CVE-2026-128237

CVSS 6.9 (medium) · published 2026-11-13

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+.

Weakness: CWE-407

Source: NVD CVE-2026-128237

References

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

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