How severe is CVE-2026-29046?

CVE-2026-29046 has a CVSS 3.x base score of 8.2, rated high 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 low.

Is CVE-2026-29046 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29046?

CVE-2026-29046 affects Ritlabs Tinyweb. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29046?

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

Does CVE-2026-29046 have an EU (EUVD) identifier?

Yes. CVE-2026-29046 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9972.

When was CVE-2026-29046 published?

CVE-2026-29046 was published on 2026-03-06 and last updated on 2026-06-17.

CVE-2026-29046

CVE-2026-29046 is a high-severity vulnerability in Ritlabs Tinyweb with a CVSS 3.x base score of 8.2. 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-20.

Key facts

Severity: High (CVSS 3.x base score 8.2)
CVSS v4: 9.2
EPSS exploit prediction: 0% (31st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9972
Weakness: CWE-20
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 2.04, TinyWeb accepts request header values and later maps them into CGI environment variables (HTTP_*). The parser did not strictly reject dangerous control characters in header lines and header values, including CR, LF, and NUL, and did not consistently defend against encoded forms such as %0d, %0a, and %00. This can enable header value confusion across parser boundaries and may create unsafe data in the CGI execution context. This issue has been patched in version 2.04.

Frequently asked questions

What is CVE-2026-29046?: TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Prior to version 2.04, TinyWeb accepts request header values and later maps them into CGI environment variables (HTTP_*). The parser did not strictly reject dangerous control characters in header lines and header values, including CR, LF, and NUL, and did not consistently defend against encoded forms such as %0d, %0a, and %00. This can enable header value confusion across parser boundaries and may create unsafe data in the CGI execution context. This issue has been patched in version 2.04.
How severe is CVE-2026-29046?: CVE-2026-29046 has a CVSS 3.x base score of 8.2, rated high 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 low.
Is CVE-2026-29046 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (31st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29046?: CVE-2026-29046 affects Ritlabs Tinyweb. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29046?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-29046 have an EU (EUVD) identifier?: Yes. CVE-2026-29046 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9972.
When was CVE-2026-29046 published?: CVE-2026-29046 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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