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CVE-2026-28497

Ritlabs Tinyweb integer overflow

9.1 CRITICALPublic exploitEPSS 0.69%
  1. Published6 Mar 2026

Description

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Prior to version 2.03, an integer overflow vulnerability in the string-to-integer conversion routine (_Val) allows an unauthenticated remote attacker to bypass Content-Length restrictions and perform HTTP Request Smuggling. This can lead to unauthorized access, security filter bypass, and potential cache poisoning. The impact is critical for servers using persistent connections (Keep-Alive). This issue has been patched in version 2.03.

CVSS 3.1 breakdown

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

Affected products

Ritlabs Tinyweb< 2.03

Remediation

Fixed in
Ritlabs Tinyweb≥ 2.03

References

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Frequently asked

Is CVE-2026-28497 being actively exploited?

CVE-2026-28497 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.69%.

How severe is CVE-2026-28497?

CVE-2026-28497 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.69% probability of exploitation.

Which products are affected by CVE-2026-28497?

Affected products include Ritlabs Tinyweb.

How do I fix CVE-2026-28497?

Upgrade affected software to a fixed version, for example Ritlabs Tinyweb 2.03 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28497 against the real software inventory on every managed device, every day. 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.