Quick answers
- Is CVE-2026-65631 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-65631 being exploited in the wild.
- How severe is CVE-2026-65631?
- Informational severity, published 26 October 2026.
- Which products and versions are affected?
- Erlang Jose 1.7.7 before 1.11.13.
- Is there a fix for CVE-2026-65631?
- Yes: fixed in jose 1.11.13. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-65631 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-65631?
- Check whether you run Erlang Jose at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: jose 1.11.13
Technical details
The vulnerability exists in the convert_sfm_to_crt/1 function, which attempts to recover Chinese Remainder Theorem parameters (p, q, dp, dq, qi) from an RSA key by factoring the modulus when those parameters are missing. If an attacker supplies an RSA key where the modulus cannot be factored (e.g., a prime number), the search loop performs expensive modular exponentiation operations repeatedly until an internal watchdog terminates the worker after one second. By flooding requests with large prime moduli, an attacker can saturate all CPU schedulers and cause denial of service without authentication or a valid RSA key.
Affected products
- erlang jose 1.7.7 before 1.11.13
Timeline
- 2026-10-26: disclosed