Insufficient verification of data authenticity in scapy - #VU148432
Published: September 9, 2026
Vulnerability identifier: #VU148432
CSH Severity: Low
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to impersonate a victim to another service and issue authenticated requests.
The vulnerability exists due to insufficient verification of data authenticity in the SPNEGOSSP authentication negotiation handling when processing a bare authentication token after SPNEGO mechanism negotiation has begun. A remote attacker can relay challenge-response messages and switch the authentication method from Kerberos to NTLM to impersonate a victim to another service and issue authenticated requests.
The attack requires inducing the victim's HTTP authentication and relaying several challenge-response messages.
Affected software
scapy
Remediation
Install security update from vendor's website.
scapy - update to 2.8.0