TI-2020-00995 Aliases CVE-2020-1026 GHSA-9x9j-836w-8f55

Information disclosure in Microsoft Research JavaScript Cryptography Library V1.4

MEDIUM 47CWE-200Published 2020-04-15 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure, 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-200 and CWE-347.

Summary

A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the libraryâ€™s Elliptic Curve Cryptography (ECC) implementation.An attacker could potentially abuse these bugs to learn information about a serverâ€™s private ECC key (a key leakage attack) or craft an invalid ECDSA signature that nevertheless passes as valid.The security update addresses the vulnerability by fixing the bugs disclosed in the ECC implementation, aka 'MSR JavaScript Cryptography Library Security Feature Bypass Vulnerability'.

Why it matters now

EPSS 0.02605 85th percentileScored 2026-11-07

Fix Fixed msrcrypto (npm): 1.5.8

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
Microsoft	Microsoft Research JavaScript Cryptography Library V1.4	all versions	—	No fix listed	CNA
—	msrcrypto (npm)	before 1.5.8	1.5.8	Patch available	GHSA-9x9j-836w-8f55

Microsoft Research JavaScript Cryptography Library V1.4 VendorMicrosoft Affected all versions Fixed in — No fix listed CNA
msrcrypto (npm) Vendor— Affected before 1.5.8 Fixed in 1.5.8 Patch available GHSA-9x9j-836w-8f55

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:microsoft:research_javascript_cryptography_library:1.4:::::::*	1.4	Vulnerable	Microsoft

cpe:2.3:a:microsoft:research_javascript_cryptography_library:1.4:*:*:*:*:*:*:* Versions 1.4 Vulnerable ·Microsoft

Remediation

Fix · GHSA-9x9j-836w-8f55 msrcrypto (npm) Fixed in 1.5.8 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2020-1026
2026-10-03 Alias added: GHSA-9x9j-836w-8f55

References

Patch 1

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2020-1026

TI-2018-06018 A Security Feature Bypass vulnerability exists in MSR JavaScript Cryptography Library… CVSS 3.0CRITICAL 9.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences