CVE-2026-28497Public exploitNetwork attack vector

Unauthenticated request smuggling via Content-Length overflow

Published Mar 6, 2026 · Updated Mar 6, 2026

Integer overflow in GeneralSandman TinyWeb before 2.03 allows remote attackers to smuggle requests via oversized Content-Length values. The _Val routine in SRC/xBase.pas accumulates Content-Length digits in a signed 32-bit integer without checking overflow, so TinyWeb reads a wrapped body length and parses buffered bytes as another request. Exploitation requires no authentication or user interaction, while request desynchronization requires a persistent connection and can bypass frontend filtering, poison cached responses, or expose another user's request data.

CVSS severity9.3
Critical
EPSS probability0.47%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in GeneralSandman TinyWeb before 2.03 allows remote attackers to smuggle requests via oversized Content-Length values. The _Val routine in SRC/xBase.pas accumulates Content-Length digits in a signed 32-bit integer without checking overflow, so TinyWeb reads a wrapped body length and parses buffered bytes as another request. Exploitation requires no authentication or user interaction, while request desynchronization requires a persistent connection and can bypass frontend filtering, poison cached responses, or expose another user's request data.

The record

CVE
CVE-2026-28497
Published
Mar 6, 2026
Updated
Mar 6, 2026
Vendor
GeneralSandman
Product
TinyWeb
Classifications
CWE-444, CWE-190, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 6, 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=< 2.03

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

GeneralSandman · TinyWebversion=< 2.03

Published CVSS scores

9.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
9.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
CWE-190Integer Overflow or Wraparound
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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