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

Vulnerability from cvelistv5 – Published: 2026-05-10 04:13 – Updated: 2026-05-11 13:13
VLAI
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
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 13:12 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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
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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"
          }
        }
      },
      "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": "2026-05-10T04:13:26.766Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.