CVE-2019-11636
Zcash 2.x allows an inexpensive approach to "fill all transactions of all blocks" and "prevent any real transaction from occurring" via a "Sapling Wood-Chipper" attack.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.18%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Zcash 2.x allows an inexpensive approach to "fill all transactions of all blocks" and "prevent any real transaction from occurring" via a "Sapling Wood-Chipper" attack.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.18% probability · 82th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-254
- Affected
- z.cash/zcash
- Source
- cve@mitre.org
EPSS 2.2% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/zcash/zcash/issues/3955Third Party Advisory
- https://saplingwoodchipper.github.io
- https://twitter.com/dukeleto/status/1120467430118232066Third Party Advisory
- https://github.com/zcash/zcash/issues/3955Third Party Advisory
- https://saplingwoodchipper.github.io
- https://twitter.com/dukeleto/status/1120467430118232066Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.