SB2026030950 - Fedora EPEL 9 update for cpp-httplib

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Main Vulnerability Database SB2026030950

SB2026030950 - Fedora EPEL 9 update for cpp-httplib

Published: March 9, 2026

Security Bulletin ID SB2026030950
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 4
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 4 vulnerabilities.


1) Uncontrolled recursion (CVE-ID: CVE-2026-29076)

CWE-ID: CWE-674 - Uncontrolled Recursion

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 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)

CWE-ID: CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

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 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)

CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor

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 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)

CWE-ID: CWE-93 - Improper Neutralization of CRLF Sequences ('CRLF Injection')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:U/U:Green


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.

References