Vulnerability-Lookup

CVE-2026-91858 (GCVE-0-2026-91858)

Vulnerability from cvelistv5 – Published: 2026-10-19 10:47 – Updated: 2026-10-19 14:30

Title

Apache Camel: Camel-FOP Resolves External DTDs and Entities From Untrusted XSL-FO Input When a Third-Party JAXP TransformerFactory Is Present

Summary

FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK's built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-19 14:29 UTC

CWE

CWE-611 - Improper Restriction of XML External Entity Reference

Assigner

apache CNA under the mitre root

CNA scorecard B 76/100 over 1004 records in the last 180 days details

References

5 references

URL	Tags
https://camel.apache.org/security/CVE-2026-91858.html	vendor-advisory
https://issues.apache.org/jira/browse/CAMEL-24605	issue-tracking
https://github.com/apache/camel/pull/26108	patch
https://github.com/apache/camel/pull/26168	patch
https://github.com/apache/camel/pull/26169	patch

Impacted products

1 product

Vendor	Product	Version	CPE status
Apache Software Foundation	Apache Camel	Affected: 4.0.0 , < 4.18.5 (maven) Affected: 4.19.0 , < 4.22.1 (maven)	guessed

Credits

Andrea Cosentino Andrea Cosentino

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-91858",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-19T14:29:43.649018Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-19T14:30:10.376Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.camel:camel-fop",
          "packageURL": "pkg:maven/org.apache.camel/camel-fop",
          "product": "Apache Camel",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "4.18.5",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "maven"
            },
            {
              "lessThan": "4.22.1",
              "status": "affected",
              "version": "4.19.0",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Andrea Cosentino"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Andrea Cosentino"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eFopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix.\u003c/p\u003e"
            }
          ],
          "value": "FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-611",
              "description": "CWE-611 Improper Restriction of XML External Entity Reference",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T10:47:48.267Z",
        "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "shortName": "apache"
      },
      "references": [
        {
          "name": "Apache Camel Security Advisory - CVE-2026-91858",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://camel.apache.org/security/CVE-2026-91858.html"
        },
        {
          "name": "CAMEL-24605",
          "tags": [
            "issue-tracking"
          ],
          "url": "https://issues.apache.org/jira/browse/CAMEL-24605"
        },
        {
          "name": "Fix on main, released in 4.23.0 (commit 209c67a851d3c145583d25829b7ffac0c500674b)",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/apache/camel/pull/26108"
        },
        {
          "name": "Backport to camel-4.22.x, released in 4.22.1 (commit f689a9c92f0e6c406f9a0256c7d940024cf56782)",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/apache/camel/pull/26168"
        },
        {
          "name": "Backport to camel-4.18.x, released in 4.18.5 (commit 9c06c6d265d70be30023e7514456b697e91db69e)",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/apache/camel/pull/26169"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eUsers are recommended to upgrade to version 4.23.0, which fixes the issue. If users are on the 4.22.x releases stream, then they are suggested to upgrade to 4.22.1. If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.5. FopProducer now also sets ACCESS_EXTERNAL_DTD and ACCESS_EXTERNAL_STYLESHEET to the empty string on the TransformerFactory it creates, in addition to FEATURE_SECURE_PROCESSING, matching the secure XML processing configuration used by org.apache.camel.converter.jaxp.XmlConverter, so external DTD and stylesheet access is refused on any JAXP implementation that honours those attributes. The 4.14.x releases stream and earlier reached end of life before this issue was resolved and will not receive a fix, so deployments on those lines must move to a supported release.\u003c/p\u003e"
            }
          ],
          "value": "Users are recommended to upgrade to version 4.23.0, which fixes the issue. If users are on the 4.22.x releases stream, then they are suggested to upgrade to 4.22.1. If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.5. FopProducer now also sets ACCESS_EXTERNAL_DTD and ACCESS_EXTERNAL_STYLESHEET to the empty string on the TransformerFactory it creates, in addition to FEATURE_SECURE_PROCESSING, matching the secure XML processing configuration used by org.apache.camel.converter.jaxp.XmlConverter, so external DTD and stylesheet access is refused on any JAXP implementation that honours those attributes. The 4.14.x releases stream and earlier reached end of life before this issue was resolved and will not receive a fix, so deployments on those lines must move to a supported release."
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Apache Camel: Camel-FOP Resolves External DTDs and Entities From Untrusted XSL-FO Input When a Third-Party JAXP TransformerFactory Is Present",
      "workarounds": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "\u003cp\u003eFor deployments that cannot upgrade immediately, do not send untrusted XSL-FO to a fop producer. Alternatively, remove the third-party JAXP TransformerFactory such as Saxon-HE from the classpath, so that the JDK\u0027s built-in transformer is used, which already refuses external DTDs and external entities when secure processing is enabled.\u003c/p\u003e"
            }
          ],
          "value": "For deployments that cannot upgrade immediately, do not send untrusted XSL-FO to a fop producer. Alternatively, remove the third-party JAXP TransformerFactory such as Saxon-HE from the classpath, so that the JDK\u0027s built-in transformer is used, which already refuses external DTDs and external entities when secure processing is enabled."
        }
      ],
      "x_generator": {
        "engine": "Vulnogram 1.0.3"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-91858",
    "datePublished": "2026-10-19T10:47:48.267Z",
    "dateReserved": "2026-09-15T09:22:12.094Z",
    "dateUpdated": "2026-10-19T14:30:10.376Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "collectionURL": "https://repo.maven.apache.org/maven2",
                "defaultStatus": "unaffected",
                "packageName": "org.apache.camel:camel-fop",
                "packageURL": "pkg:maven/org.apache.camel/camel-fop",
                "product": "Apache Camel",
                "vendor": "Apache Software Foundation",
                "versions": [
                  {
                    "lessThan": "4.18.5",
