Vulnerability-Lookup

Vulnerability from bitnami_vulndb

Published

2026-05-12 08:50

Modified

2026-05-12 09:14

Summary

Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()

Details

In PHP versions 8.2. before 8.2.31, 8.3. before 8.3.31, 8.4. before 8.4.21, and 8.5. before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Bitnami",
        "name": "libphp",
        "purl": "pkg:bitnami/libphp"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "8.2.0"
            },
            {
              "fixed": "8.2.31"
            },
            {
              "introduced": "8.3.0"
            },
            {
              "fixed": "8.3.31"
            },
            {
              "introduced": "8.4.0"
            },
            {
              "fixed": "8.4.21"
            },
            {
              "introduced": "8.5.0"
            },
            {
              "fixed": "8.5.6"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "severity": [
        {
          "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:Y/R:X/V:X/RE:X/U:Amber",
          "type": "CVSS_V4"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-7259"
  ],
  "database_specific": {
    "cpes": [
      "cpe:2.3:a:php:php:*:*:*:*:*:*:*:*"
    ],
    "severity": "Low"
  },
  "details": "In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to\u00a0\u00a0a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to\u00a0mb_regex_encoding().",
  "id": "BIT-libphp-2026-7259",
  "modified": "2026-05-12T09:14:35.689Z",
  "published": "2026-05-12T08:50:27.221Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-7259"
    }
  ],
  "schema_version": "1.6.2",
  "summary": "Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()"
}

CVE-2026-7259 (GCVE-0-2026-7259)

Vulnerability from cvelistv5 – Published: 2026-05-10 04:13 – Updated: 2026-05-11 13:13

Title

Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()

Summary

In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().

Severity ?

2.1 (Low)


                        
                          CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/U:Amber

CWE

CWE-476 - NULL Pointer Dereference

Assigner

php

References

1 reference

URL	Tags
https://github.com/php/php-src/security/advisorie…	vendor-advisory

Impacted products

1 product

Vendor	Product	Version
PHP Group	PHP	Affected: 8.2.* , < 8.2.31 (semver) Affected: 8.3.* , < 8.3.31 (semver) Affected: 8.4.* , < 8.4.21 (semver) Affected: 8.5.* , < 8.5.6 (semver)

Date Public ?

2026-05-07 00:00

Credits

Viet Hoang Luu (The University of Melbourne) Amirmohammad Pasdar (The University of Melbourne) Wachiraphan Charoenwet (The University of Melbourne) Shaanan Cohney (The University of Melbourne) Toby Murray (The University of Melbourne) Van-Thuan Pham (The University of Melbourne) Ilija Tovilo

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-7259",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-11T13:12:58.875843Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-11T13:13:50.416Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "affected",
          "packageName": "mbstring",
          "product": "PHP",
          "vendor": "PHP Group",
          "versions": [
            {
              "lessThan": "8.2.31",
              "status": "affected",
              "version": "8.2.*",
              "versionType": "semver"
            },
            {
              "lessThan": "8.3.31",
              "status": "affected",
              "version": "8.3.*",
              "versionType": "semver"
            },
            {
              "lessThan": "8.4.21",
              "status": "affected",
              "version": "8.4.*",
              "versionType": "semver"
            },
            {
              "lessThan": "8.5.6",
              "status": "affected",
              "version": "8.5.*",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Viet Hoang Luu (The University of Melbourne)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Amirmohammad Pasdar (The University of Melbourne)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Wachiraphan Charoenwet (The University of Melbourne)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Shaanan Cohney (The University of Melbourne)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Toby Murray (The University of Melbourne)"
        },
        {
          "lang": "en",
          "type": "reporter",
          "value": "Van-Thuan Pham (The University of Melbourne)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Ilija Tovilo"
        }
      ],
      "datePublic": "2026-05-07T00:00:00.000Z",
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to\u0026nbsp;\u0026nbsp;a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to\u0026nbsp;\u003ccode\u003emb_regex_encoding()\u003c/code\u003e."
            }
          ],
          "value": "In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, a mismatch between encoding lists in Oniguruma and mbfl leads to\u00a0\u00a0a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to\u00a0mb_regex_encoding()."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "YES",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.1,
            "baseSeverity": "LOW",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "AMBER",
            "subAvailabilityImpact": "LOW",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "ACTIVE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/AU:Y/U:Amber",
            "version": "4.0",
            "vulnAvailabilityImpact": "LOW",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-476",
              "description": "CWE-476 NULL Pointer Dereference",
              "lang": "en",
              "type": "CWE"
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-10T04:13:26.766Z",
        "orgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b",
        "shortName": "php"
      },
      "references": [
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75"
        }
      ],
      "source": {
        "advisory": "GHSA-wm6j-2649-pv75",
        "discovery": "EXTERNAL"
      },
      "title": "Null pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "dd77f84a-d19a-4638-8c3d-a322d820ed2b",
    "assignerShortName": "php",
    "cveId": "CVE-2026-7259",
    "datePublished": "2026-05-10T04:13:26.766Z",
    "dateReserved": "2026-04-28T05:07:03.118Z",
    "dateUpdated": "2026-05-11T13:13:50.416Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

Vulnerability from bitnami_vulndb

CVE-2026-7259 (GCVE-0-2026-7259)

Tags

Sightings

Nomenclature