An issue was discovered in the jsrsasign package through 8.0.18 for Node.js.
Priority LOW 35CWE-347Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-347.
Summary
An issue was discovered in the jsrsasign package through 8.0.18 for Node.js. It allows a malleability in ECDSA signatures by not checking overflows in the length of a sequence and '0' characters appended or prepended to an integer. The modified signatures are verified as valid. This could have a security-relevant impact if an application relied on a single canonical signature.
Why it matters now
EPSS 0.01153 67th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed jsrsasign (npm): 8.0.19
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 |
| — | jsrsasign (npm) | 4.0.0 to before 8.0.19 | 8.0.19 | Patch available | GHSA-p8c3-7rj8-q963 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- jsrsasign (npm) Vendor— Affected 4.0.0 to before 8.0.19 Fixed in 8.0.19 Patch available GHSA-p8c3-7rj8-q963
Remediation
- Fix · GHSA-p8c3-7rj8-q963 jsrsasign (npm) Fixed in 8.0.19 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-14966
- 2026-10-03 Alias added: GHSA-p8c3-7rj8-q963
References
Advisory 6
Other 8
- https://github.com/kjur/jsrsasign/security/advisories/GHSA-p8c3-7rj8-q963
- https://github.com/kjur/jsrsasign/commit/6087412d072a57074d3c4c1b40bdde0460d53a7f
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-14966
- https://github.com/kjur/jsrsasign
- https://kjur.github.io/jsrsasign
- https://kjur.github.io/jsrsasign/api/symbols/ASN1HEX.html#.checkStrictDER
- https://kjur.github.io/jsrsasign/api/symbols/KJUR.crypto.ECDSA.html
- https://security.netapp.com/advisory/ntap-20200724-0001
Sources
- CVE-2020-14966 · CVE Program
- CVE-2020-14966 · NVD
- FIRST EPSS
- GHSA-p8c3-7rj8-q963 · GitHub Advisory Database · CC BY 4.0
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