CVE-2026-4742Network attack vector

Request smuggling via retained chunked-transfer parser state

Published Mar 24, 2026 · Updated Mar 24, 2026

HTTP request smuggling in LiteIDE before x38.4 allows remote attackers to desynchronize HTTP message boundaries with crafted headers. The vendored http_parser_execute() retains its chunked flag when a later duplicate Transfer-Encoding header means chunked is no longer the final coding. Exploitation requires network access to the qjsonrpc HTTP endpoint and a peer that interprets the duplicate headers differently, enabling injected downstream requests.

CVSS severityUnavailable
Unscored
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTTP request smuggling in LiteIDE before x38.4 allows remote attackers to desynchronize HTTP message boundaries with crafted headers. The vendored http_parser_execute() retains its chunked flag when a later duplicate Transfer-Encoding header means chunked is no longer the final coding. Exploitation requires network access to the qjsonrpc HTTP endpoint and a peer that interprets the duplicate headers differently, enabling injected downstream requests.

The record

CVE
CVE-2026-4742
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
visualfc
Product
LiteIDE
Classifications
CWE-444
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 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=0 <x38.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

visualfc · LiteIDEversion=0 <x38.4

Published CVSS scores

2.9Government Technology Agency of Singapore Cyber Security Group (GovTech CSG)CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:N/E:P

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 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-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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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