MediumFix available
cpp-httplib — security advisory
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can supply X-Forwarded-For or X-Real-IP headers which get accepted unconditionally by get_client_ip() in docker/main.cc, causing access and error logs (nginx_access_logger / nginx_error_logger) to record spoofed client IPs (log poisoning / audit evasion). This vulnerability is fixed in 0.27.0.
- Products
- cpp-httplib
- Affected versions
- 0.10.1+ds-1, 0.10.2+ds-1, 0.10.3+ds-1, 0.13.1+ds-1ubuntu1, 0.14.3+ds-1, 0.14.3+ds-1.1, 0.14.3+ds-1.1build1, 0.14.3+ds-1.1build2, 0.18.7-1, 0.26.0+ds-2ubuntu2, 0.26.0+ds-2ubuntu3, 0.26.0+ds-2ubuntu3+esm1, 0.26.0+ds-2ubuntu4, 0.9.10+ds-1, 0.9.9+ds-1
- Fixed versions
- 0.10.3+ds-1ubuntu0.1~esm1, 0.14.3+ds-1.1ubuntu0.1~esm1, 0.18.7-1ubuntu0.25.10.1
- CVEs
- CVE-2025-66577
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 01:55 UTC · Revision 1
Source evidence
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.27.0, a vulnerability allows attacker-controlled HTTP headers to influence server-visible metadata, logging, and authorization decisions. An attacker can supply X-Forwarded-For or X-Real-IP headers which get accepted unconditionally by get_client_ip() in docker/main.cc, causing access and error logs (nginx_access_logger / nginx_error_logger) to record spoofed client IPs (log poisoning / audit evasion). This vulnerability is fixed in 0.27.0.
osv:UBUNTU-CVE-2025-66577
cpp-httplib
Fixed versions: 0.10.3+ds-1ubuntu0.1~esm1
cpp-httplib
Fixed versions: 0.14.3+ds-1.1ubuntu0.1~esm1
cpp-httplib
Fixed versions: 0.18.7-1ubuntu0.25.10.1
cpp-httplib
Fixed versions: Not specified
cpp-httplib
Fixed versions: Not specified
Complete source record
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"modified": "2026-10-17T12:57:37.725056067Z",
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