CVE-2020-1026
highpriority · track · 40EPSS 0.026 · 85 %ileEURUUSEPSS · scored 2026-10-27
A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the library’s Elliptic Curve Cryptography (ECC) implementation.An attacker could potentially abuse these bugs to learn information about a server’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'.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (4)
Products and version ranges known to be affected.
- microsoft research javascript cryptography library= 1.4nvdUScpe:2.3:a:microsoft:research_javascript_cryptography_library:*:*:*:*:*:*:*:*
advisories (1)
Vendor and ecosystem advisories describing this.
- GHSA-9x9j-836w-8f55Incorrect Calculation in the MSR JavaScript Cryptography Library2022-01-06ghsa · osvUS
A Security Feature Bypass vulnerability exists in the MSR JavaScript Cryptography Library that is caused by multiple bugs in the library's Elliptic Curve Cryptography (ECC) implementation.An attacker could potentially abuse these bugs to learn information about a server'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`.
also known as (4)
Other names and identifiers for this entity.
sources
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references (5)
External citations — patches, advisories, analysis.
- https://nvd.nist.gov/vuln/detail/CVE-2020-1026cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026cnnvd
- https://portal.msrc.microsoft.com/zh-CN/security-guidance/advisory/CVE-2020-1026cnnvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026enisa_euvd
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1026PatchVendor Advisorynvd
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