Information Exposure Affecting nextcloud-server-32 package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-NEXTCLOUDSERVER32-20509869
- published5 Oct 2026
- disclosed1 Sept 2026
Introduced: 1 Sep 2026
CVE-2026-84308 (opens in a new tab)How to fix?
There is no fixed version for Minimos:latest nextcloud-server-32.
NVD Description
Note: Versions mentioned in the description apply only to the upstream nextcloud-server-32 package and not the nextcloud-server-32 package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
phpseclib is a PHP secure communications library. Prior to 3.0.57 and 4.0.1, pure-PHP X25519 scalar multiplication in phpseclib/Math/PrimeField/Integer.php performs data-dependent conditional modular reductions in add() and subtract(). During the Montgomery ladder in phpseclib/Crypt/EC/BaseCurves/Montgomery.php, the reduction behavior of each step depends on the secret scalar prefix, creating per-step timing and libgmp call-count observations that can reveal a reused 251-bit clamped private scalar. The phpseclib/Crypt/EC/Formats/Keys/MontgomeryPrivate.php derivation path invokes the pure-PHP multiplication without a native-engine check, while phpseclib/Crypt/EC/Formats/Keys/PKCS8.php reaches it when ext-sodium is unavailable. Exploitation requires a reused or long-lived X25519 private key, knowledge of the corresponding public key, execution of the pure-PHP path, and a local observer capable of resolving individual ladder steps or libgmp entry-point calls. Ephemeral X25519 keys, including phpseclib's normal SSH exchange path, are not affected. Recovery of the scalar permanently compromises operations that reuse that key. This issue is fixed in versions 3.0.57 and 4.0.1.
References
- https://www.cve.org/CVERecord?id=CVE-2026-84308
- https://github.com/advisories/GHSA-q97c-8qh3-fpc6
- https://osv.dev/vulnerability/MINI-c848-5gw4-2v8w
- https://osv.dev/vulnerability/CVE-2026-84308
- https://github.com/phpseclib/phpseclib/commit/fb56bc5bb9009b54a6c26b31aeec8ed944f17373
- https://github.com/phpseclib/phpseclib/releases/tag/3.0.57
- https://github.com/phpseclib/phpseclib/releases/tag/4.0.1
- https://github.com/phpseclib/phpseclib/security/advisories/GHSA-q97c-8qh3-fpc6