CVE-2019-7167

HighCVSS 7.5/10Last modified Jun 17, 2026

Description

Zcash, before the Sapling network upgrade (2018-10-28), had a counterfeiting vulnerability. A key-generation process, during evaluation of polynomials related to a to-be-proven statement, produced certain bypass elements. Availability of these elements allowed a cheating prover to bypass a consistency check, and consequently transform the proof of one statement into an ostensibly valid proof of a different statement, thereby breaking the soundness of the proof system. This misled the original Sprout zk-SNARK verifier into accepting the correctness of a transaction.

Metrics

CVSS 3.0 7.5/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-754

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/Press/Media Coverage, Third Party Advisory
https://github.com/JinBean/CVE-Extension
https://z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/Vendor Advisory
http://fortune.com/2019/02/05/zcash-vulnerability-cryptocurrency/Press/Media Coverage, Third Party Advisory
https://github.com/JinBean/CVE-Extension
https://z.cash/blog/zcash-counterfeiting-vulnerability-successfully-remediated/Vendor Advisory

Timeline

Published: Mar 27, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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