How severe is CVE-2026-28497?

CVE-2026-28497 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-28497 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28497?

CVE-2026-28497 affects Ritlabs Tinyweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28497?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-28497 have an EU (EUVD) identifier?

Yes. CVE-2026-28497 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9969.

When was CVE-2026-28497 published?

CVE-2026-28497 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-28497

CVE-2026-28497 is a critical-severity vulnerability in Ritlabs Tinyweb with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 9.3
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9969
Weakness: CWE-190
Affected product: Ritlabs Tinyweb
Published: 2026-03-06
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-28497?: 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.
How severe is CVE-2026-28497?: CVE-2026-28497 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-28497 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28497?: CVE-2026-28497 affects Ritlabs Tinyweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28497?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-28497 have an EU (EUVD) identifier?: Yes. CVE-2026-28497 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9969.
When was CVE-2026-28497 published?: CVE-2026-28497 was published on 2026-03-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ritlabs:tinyweb:*:*:*:*:*:*:*:*

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