Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.2, when a cpp-httplib client is configured with a proxy and set_follow_location(true), any HTTPS redirect it follows will have TLS certificate and hostname verification silently disabled on the new connection. The client will accept any certificate presented by the redirect target — expired, self-signed, or forged — without raising an error or notifying the application. A network attacker in a position to return a redirect response can fully intercept the follow-up HTTPS connection, including any credentials or session tokens in flight. This vulnerability is fixed in 0.37.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| yhirose | cpp-httplib | < 0.37.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cpp-httplib | 0.41.0+ds-3 | — |
| Debian 13 | cpp-httplib | No fix yet | — |
| Debian 12 | cpp-httplib | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | cpp-httplib | No fix yet | — |
| Ubuntu 25.10 | cpp-httplib | No fix yet | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | cpp-httplib | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cpp-httplib | 0.38.0-1.1 | openSUSE-SU-2026:10435-1 |
Advisories 1
- openSUSE-SU-2026:10435-1 cpp-httplib-devel-0.38.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 27, 2026