CVE-2026-4602 affects versions of the jsrsasign package prior to 11.1.1, stemming from an incorrect numeric type conversion vulnerability (CWE-681) in its ext/jsbn2.js component that mishandles negative exponents. This flaw allows an attacker to force incorrect modular inverse computations, thereby compromising cryptographic signature verification. Rated High severity with a CVSS score of 7.5 (AV:N/AC:L/A:H), this remotely exploitable vulnerability can lead to a high impact on availability by undermining the integrity of signature processes. There is currently no evidence of active exploitation, public exploit code, or significant community attention, as indicated by its absence from the KEV catalog, exploit databases, and a very low EPSS score.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 11.1.1CPE matchmatch criteria | cpe:2.3:a:kjur:jsrsasign:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.