CVE-2026-12200

Ritlabs TinyWeb Server Header libeay32.dll.html stack-based overflow

Published Jun 15, 2026 CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Description

A security vulnerability has been detected in Ritlabs TinyWeb Server up to 1.94 on Win32. This impacts an unknown function in the library libeay32.dll.html of the component Header Handler. The manipulation of the argument Authorization leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Ritlabs

TinyWeb Server

affected

Version	Status	Constraints
`1.0`	affected	—
`1.1`	affected	—
`1.2`	affected	—
`1.3`	affected	—
`1.4`	affected	—
`1.5`	affected	—
`1.6`	affected	—
`1.7`	affected	—
`1.8`	affected	—
`1.9`	affected	—
`1.10`	affected	—
`1.11`	affected	—
`1.12`	affected	—
`1.13`	affected	—
`1.14`	affected	—
`1.15`	affected	—
`1.16`	affected	—
`1.17`	affected	—
`1.18`	affected	—
`1.19`	affected	—
`1.20`	affected	—
`1.21`	affected	—
`1.22`	affected	—
`1.23`	affected	—
`1.24`	affected	—
`1.25`	affected	—
`1.26`	affected	—
`1.27`	affected	—
`1.28`	affected	—
`1.29`	affected	—
`1.30`	affected	—
`1.31`	affected	—
`1.32`	affected	—
`1.33`	affected	—
`1.34`	affected	—
`1.35`	affected	—
`1.36`	affected	—
`1.37`	affected	—
`1.38`	affected	—
`1.39`	affected	—
`1.40`	affected	—
`1.41`	affected	—
`1.42`	affected	—
`1.43`	affected	—
`1.44`	affected	—
`1.45`	affected	—
`1.46`	affected	—
`1.47`	affected	—
`1.48`	affected	—
`1.49`	affected	—
`1.50`	affected	—
`1.51`	affected	—
`1.52`	affected	—
`1.53`	affected	—
`1.54`	affected	—
`1.55`	affected	—
`1.56`	affected	—
`1.57`	affected	—
`1.58`	affected	—
`1.59`	affected	—
`1.60`	affected	—
`1.61`	affected	—
`1.62`	affected	—
`1.63`	affected	—
`1.64`	affected	—
`1.65`	affected	—
`1.66`	affected	—
`1.67`	affected	—
`1.68`	affected	—
`1.69`	affected	—
`1.70`	affected	—
`1.71`	affected	—
`1.72`	affected	—
`1.73`	affected	—
`1.74`	affected	—
`1.75`	affected	—
`1.76`	affected	—
`1.77`	affected	—
`1.78`	affected	—
`1.79`	affected	—
`1.80`	affected	—
`1.81`	affected	—
`1.82`	affected	—
`1.83`	affected	—
`1.84`	affected	—
`1.85`	affected	—
`1.86`	affected	—
`1.87`	affected	—
`1.88`	affected	—
`1.89`	affected	—
`1.90`	affected	—
`1.91`	affected	—
`1.92`	affected	—
`1.93`	affected	—
`1.94`	affected	—

No data.

Vendor Product Versions

Ritlabs

Tinyweb Server

Version	Status	Scheme	Platform
`[1.0,1.94]`	affected	generic	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.324% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://nathan2.com/posts/tinyweb/
https://vuldb.com/cve/CVE-2026-12200
https://vuldb.com/submit/829894
https://vuldb.com/vuln/370842
https://vuldb.com/vuln/370842/cti

History

Jun 15, 2026 10:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jun 15, 2026 12:45 AM Description updated. Title updated. First appearance in the feed. Weaknesses updated. Affected versions updated. Affected vendors updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		A security vulnerability has been detected in Ritlabs TinyWeb Server up to 1.94 on Win32. This impacts an unknown function in the library libeay32.dll.html of the component Header Handler. The manipulation of the argument Authorization leads to stack-based buffer overflow. The attack can be initiated remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Title		Ritlabs TinyWeb Server Header libeay32.dll.html stack-based overflow
First Time appeared		Ritlabs Ritlabs tinyweb Server
Weaknesses		CWE-119 CWE-121
CPEs		cpe:2.3:a:ritlabs:tinyweb_server::::::::
Vendors & Products		Ritlabs Ritlabs tinyweb Server
References		https://nathan2.com/posts/tinyweb/ https://vuldb.com/cve/CVE-2026-12200 https://vuldb.com/submit/829894 https://vuldb.com/vuln/370842 https://vuldb.com/vuln/370842/cti
Metrics		cvssV2_0 `{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:UR'}` cvssV3_0 `{'score': 7.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}` cvssV3_1 `{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R'}` cvssV4_0 `{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}`

Subscriptions

Ritlabs Tinyweb Server

Weaknesses

Sources

CVE record Updated: Jun 15, 2026, 9:50 PM

Status: PUBLISHED
Assigner: VulDB
Published: Jun 15, 2026, 12:15 AM
Updated: Jun 15, 2026, 9:50 PM
Reserved: Jun 14, 2026, 11:39 AM

View source JSON

Vulnrichment Updated: Jun 15, 2026, 9:50 PM

Updated: Jun 15, 2026, 9:50 PM

JSON

NVD Updated: Jul 24, 2026, 12:10 PM

Status: Deferred
Published: Jun 15, 2026, 1:16 AM
Modified: Jul 24, 2026, 12:10 PM

View source JSON

Red Hat No data

No data.

OpenCVE enrichment Updated: Jun 15, 2026, 5:30 AM

Updated: Jun 15, 2026, 5:30 AM

JSON

Affected Products

Remediation

Tracking

Advisories

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

Exploitation none

Automatable yes

Technical Impact partial

Subscriptions

Sources

JSON object

JSON object

JSON object

JSON object

JSON object