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CVE-2026-28435

Yhirose Cpp-httplib denial of service

7.5 HIGHPublic exploitEPSS 0.62%
  1. Published4 Mar 2026

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.35.0, cpp-httplib (httplib.h) does not enforce Server::set_payload_max_length() on the decompressed request body when using HandlerWithContentReader (streaming ContentReader) with Content-Encoding: gzip (or other supported encodings). A small compressed payload can expand beyond the configured payload limit and be processed by the application, enabling a payload size limit bypass and potential denial of service (CPU/memory exhaustion). This vulnerability is fixed in 0.35.0.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Yhirose Cpp-httplib< 0.35.0

Remediation

Fixed in
Yhirose Cpp-httplib≥ 0.35.0

References

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Frequently asked

Is CVE-2026-28435 being actively exploited?

CVE-2026-28435 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.62%.

How severe is CVE-2026-28435?

CVE-2026-28435 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.62% probability of exploitation.

Which products are affected by CVE-2026-28435?

Affected products include Yhirose Cpp-httplib.

How do I fix CVE-2026-28435?

Upgrade affected software to a fixed version, for example Yhirose Cpp-httplib 0.35.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28435 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.