Payload Limit Bypass in cpp-httplib HTTP/HTTPS Library
CVE-2026-28435

7.5HIGH

Key Information:

Vendor

Yhirose

Status
Cpp-httplib
Vendor
CVE Published:
4 March 2026

What is CVE-2026-28435?

The cpp-httplib library, prior to version 0.35.0, contains a vulnerability in its handling of compressed request bodies. Specifically, when processing requests encoded with gzip or other supported content encodings using HandlerWithContentReader, the library fails to properly enforce the maximum payload limit on the decompressed request body. This oversight allows attackers to deliver small compressed payloads that can expand beyond the configured limit, potentially leading to denial of service through CPU or memory exhaustion. Users are advised to upgrade to version 0.35.0 or later to mitigate this issue.

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Affected Version(s)

cpp-httplib < 0.35.0

References

https://github.com/yhirose/cpp-httplib/security/advisorie...
x_refsource_CONFIRM
https://github.com/yhirose/cpp-httplib/commit/c99d7472b5c...
x_refsource_MISC

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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