CVE-2026-28497: TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32

Q: How do I fix CVE-2026-28497?

tinyweb: upgrade to 2.03. Exact commands for each OS are on this page.

Q: Is CVE-2026-28497 being exploited?

CVE-2026-28497 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-28497 affect?

CVE-2026-28497 affects tinyweb. Severity is critical (CVSS 9.1). 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-Lengt

Q: How urgent is CVE-2026-28497?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-28497 is a critical-severity flaw (CVSS 9.1) affecting tinyweb. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 (K

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-190, CWE-444
Published	2026-03-06
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: ritlabs

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-06 04:16 UTCPublished CVE record published
2026-06-17 10:28 UTCUpdated Record last modified

ritlabs tinyweb UPGRADE

Affected: < 2.03

Fixed in: 2.03

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tinyweb || rpm -q tinyweb || tinyweb --version

2. UPGRADE to 2.03 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tinyweb

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tinyweb

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-28497?

tinyweb: upgrade to 2.03. Exact commands for each OS are on this page.

Is CVE-2026-28497 being exploited?

CVE-2026-28497 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-28497 affect?

CVE-2026-28497 affects tinyweb. Severity is critical (CVSS 9.1). 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-Lengt

How urgent is CVE-2026-28497?

Priority 52/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-29046 HIGH 8.2 UPGRADE TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32
CVE-2026-27633 HIGH 7.5 UPGRADE TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32
CVE-2026-27630 HIGH 7.5 UPGRADE TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32
CVE-2026-27613 CRITICAL 9.8 UPGRADE TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32
CVE-2026-22781 CRITICAL 9.8 UPGRADE TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32

References

← Back to latest CVEs