CVE-2024-27354: phpseclib: guardrails needed on isPrime and randomPrime

high Affects phpseclib/phpseclib. Feed 2026.10.29.3, updated 2026-10-29; published 2026-05-06.

phpseclib: guardrails needed on isPrime and randomPrime

Package: phpseclib/phpseclib Composer
Affected versions: >=0.1.1 and <1.0.23 or >=2.0.0 and <2.0.47 or >=3.0.0 and <3.0.36 or >=1.0.0 and <1.0.23
Fixed in: 1.0.23, 2.0.47, 3.0.36
Severity: high CVSS 7.5
Exploitation: not on CISA KEV · EPSS 1% (48.7th percentile)
Published: 2026-05-06
Source: osv.dev

References

NVD record phpseclib/phpseclib advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

# or, without Composer
pipx install phpwarden   &&   phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs How findings are ranked

Related advisories

CVE-2021-30130 high Improper Certificate Validation in phpseclib same package: phpseclib/phpseclib
CVE-2023-27560 high phpseclib Infinite Loop vulnerability same package: phpseclib/phpseclib
CVE-2023-49316 high Phpseclib needs guardrails on large binaryfield integers same package: phpseclib/phpseclib
CVE-2024-27355 high phpseclib guardrails needed on OID length same package: phpseclib/phpseclib
CVE-2026-32935 high phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack same package: phpseclib/phpseclib
CVE-2023-52892 high Name confusion in x509 Subject Alternative Name fields same package: phpseclib/phpseclib