The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or…
Priority MEDIUM 45CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-347.
Summary
The verify function in the Stark Bank Python ECDSA library (aka starkbank-escada or ecdsa-python) before 2.0.1 fails to check that the signature is non-zero, which allows attackers to forge signatures on arbitrary messages.
Why it matters now
EPSS 0.01248 69th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed starkbank-ecdsa (PyPI): 2.0.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | starkbank-ecdsa (PyPI) | before 2.0.1 | 2.0.1 | Patch available | GHSA-92vm-mxjf-jqf3 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- starkbank-ecdsa (PyPI) Vendor— Affected before 2.0.1 Fixed in 2.0.1 Patch available GHSA-92vm-mxjf-jqf3
Remediation
- Fix · GHSA-92vm-mxjf-jqf3 starkbank-ecdsa (PyPI) Fixed in 2.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2021-43572
- 2026-10-03 Alias added: GHSA-92vm-mxjf-jqf3
References
Advisory 2
Sources
- CVE-2021-43572 · CVE Program
- CVE-2021-43572 · NVD
- FIRST EPSS
- GHSA-92vm-mxjf-jqf3 · GitHub Advisory Database · CC BY 4.0
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