CVE-2026-27633Network attack vector

Service crash via unbounded request-body allocation

Published Feb 25, 2026 · Updated Feb 25, 2026

Memory exhaustion in TinyWeb 2.01 and earlier allows remote attackers to crash the server via an oversized HTTP POST body. In SrvMain.pas, TCollector.Collect appends socket chunks to EntityBody with SetLength() without bounding Content-Length or accumulated body size. No authentication or user interaction is required; sustained body data consumes available process memory until the Win32 server crashes.

CVSS severity8.7
High
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory exhaustion in TinyWeb 2.01 and earlier allows remote attackers to crash the server via an oversized HTTP POST body. In SrvMain.pas, TCollector.Collect appends socket chunks to EntityBody with SetLength() without bounding Content-Length or accumulated body size. No authentication or user interaction is required; sustained body data consumes available process memory until the Win32 server crashes.

The record

CVE
CVE-2026-27633
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
Maxim Masiutin
Product
TinyWeb
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Maxim Masiutin · TinyWebversion=< 2.02

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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