Vulnerability-Lookup

WID-SEC-W-2026-1308

Vulnerability from csaf_certbund - Published: 2026-04-28 22:00 - Updated: 2026-05-12 22:00

Summary

OWASP ModSecurity: Mehrere Schwachstellen ermöglichen Denial of Service

Severity

Mittel

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: ModSecurity ist eine Open Source Web Application Firewall, die für verschiedene Webserver verfügbar ist.

Angriff: Ein Angreifer kann mehrere Schwachstellen in OWASP ModSecurity ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme: - Linux - UNIX - Windows

CVE-2026-30923

Affected products

Known affected 3 products

Product	Identifier	Version
SUSE openSUSE SUSE	`cpe:/o:suse:opensuse:-`	—
OWASP ModSecurity <3.0.15 OWASP / ModSecurity		<3.0.15
OWASP ModSecurity OWASP / ModSecurity	`cpe:/a:owasp:modsecurity:-`	—

CVE-2026-42268

Affected products

Known affected 3 products

Product	Identifier	Version
SUSE openSUSE SUSE	`cpe:/o:suse:opensuse:-`	—
OWASP ModSecurity <3.0.15 OWASP / ModSecurity		<3.0.15
OWASP ModSecurity OWASP / ModSecurity	`cpe:/a:owasp:modsecurity:-`	—

References

5 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://github.com/owasp-modsecurity/ModSecurity/…	external
https://github.com/owasp-modsecurity/ModSecurity/…	external
https://lists.opensuse.org/archives/list/security…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "ModSecurity ist eine Open Source Web Application Firewall, die f\u00fcr verschiedene Webserver verf\u00fcgbar ist.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein Angreifer kann mehrere Schwachstellen in OWASP ModSecurity ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1308 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1308.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1308 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1308"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-qrjc-3jpc-3h2g vom 2026-04-28",
        "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qrjc-3jpc-3h2g"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-vwr3-7x7g-7p9w vom 2026-04-28",
        "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2026:10732-1 vom 2026-05-11",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/YP5WXNKBFPO3T4B3EJ2PDP2KFFDJQIOQ/"
      }
    ],
    "source_lang": "en-US",
    "title": "OWASP ModSecurity: Mehrere Schwachstellen erm\u00f6glichen Denial of Service",
    "tracking": {
      "current_release_date": "2026-05-12T22:00:00.000+00:00",
      "generator": {
        "date": "2026-05-13T07:47:09.627+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-1308",
      "initial_release_date": "2026-04-28T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-04-28T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-05-05T22:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-27422"
        },
        {
          "date": "2026-05-11T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von openSUSE aufgenommen"
        },
        {
          "date": "2026-05-12T22:00:00.000+00:00",
          "number": "4",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-29854"
        }
      ],
      "status": "final",
      "version": "4"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c3.0.15",
                "product": {
                  "name": "OWASP ModSecurity \u003c3.0.15",
                  "product_id": "T053404"
                }
              },
              {
                "category": "product_version",
                "name": "3.0.15",
                "product": {
                  "name": "OWASP ModSecurity 3.0.15",
                  "product_id": "T053404-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:owasp:modsecurity:3.0.15"
                  }
                }
              },
              {
                "category": "product_name",
                "name": "OWASP ModSecurity",
                "product": {
                  "name": "OWASP ModSecurity",
                  "product_id": "T053405",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:owasp:modsecurity:-"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "ModSecurity"
          }
        ],
        "category": "vendor",
        "name": "OWASP"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE openSUSE",
            "product": {
              "name": "SUSE openSUSE",
              "product_id": "T027843",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:opensuse:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-30923",
      "product_status": {
        "known_affected": [
          "T027843",
          "T053404",
          "T053405"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-30923"
    },
    {
      "cve": "CVE-2026-42268",
      "product_status": {
        "known_affected": [
          "T027843",
          "T053404",
          "T053405"
        ]
      },
      "release_date": "2026-04-28T22:00:00.000+00:00",
      "title": "CVE-2026-42268"
    }
  ]
}

CVE-2026-30923 (GCVE-0-2026-30923)

Vulnerability from cvelistv5 – Published: 2026-05-05 18:46 – Updated: 2026-05-05 19:21

Title

libModSecurity3 denial of service via segfault when using t:hexDecode on single-character query strings

Summary

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15.

