GHSA-G753-JX37-7XWH

Workarounds

There is no workarounds in jsrsasign. Update jsrsasign or use other ECDSA library.

ACKNOWLEDGEMENT

Thanks to Jan Jancar @J08nY, Petr Svenda and Vladimir Sedlacek of Masaryk University in Czech Republic to find and report this vulnerability.

References

https://minerva.crocs.fi.muni.cz/
https://www.npmjs.com/advisories/1505
https://github.com/kjur/jsrsasign/issues/411

ECDSA side-channel attack named Minerava have been found and it was found that it affects to jsrsasign.

Execution time of thousands signature generation have been observed then EC private key which is scalar value may be recovered since point and scalar multiplication time depends on bits of scalar. In jsrsasign 8.0.13 or later, execution time of EC point and scalar multiplication is almost constant and fixed for the issue.

• Minerva is one of timing attack or side channel attack for EC.
• If you don't use ECDSA class, you are not affected the vulnerability.
• The vulnerability is that attacker may guess private key by checking processing time of EC key generation or ECDSA signing.
• The cause issue is that point multiplication processing time in ECDSA signing is depends on private key value.
• After 8.0.13, processing time of point multiplication in ECDSA signing have become constant for key value in theory.

Multiple concurrent operations access a shared resource without proper synchronization, producing unpredictable results depending on timing. Typical impact: TOCTOU exploits, data corruption, or privilege escalation.

GHSA-G753-JX37-7XWH has a CVSS score of 5.9 (Medium). The vector is reachable from an adjacent network, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (8.0.13); upgrading removes the vulnerable code path.

Kodem intelligence

Users using ECDSA signature generation should upgrade to 8.0.13 or later.

1. What is GHSA-G753-JX37-7XWH? GHSA-G753-JX37-7XWH is a medium-severity race condition vulnerability in jsrsasign (npm), affecting versions >= 4.0.0, < 8.0.13. It is fixed in 8.0.13. Multiple concurrent operations access a shared resource without proper synchronization, producing unpredictable results depending on timing.
2. How severe is GHSA-G753-JX37-7XWH? GHSA-G753-JX37-7XWH has a CVSS score of 5.9 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of jsrsasign are affected by GHSA-G753-JX37-7XWH? jsrsasign (npm) versions >= 4.0.0, < 8.0.13 is affected.
4. Is there a fix for GHSA-G753-JX37-7XWH? Yes. GHSA-G753-JX37-7XWH is fixed in 8.0.13. Upgrade to this version or later.
5. Is GHSA-G753-JX37-7XWH exploitable, and should I be worried? Whether GHSA-G753-JX37-7XWH is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether GHSA-G753-JX37-7XWH is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix GHSA-G753-JX37-7XWH? Upgrade jsrsasign to 8.0.13 or later.