CVE-2026-128238
Scapy before 2.8.0 Uncontrolled Recursion DoS via BER SEQUENCE Decoder
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
Scapy before 2.8.0 contains an uncontrolled recursion vulnerability in the BER/ASN.1 decoder in scapy/asn1/ber.py that allows unauthenticated remote attackers to crash parsing applications. Attackers can send a single 833-byte packet with 250 nested ASN.1 SEQUENCE structures to trigger an unhandled RecursionError, terminating TLS, SNMP, X.509, or LDAP parsers even with safe=True.
| CWE | CWE-674 |
| Vendor | secdev |
| Product | scapy |
| Published | Nov 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
secdev / scapy
0 < 2.8.0
References
Credits
infycore