Severity

8.2 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-125 - Out-of-bounds Read

Assigner

GitHub_M

References

2 references

URL	Tags
https://github.com/owasp-modsecurity/ModSecurity/…	x_refsource_CONFIRM
https://github.com/owasp-modsecurity/ModSecurity/…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
owasp-modsecurity	ModSecurity	Affected: < 3.0.15

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-30923",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-05T19:20:55.329784Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-05T19:21:08.898Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qrjc-3jpc-3h2g"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ModSecurity",
          "vendor": "owasp-modsecurity",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.0.15"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Libmodsecurity is one component of the ModSecurity v3 project. A segmentation fault occurs when a rule using the t:hexDecode transformation inspects a query string parameter containing a single character. An attacker can exploit this to crash worker processes, causing a denial of service. Service resumes once the attack stops as worker processes recover from the segfault. All versions before 3.0.15 of libModSecurity3 are affected. This has been patched in version 3.0.15."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125: Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-05T18:46:03.201Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qrjc-3jpc-3h2g",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-qrjc-3jpc-3h2g"
        },
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.15",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/releases/tag/v3.0.15"
        }
      ],
      "source": {
        "advisory": "GHSA-qrjc-3jpc-3h2g",
        "discovery": "UNKNOWN"
      },
      "title": "libModSecurity3 denial of service via segfault when using t:hexDecode on single-character query strings"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-30923",
    "datePublished": "2026-05-05T18:46:03.201Z",
    "dateReserved": "2026-03-07T16:40:05.884Z",
    "dateUpdated": "2026-05-05T19:21:08.898Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-42268 (GCVE-0-2026-42268)

Vulnerability from cvelistv5 – Published: 2026-05-12 21:40 – Updated: 2026-05-14 12:34

Title

ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators

Summary

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is an unhandled exception (std::out_of_range) caused by unsigned integer underflow in libmodsecurity3 if the user (administrator) uses a rule any of @verifySSN, @verifyCPF, or @verifySVNR. This vulnerability is fixed in 3.0.15.

Severity

8.2 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator (v2.0.3)

CWE

CWE-191 - Integer Underflow (Wrap or Wraparound)
CWE-248 - Uncaught Exception

Assigner

GitHub_M

References

1 reference

URL	Tags
https://github.com/owasp-modsecurity/ModSecurity/…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
owasp-modsecurity	ModSecurity	Affected: >= 3.0.0, < 3.0.15

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42268",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-14T12:34:17.448480Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-14T12:34:20.932Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "ModSecurity",
          "vendor": "owasp-modsecurity",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 3.0.0, \u003c 3.0.15"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. From 3.0.0 to before 3.0.15, there is an unhandled exception (std::out_of_range) caused by unsigned integer underflow in libmodsecurity3 if the user (administrator) uses a rule any of @verifySSN, @verifyCPF, or @verifySVNR. This vulnerability is fixed in 3.0.15."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 8.2,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-191",
              "description": "CWE-191: Integer Underflow (Wrap or Wraparound)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-248",
              "description": "CWE-248: Uncaught Exception",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-12T21:40:19.031Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-vwr3-7x7g-7p9w"
        }
      ],
      "source": {
        "advisory": "GHSA-vwr3-7x7g-7p9w",
        "discovery": "UNKNOWN"
      },
      "title": "ModSecurity: Unsigned integer underflow in @verifySSN / @verifyCPF / @verifySVNR operators"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42268",
    "datePublished": "2026-05-12T21:40:19.031Z",
    "dateReserved": "2026-04-26T11:53:27.706Z",
    "dateUpdated": "2026-05-14T12:34:20.932Z",
    "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

WID-SEC-W-2026-1308

CVE-2026-30923 (GCVE-0-2026-30923)

CVE-2026-42268 (GCVE-0-2026-42268)

Tags

Sightings

Nomenclature