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

Source: https://junglewise.ai/threats/cve-2024-27354-phpseclib-guardrails-needed-on-isprime-and-randomprime  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-06  
License: CC BY 4.0 with a link back

CVE-2024-27354 · Severity: low · CVSS 3.1 · Published 2026-05-06

phpseclib: guardrails needed on isPrime and randomPrime

Technologies: [phpseclib/phpseclib (Packagist)](https://junglewise.ai/threats/technologies/phpseclib-phpseclib). Vendors: [Packagist](https://junglewise.ai/threats/vendors/packagist).

## Quick answers

**Is CVE-2024-27354 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-27354 being exploited in the wild.

**How severe is CVE-2024-27354?** Low severity, with a CVSS score of 3.1, published 6 May 2026.

**Which products and versions are affected?** phpseclib/phpseclib (Packagist) ECOSYSTEM:introduced=0.1.1,fixed=1.0.23.

**Is there a fix for CVE-2024-27354?** Yes. phpseclib/phpseclib (Packagist): upgrade to 1.0.23 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2024-27354?** Check whether you run phpseclib/phpseclib (Packagist) 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

- phpseclib/phpseclib (Packagist): upgrade to 1.0.23 or later

  ```sh
  composer require phpseclib/phpseclib:^1.0.23
  ```


## Affected products

- phpseclib/phpseclib (Packagist) ECOSYSTEM:introduced=0.1.1,fixed=1.0.23

## Identifiers

- CVE-2024-27354
- GHSA-2528-jw5q-ww88

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- [Phpseclib needs guardrails on large binaryfield integers](https://junglewise.ai/threats/cve-2023-49316-phpseclib-needs-guardrails-on-large-binaryfield-integers)
- [phpseclib guardrails needed on OID length](https://junglewise.ai/threats/cve-2024-27355-phpseclib-guardrails-needed-on-oid-length)