TI-2026-74356 Aliases CVE-2026-103415

Out-of-bounds write in Eclipse NetX Duo TLS client

MEDIUM 48CWE-787Published 2026-10-14 · Updated 2026-10-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.

Summary

NetX Duo from 0 through 6.5.1.202602 from Eclipse Foundation contains an out-of-bounds write (CWE-787) in the TLS 1.3 client. When the client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without checking that the cookie fits in the outgoing packet. A malicious or compromised server can overwrite memory past the caller supplied TLS packet buffer without presenting a certificate, because the write happens before certificate authentication completes. Only the client path is affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

When a TLS 1.3 client processes a HelloRetryRequest, it copies the server's cookie into its second ClientHello without checking that the cookie fits in the outgoing packet. Both the length and the contents of that cookie come from the peer, and the write happens before certificate authentication completes, so a malicious or compromised server can overwrite memory past the caller supplied TLS packet buffer without presenting a certificate. Only the client path is affected.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00284 21st percentileScored 2026-11-07

Fix Fixed NetX Duo (Eclipse Foundation): 6.5.2.202603

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Eclipse Foundation	NetX Duo	up to 6.5.1.202602	6.5.2.202603	Patch available	CNA

NetX Duo VendorEclipse Foundation Affected up to 6.5.1.202602 Fixed in 6.5.2.202603 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:eclipse:threadx_netx_duo::::::::	—	—	Eclipse Foundation

cpe:2.3:a:eclipse:threadx_netx_duo:*:*:*:*:*:*:*:* Versions — — ·Eclipse Foundation

Remediation

Update NetX Duo to version 6.5.2.202603.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Fix · CNA NetX Duo (Eclipse Foundation) Fixed in 6.5.2.202603

Timeline

2026-10-15 Threatist record created from CVE-2026-103415
2026-10-18 CISA SSVC decision points changed

References

Other 2

TI-2023-23979 The HTTP/2 protocol allows a denial of service (server resource consumption) because… KEVCVSS 3.1HIGH 7.5
TI-2026-81947 Unauthenticated command injection in Eclipse Che che-machine-exec CVSS 3.1CRITICAL 9.8
TI-2026-13216 CWE-863: ABAC authorization bypass via trailing slash route normalization in Eclipse BaSyx Go Components CVSS 3.1CRITICAL 9.8
TI-2026-06514 Path traversal in Eclipse BaSyx CVSS 3.1CRITICAL 10.0
TI-2026-01382 In the Eclipse Theia Website repository, the GitHub Actions workflow… CVSS 3.1CRITICAL 10.0
TI-2026-74697 Authentication bypass in Eclipse Jetty EthereumAuthenticator CVSS 4.0CRITICAL 9.3

See all 466 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences