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CVE-2026-22776

Yhirose Cpp-httplib vulnerability

7.5 HIGHPublic exploitEPSS 0.40%
  1. Published12 Jan 2026

Description

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.1, a Denial of Service (DoS) vulnerability exists in cpp-httplib due to the unsafe handling of compressed HTTP request bodies (Content-Encoding: gzip, br, etc.). The library validates the payload_max_length against the compressed data size received from the network, but does not limit the size of the decompressed data stored in memory.

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< 0.30.1

Remediation

Fixed in
Yhirose Cpp-httplib≥ 0.30.1

References

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Frequently asked

Is CVE-2026-22776 being actively exploited?

CVE-2026-22776 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.40%.

How severe is CVE-2026-22776?

CVE-2026-22776 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.40% probability of exploitation.

Which products are affected by CVE-2026-22776?

Affected products include Yhirose Cpp-httplib.

How do I fix CVE-2026-22776?

Upgrade affected software to a fixed version, for example Yhirose Cpp-httplib 0.30.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-22776 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.