Bug 2572983 (CVE-2026-128237)

Summary: CVE-2026-128237 scapy: scapy: Denial of Service via oversized ASN.1 OID decoding
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Scapy. A remote attacker can cause a Denial of Service (DoS) by sending specially crafted network traffic containing oversized Object Identifier (OID) sequences encoded with Basic Encoding Rules (BER). Processing these excessively long values leads to disproportionate CPU consumption or an unhandled exception, causing the application to hang or crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-13 09:42:25 UTC
Scapy before 2.8.0 contains a denial of service vulnerability in BER_num_dec() and BERcodec_OID.do_dec() that allows remote attackers to exhaust CPU by supplying oversized OID arcs. Attackers can send ASN.1/BER data with many base-128 continuation bytes to cause quadratic CPU consumption or an uncaught ValueError crash on Python 3.11+.