CVE-2024-27354: phpseclib Guardrails Needed On IsPrime And Vulnerability

HIGH
Advisory Identifier: GHSA-2528-jw5q-ww88
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2024-27354 is a HIGH (CVSS 7.5) guardrails needed on isprime and vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting phpseclib libraries in the Packagist ecosystem. The issue involves guardrails needed on isprime and randomprime. Remediation is available by upgrading affected packages to version 1.0.23, 2.0.47, 3.0.36.

CVE-2024-27354 at a Glance

CVE Identifier CVE-2024-27354
GHSA Identifier GHSA-2528-jw5q-ww88
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product phpseclib
Package Ecosystem Packagist
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2024-27354

To remediate this vulnerability, upgrade all affected phpseclib dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

phpseclib/phpseclib fixed: 1.0.23 
Upgrade phpseclib/phpseclib to 1.0.23
phpseclib/phpseclib fixed: 2.0.47 
Upgrade phpseclib/phpseclib to 2.0.47
phpseclib/phpseclib fixed: 3.0.36 
Upgrade phpseclib/phpseclib to 3.0.36
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for phpseclib/phpseclib

How to Check if You Are Affected

To determine whether your application is affected by CVE-2024-27354, inspect your project dependencies for phpseclib:

inspect dependencies for phpseclib/phpseclib

Analyze the terminal output to locate any version of phpseclib in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.0.23), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In phpseclib, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact Anyone trying to generate a prime and testing the primality of a number. ### Patches https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575 ### Workarounds Using the GMP extension would probably help, assuming that one has its own guardrails. ### Resources https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575 https://www.usenix.org/system/files/conference/usenixsecurity25/sec25cycle1-prepub-599-shi-bing.pdf

CVE-2024-27354 Affected phpseclib Versions

3 component(s)
Fixed Versions:
1.0.232.0.473.0.36
Product / Package Ecosystem Affected Versions Fixed Version
phpseclib/phpseclib
 Packagist
≥ 0.1.1
< 1.0.23
1.0.23
phpseclib/phpseclib
 Packagist
≥ 2.0.0
< 2.0.47
2.0.47
phpseclib/phpseclib
 Packagist
≥ 3.0.0
< 3.0.36
3.0.36

References

GitHub Advisory / Wiki ADVISORY
https://github.com/phpseclib/phpseclib/security/advisories/GHSA-2528-jw5q-ww88
NVD — CVE-2024-27354 NVD
https://nvd.nist.gov/vuln/detail/CVE-2024-27354
Security Fix Commit FIX COMMIT
https://github.com/phpseclib/phpseclib/commit/2870c8fab3f132d2ed40a66c97a36fe5ab625698
Security Fix Commit FIX COMMIT
https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575
Security Fix Commit FIX COMMIT
https://github.com/phpseclib/phpseclib/commit/c55b75199ec8d12cec6eadf6da99da4a3712fe56
phpseclib Source Repository REPOSITORY
https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b
phpseclib Source Repository REPOSITORY
https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2024-27354.yaml
phpseclib Source Repository REPOSITORY
https://github.com/phpseclib/phpseclib
phpseclib Source Repository REPOSITORY
https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html

Frequently Asked Questions

What is CVE-2024-27354?
CVE-2024-27354 is a security vulnerability in phpseclib involving guardrails needed on isPrime and randomPrime under CWE-400: Uncontrolled Resource Consumption.
Which phpseclib versions are affected?
Affected versions include releases prior to 1.0.23, 2.0.47, 3.0.36 across affected packages: phpseclib/phpseclib.
What version fixes CVE-2024-27354?
Upgrading to 1.0.23, 2.0.47, 3.0.36 (or the latest patched release for your respective branch) resolves the vulnerability.
Is phpseclib/phpseclib affected?
Yes, phpseclib/phpseclib is affected in releases prior to 1.0.23, 2.0.47, 3.0.36. Upgrade your dependency to 1.0.23, 2.0.47, 3.0.36 or later.
What is the CVSS score of CVE-2024-27354?
CVE-2024-27354 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2024-27354?
CVE-2024-27354 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Packagist dependencies for CVE-2024-27354?
Run the dependency tree command: 'inspect dependencies for phpseclib/phpseclib'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
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  "id" : "GHSA-2528-jw5q-ww88",
  "modified" : "2026-05-06T17:57:10Z",
  "published" : "2026-05-06T17:57:10Z",
  "aliases" : [ "CVE-2024-27354" ],
  "summary" : "phpseclib: guardrails needed on isPrime and randomPrime",
  "details" : "### Impact\nAnyone trying to generate a prime and testing the primality of a number.\n\n### Patches\nhttps://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575\n\n### Workarounds\nUsing the GMP extension would probably help, assuming that one has its own guardrails.\n\n### Resources\nhttps://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575\nhttps://www.usenix.org/system/files/conference/usenixsecurity25/sec25cycle1-prepub-599-shi-bing.pdf",
  "severity" : [ {
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    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
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  "references" : [ {
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  }, {
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    "url" : "https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575"
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    "type" : "WEB",
    "url" : "https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b"
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    "url" : "https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2024-27354.yaml"
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  }, {
    "type" : "WEB",
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  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-05-06T17:57:10Z",
    "nvd_published_at" : null
  }
}