVE catalog
CVE-2026-33745
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.39.0, the cpp-httplib HTTP client forwards stored Basic Auth, Bearer Token, and Digest Auth credentials to
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.27% · Oct 25, 2026
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.39.0, the cpp-httplib HTTP client forwards stored Basic Auth, Bearer Token, and Digest Auth credentials to arbitrary hosts when following cross-origin HTTP redirects (301/302/307/308). A malicious or compromised server can redirect the client to an attacker-controlled host, which then receives the plaintext credentials in the `Authorization` header. Version 0.39.0 fixes the issue.
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 | fixed |
| Debian | cpp-httplib | forky | 0.41.0+ds-3 | fixed |
| 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 | 0.39.0 | fixed |
| Opensuse | cpp-httplib | tumbleweed | 0.42.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | cpp-httplib | source | sid | 0.41.0+ds-3 | not yet assigned | Not reported | [1132162] |
| Debian | cpp-httplib | source | forky | 0.41.0+ds-3 | not yet assigned | Not reported | [1132162] |
| Debian | cpp-httplib | source | trixie | (unfixed) | not yet assigned | Not reported | [1132162] |
| Debian | cpp-httplib | source | bookworm | (unfixed) | not yet assigned | Not reported | [1132162] |
| Cpe | cpp-httplib | cpe | Not reported | 0.39.0 | Not reported | Not reported | Not reported |
| Opensuse | cpp-httplib | rpm | tumbleweed | 0.42.0-1.1 | Not reported | OPENSUSE-SU-2026:10573-1 | 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
[openSUSE Tumbleweed]
- [cpp-httplib-devel]Unknown
Source package: [cpp-httplib]
Details (1)
0.49.0-1.2· x86_64 · tumbleweedUnknown · Fixed:
0.42.0-1.1Version impact unknown
nvd · cpp-httplib · opensuse · tumbleweed
- [libcpp-httplib0_49]Unknown
Source package: [cpp-httplib]
Details (1)
0.49.0-1.2· x86_64 · tumbleweedUnknown · Fixed:
0.42.0-1.1Version impact unknown
nvd · cpp-httplib · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10573-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-33745]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-33745]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10573-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-33745]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-33745.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]