CVE-2025-53628

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.20.1, cpp-httplib does not have a limit for a unique line, permitting an attacker to explore this to allocate memory arbitrarily. This vulnerability is fixed in 0.20.1. NOTE: This vulnerability is related to CVE-2025-53629.

CVSS v4.0

6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.44% chance of exploitation in the next 30 days, 37th percentile

Published

2025-07-10

Proof-of-concept exploits (1)

• yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pw

References

• CVE Record
• NVD entry

Related

• CVE-2020-11709
• CVE-2020-23914
• CVE-2020-23915
• CVE-2025-46728
• CVE-2025-53629
• CVE-2025-53626