Vulnerability-Lookup

GHSA-2528-JW5Q-WW88

Vulnerability from github – Published: 2026-05-06 17:57 – Updated: 2026-05-06 17:57

Summary

phpseclib: guardrails needed on isPrime and randomPrime

Details

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

Severity

7.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpseclib/phpseclib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.1"
            },
            {
              "fixed": "1.0.23"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpseclib/phpseclib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.0.0"
            },
            {
              "fixed": "2.0.47"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Packagist",
        "name": "phpseclib/phpseclib"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.0.0"
            },
            {
              "fixed": "3.0.36"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2024-27354"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T17:57:10Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "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",
  "id": "GHSA-2528-jw5q-ww88",
  "modified": "2026-05-06T17:57:10Z",
  "published": "2026-05-06T17:57:10Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/security/advisories/GHSA-2528-jw5q-ww88"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-27354"
    },
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/commit/2870c8fab3f132d2ed40a66c97a36fe5ab625698"
    },
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/commit/ad5dbdf2129f5e0fb644637770b7f33de8ca8575"
    },
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/commit/c55b75199ec8d12cec6eadf6da99da4a3712fe56"
    },
    {
      "type": "WEB",
      "url": "https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/FriendsOfPHP/security-advisories/blob/master/phpseclib/phpseclib/CVE-2024-27354.yaml"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/phpseclib/phpseclib"
    },
    {
      "type": "WEB",
      "url": "https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "phpseclib: guardrails needed on isPrime and randomPrime"
}

CVE-2024-27354 (GCVE-0-2024-27354)

Vulnerability from cvelistv5 – Published: 2024-03-01 00:00 – Updated: 2025-04-22 15:44

Summary

An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). NOTE: this issue was introduced when attempting to fix CVE-2023-27560.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

n/a
CWE-400 - Uncontrolled Resource Consumption

Assigner

mitre

References

4 references

URL	Tags
https://github.com/phpseclib/phpseclib/blob/maste…
https://gist.github.com/katzj/ee72f3c2a00590812b2…
https://lists.debian.org/debian-lts-announce/2024…	mailing-list
https://lists.debian.org/debian-lts-announce/2024…	mailing-list

Impacted products

3 products

Vendor	Product	Version
phpseclib	1x	Affected: 0 , < 1.0.23 (custom) cpe:2.3:a:phpseclib:1x::::::::
phpseclib	2x	Affected: 0 , < 2.0.47 (custom) cpe:2.3:a:phpseclib:2x::::::::
phpseclib	3x	Affected: 0 , < 3.0.36 (custom) cpe:2.3:a:phpseclib:3x::::::::

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "affected": [
          {
            "cpes": [
              "cpe:2.3:a:phpseclib:1x:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "1x",
            "vendor": "phpseclib",
            "versions": [
              {
                "lessThan": "1.0.23",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:phpseclib:2x:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "2x",
            "vendor": "phpseclib",
            "versions": [
              {
                "lessThan": "2.0.47",
                "status": "affected",
                "version": "0",
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              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:a:phpseclib:3x:*:*:*:*:*:*:*:*"
            ],
            "defaultStatus": "unknown",
            "product": "3x",
            "vendor": "phpseclib",
            "versions": [
              {
                "lessThan": "3.0.36",
                "status": "affected",
                "version": "0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-27354",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-03-06T15:59:46.617242Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
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                "cweId": "CWE-400",
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                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:34:51.419Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b"
          },
          {
            "name": "[debian-lts-announce] 20240305 [SECURITY] [DLA 3749-1] phpseclib security update",
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            "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html"
          },
          {
            "name": "[debian-lts-announce] 20240305 [SECURITY] [DLA 3750-1] php-phpseclib security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
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      ],
      "descriptions": [
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          "lang": "en",
          "value": "An issue was discovered in phpseclib 1.x before 1.0.23, 2.x before 2.0.47, and 3.x before 3.0.36. An attacker can construct a malformed certificate containing an extremely large prime to cause a denial of service (CPU consumption for an isPrime primality check). NOTE: this issue was introduced when attempting to fix CVE-2023-27560."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-03-05T15:06:04.069Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/phpseclib/phpseclib/blob/master/phpseclib/Math/PrimeField.php#L49"
        },
        {
          "url": "https://gist.github.com/katzj/ee72f3c2a00590812b2ea3c0c8890e0b"
        },
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          "name": "[debian-lts-announce] 20240305 [SECURITY] [DLA 3749-1] phpseclib security update",
          "tags": [
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          "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00002.html"
        },
        {
          "name": "[debian-lts-announce] 20240305 [SECURITY] [DLA 3750-1] php-phpseclib security update",
          "tags": [
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          ],
          "url": "https://lists.debian.org/debian-lts-announce/2024/03/msg00003.html"
        }
      ]
    }
  },
  "cveMetadata": {
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    "assignerShortName": "mitre",
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    "datePublished": "2024-03-01T00:00:00.000Z",
    "dateReserved": "2024-02-25T00:00:00.000Z",
    "dateUpdated": "2025-04-22T15:44:47.697Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

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