CVE-2026-128238

Name	CVE-2026-128238
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
scapy (PTS)	bookworm	2.5.0+dfsg-2	vulnerable
	trixie	2.6.1+dfsg-1	vulnerable
	forky, sid	2.8.0+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
scapy	source	(unstable)	2.8.0+dfsg-1

https://github.com/secdev/scapy/security/advisories/GHSA-456h-w4v7-hvpr