PT-2026-44988 · Unknown · Cpp-Httplib

Jjjsmz · Published 2026-05-29 · Updated 2026-05-30 · CVE-2026-45372

Positive Technologies (AI Summary)

CVSS v3.1

9.9

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L

Name of the Vulnerable Software and Affected Versions cpp-httplib versions prior to 0.44.0

Description When the server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. Because the validity check is field value() is performed before decoding, encoded %0D%0A sequences pass the check and are subsequently expanded into literal r byte pairs within the stored header value.

Recommendations Update to version 0.44.0.

Exploit

Fix

HTTP Request/Response Smuggling

Weakness Enumeration

CWE-93

CWE-444

Related Identifiers

CVE-2026-45372

Affected Products

Cpp-Httplib

References · 5

• 🔥 https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-45372 · Security Note
• https://twitter.com/CVEnew/status/2060470652847509588 · Twitter Post
• https://twitter.com/vuldb/status/2060665338354860260 · Twitter Post
• https://t.me/CVEtracker/55300 · Telegram Post