CVE-2026-103415: critical vulnerability in Eclipse Foundation NetX Duo
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.3epss 0.3%
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.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Eclipse Foundation · NetX DuoRelated CVEs — Eclipse Foundation NetX Duo
In the same product, most dangerous first.
CVE-2025-55085HIGHWeb http client: Unchecked Server-Side Malicious Packet IssueEPSS 0.6%CVE-2025-55094MEDIUMPotential out-of-bounds read in _nx_icmpv6_validate_options()EPSS 0.4%CVE-2025-55091MEDIUMPotential out of bound read in _nx_ip_packet_receive()EPSS 0.4%CVE-2025-55090MEDIUMPotential out of bound read issue in _nx_ipv4_packet_receive() in NetX DuoEPSS 0.4%CVE-2025-55081MEDIUMPotential out of bound read in _nx_secure_tls_process_clienthello()EPSS 0.4%CVE-2025-55092MEDIUMPotential out of bound read in _nx_ipv4_option_process()EPSS 0.3%