Input validation error in Cpp-httplib - CVE-2026-45352
Published: May 12, 2026
Vulnerability identifier: #VU131106
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2026-45352
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Cpp-httplib
Fedora
openEuler
cpp-httplib
cpp-httplib-debuginfo
cpp-httplib-debugsource
cpp-httplib-devel
Fedora
openEuler
cpp-httplib
cpp-httplib-debuginfo
cpp-httplib-debugsource
cpp-httplib-devel
How to mitigate CVE-2026-45352
Install security update from vendor's website.
Cpp-httplib - update to 0.43.4
cpp-httplib - update to 0.46.0-1
cpp-httplib-debuginfo - update to 0.46.0-1
cpp-httplib-debugsource - update to 0.46.0-1
cpp-httplib-devel - update to 0.46.0-1
cpp-httplib - addressed in versions 0.48.0-1.el9, 0.48.0-1.el10_3, 0.48.0-1.fc43, 0.48.0-1.fc44
cpp-httplib - update to 0.46.0-1
cpp-httplib-debuginfo - update to 0.46.0-1
cpp-httplib-debugsource - update to 0.46.0-1
cpp-httplib-devel - update to 0.46.0-1
cpp-httplib - addressed in versions 0.48.0-1.el9, 0.48.0-1.el10_3, 0.48.0-1.fc43, 0.48.0-1.fc44