Is phpseclib/phpseclib 4.0 vulnerable?

Composer · 4 releases from 4.0.0 to 4.0.3 · latest phpseclib/phpseclib is 4.0.3 · checked 2 Nov 2026

No known advisories in the last release

phpseclib/phpseclib 4.0.3, the last 4.0 release, has no known advisories. 1 advisory affects earlier 4.0.x releases, so update to 4.0.3.

Update within 4.0:composer require phpseclib/phpseclib:^4.0.3

Is your project affected?

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Fixed within 4.0.x, affecting earlier releases

  • MediumCVE-2026-84308GHSA-q97c-8qh3-fpc68 Sept 2026

    phpseclib — non-constant-time X25519 scalar multiplication permits full private-key recovery

    Affected
    <3.0.57 · >=4.0.0 <4.0.1
    Fixed in
    3.0.57, 4.0.1

Which of your client projects are still on phpseclib/phpseclib 4.0?

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Other phpseclib/phpseclib versions

Advisory data from OSV.dev (opens OSV.dev in a new tab), which includes the GitHub Advisory Database. Release list from the Composer registry. Refreshed daily.