SB2026030950 - Fedora EPEL 9 update for cpp-httplib
Published: March 9, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Uncontrolled recursion (CVE-ID: CVE-2026-29076)
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists in std::regex when parsing RFC 5987 encoded filename* values in multipart Content-Disposition headers. A remote attacker can send a specially crafted HTTP POST request and cause uncontrolled stack growth, leading to a denial of service condition.
2) Improper handling of highly compressed data (CVE-ID: CVE-2026-28435)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to the application does not enforce Server::set_payload_max_length() on the decompressed request body when using HandlerWithContentReader. A remote attacker can supply a specially crafted gzip data to the application and consume all available CPU and memory resources leading to a denial of service condition.
3) Information disclosure (CVE-ID: CVE-2026-28434)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to the library outputs error handling messages in HTTP responses. A remote attacker can send a specially crafted HTTP request and gain access to sensitive information.
4) CRLF injection (CVE-ID: CVE-2026-21428)
The vulnerability allows a remote attacker to inject arbitrary HTTP headers.
The vulnerability exists due to insufficient validation of attacker-supplied data. A remote attacker can send a specially crafted HTTP request to the application containing CR-LF characters and modify application behavior. When combined with a server that supports http1.1 pipelining this can be used for server side request forgery attacks.
Remediation
Install update from vendor's website.