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CVE-2025-53628

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Date: July 10, 2025

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.

Severity Score

Related Resources (6)

https://security-tracker.debian.org/tracker/CVE-2025-53628
https://nvd.nist.gov/vuln/detail/CVE-2025-53628
https://github.com/yhirose/cpp-httplib/commit/7b752106ac42bd5b907793950d9125a0972c8e8e
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-j6p8-779x-p5pw
https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-qjmq-h3cc-qv6w
https://www.mend.io/vulnerability-database/CVE-2025-53628

Severity Score

Weakness Type (CWE)

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

CWE-444

Loop with Unreachable Exit Condition ('Infinite Loop')

CWE-835

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade Version

Upgrade to version cpp-httplib - 0.20.1;https://github.com/yhirose/cpp-httplib.git - v0.20.1

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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