CVE-2026-128237

MEDIUM 5.3

Scapy before 2.8.0 Denial of Service via Quadratic BER OID Decoding

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

0th

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+.

CWE	CWE-407
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

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/secdev/scapy/security/advisories/GHSA-xx44-g48m-mjp6 vulncheck.com: https://www.vulncheck.com/advisories/scapy-before-2.8.0-denial-of-service-via-quadratic-ber-oid-decoding

Credits

tynus2