SB20260625178 - Fedora EPEL 10.3 update for cpp-httplib
Published: June 25, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 6 vulnerabilities.
1) NULL pointer dereference (CVE-ID: CVE-2026-46527)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to undefined behavior from calling front() on an empty std::vector in get_client_ip() when handling HTTP requests with a crafted X-Forwarded-For header under trusted-proxy configuration. A remote attacker can send a specially crafted request to cause a denial of service.
Only deployments that configure a non-empty trusted-proxy list are vulnerable.
2) CRLF injection (CVE-ID: CVE-2026-45372)
CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/U:Green
The vulnerability allows a remote attacker to inject CRLF sequences into stored HTTP header values.
The vulnerability exists due to improper neutralization of CRLF sequences in the server-side parse_header function when parsing percent-encoded header values in incoming requests. A remote attacker can send a specially crafted request with encoded CRLF sequences to inject CRLF sequences into stored HTTP header values.
The issue can lead to inconsistent interpretation of header values by downstream application components, including response handling, logging, and proxying logic.
3) Input validation error (CVE-ID: CVE-2026-45352)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in ChunkedDecoder::read_payload when parsing chunked Transfer-Encoding request bodies. A remote attacker can send a specially crafted HTTP request with a negative chunk-size value to cause a denial of service.
The issue can cause unbounded memory allocation and process termination when the server accepts chunked request bodies.
4) Improper Certificate Validation (CVE-ID: CVE-2026-54919)
CWE-ID: CWE-295 - Improper Certificate Validation
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to disclose sensitive information and modify transmitted data.
The vulnerability exists due to improper certificate validation in the TLS certificate verification logic of SSLClient, Client in HTTPS mode, and WebSocketClient when connecting to IP-literal hosts over the Mbed TLS or wolfSSL backends. A remote attacker can present a crafted certificate during a man-in-the-middle attack to disclose sensitive information and modify transmitted data.
Only builds using the Mbed TLS or wolfSSL backends are affected, and the issue occurs when connecting to a host specified as an IP literal rather than a DNS hostname.
5) Information disclosure (CVE-ID: CVE-2026-33745)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to disclose sensitive credentials to an unauthorized host.
The vulnerability exists due to exposure of sensitive information to an unauthorized actor in ClientImpl::redirect() and redirect credential handling when following cross-origin HTTP redirects. A remote attacker can trigger a redirect to an attacker-controlled host to disclose sensitive credentials to an unauthorized host.
Requests are affected when redirect following is enabled and stored Basic Auth, Bearer Token, or Digest Auth credentials are configured. Cross-origin redirects may also cause credentials to be sent after an HTTPS-to-HTTP downgrade.
6) Inconsistent interpretation of HTTP requests (CVE-ID: CVE-2026-34441)
CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
The vulnerability allows a remote attacker to smuggle arbitrary HTTP requests.
The vulnerability exists due to inconsistent interpretation of HTTP requests in the static file handler and request parsing logic when processing GET requests with a body on HTTP/1.1 keep-alive connections or requests containing both Content-Length and Transfer-Encoding headers. A remote attacker can send a specially crafted GET request with an embedded HTTP request to smuggle arbitrary HTTP requests.
When deployed behind a reverse proxy, the issue can enable proxy-backend desynchronization and proxy-level access control bypass.
Remediation
Install update from vendor's website.