CVE-2025-53629

cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability

Published Jul 10, 2025 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This vulnerability is related to CVE-2025-53628.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6228-1 cpp-httplib security update
EUVD EUVD EUVD-2025-21055 cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This vulnerability is related to CVE-2025-53628.
History
Type Values Removed Values Added
CPEs cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics epss

{'score': 0.00038}

epss

{'score': 0.0005}

Type Values Removed Values Added
Metrics epss

{'score': 0.00038}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.23.0, incoming requests using Transfer-Encoding: chunked in the header can allocate memory arbitrarily in the server, potentially leading to its exhaustion. This vulnerability is fixed in 0.23.0. NOTE: This vulnerability is related to CVE-2025-53628.
Title cpp-httplib Unbounded Memory Allocation in Chunked/No-Length Requests Vulnerability
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 10, 2025, 8:19 PM
Reserved
Jul 7, 2025, 2:20 PM
Status
Analyzed
Published
Jul 10, 2025, 8:15 PM
Modified
Jun 17, 2026, 9:38 AM