                    "status": "affected",
                    "version": "4.0.0",
                    "versionType": "maven"
                  },
                  {
                    "lessThan": "4.22.1",
                    "status": "affected",
                    "version": "4.19.0",
                    "versionType": "maven"
                  }
                ]
              }
            ],
            "source": "security@apache.org"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix."
          }
        ],
        "id": "CVE-2026-91858",
        "lastModified": "2026-10-19T15:17:09.623",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
                "version": "3.1"
              },
              "exploitabilityScore": 2.2,
              "impactScore": 4.2,
              "source": "security@apache.org",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2026-91858",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-19T14:29:43.649018Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2026-10-19T11:17:25.683",
        "references": [
          {
            "source": "security@apache.org",
            "url": "https://camel.apache.org/security/CVE-2026-91858.html"
          },
          {
            "source": "security@apache.org",
            "url": "https://github.com/apache/camel/pull/26108"
          },
          {
            "source": "security@apache.org",
            "url": "https://github.com/apache/camel/pull/26168"
          },
          {
            "source": "security@apache.org",
            "url": "https://github.com/apache/camel/pull/26169"
          },
          {
            "source": "security@apache.org",
            "url": "https://issues.apache.org/jira/browse/CAMEL-24605"
          }
        ],
        "sourceIdentifier": "security@apache.org",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-611"
              }
            ],
            "source": "security@apache.org",
            "type": "Secondary"
          }
        ]
      }
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-91858",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-19T14:29:43.649018Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-19T14:29:58.850Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "collectionURL": "https://repo.maven.apache.org/maven2",
              "defaultStatus": "unaffected",
              "packageName": "org.apache.camel:camel-fop",
              "packageURL": "pkg:maven/org.apache.camel/camel-fop",
              "product": "Apache Camel",
              "vendor": "Apache Software Foundation",
              "versions": [
                {
                  "lessThan": "4.18.5",
                  "status": "affected",
                  "version": "4.0.0",
                  "versionType": "maven"
                },
                {
                  "lessThan": "4.22.1",
                  "status": "affected",
                  "version": "4.19.0",
                  "versionType": "maven"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "Andrea Cosentino"
            },
            {
              "lang": "en",
              "type": "remediation developer",
              "value": "Andrea Cosentino"
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eFopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix.\u003c/p\u003e"
                }
              ],
              "value": "FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "NONE",
                "baseScore": 6.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "LOW",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-611",
                  "description": "CWE-611 Improper Restriction of XML External Entity Reference",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-10-19T10:47:48.267Z",
            "orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
            "shortName": "apache"
          },
          "references": [
            {
              "name": "Apache Camel Security Advisory - CVE-2026-91858",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://camel.apache.org/security/CVE-2026-91858.html"
            },
            {
              "name": "CAMEL-24605",
              "tags": [
                "issue-tracking"
              ],
              "url": "https://issues.apache.org/jira/browse/CAMEL-24605"
            },
            {
              "name": "Fix on main, released in 4.23.0 (commit 209c67a851d3c145583d25829b7ffac0c500674b)",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/apache/camel/pull/26108"
            },
            {
              "name": "Backport to camel-4.22.x, released in 4.22.1 (commit f689a9c92f0e6c406f9a0256c7d940024cf56782)",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/apache/camel/pull/26168"
            },
            {
              "name": "Backport to camel-4.18.x, released in 4.18.5 (commit 9c06c6d265d70be30023e7514456b697e91db69e)",
              "tags": [
                "patch"
              ],
              "url": "https://github.com/apache/camel/pull/26169"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eUsers are recommended to upgrade to version 4.23.0, which fixes the issue. If users are on the 4.22.x releases stream, then they are suggested to upgrade to 4.22.1. If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.5. FopProducer now also sets ACCESS_EXTERNAL_DTD and ACCESS_EXTERNAL_STYLESHEET to the empty string on the TransformerFactory it creates, in addition to FEATURE_SECURE_PROCESSING, matching the secure XML processing configuration used by org.apache.camel.converter.jaxp.XmlConverter, so external DTD and stylesheet access is refused on any JAXP implementation that honours those attributes. The 4.14.x releases stream and earlier reached end of life before this issue was resolved and will not receive a fix, so deployments on those lines must move to a supported release.\u003c/p\u003e"
                }
              ],
              "value": "Users are recommended to upgrade to version 4.23.0, which fixes the issue. If users are on the 4.22.x releases stream, then they are suggested to upgrade to 4.22.1. If users are on the 4.18.x releases stream, then they are suggested to upgrade to 4.18.5. FopProducer now also sets ACCESS_EXTERNAL_DTD and ACCESS_EXTERNAL_STYLESHEET to the empty string on the TransformerFactory it creates, in addition to FEATURE_SECURE_PROCESSING, matching the secure XML processing configuration used by org.apache.camel.converter.jaxp.XmlConverter, so external DTD and stylesheet access is refused on any JAXP implementation that honours those attributes. The 4.14.x releases stream and earlier reached end of life before this issue was resolved and will not receive a fix, so deployments on those lines must move to a supported release."
            }
          ],
          "source": {
            "discovery": "UNKNOWN"
          },
          "title": "Apache Camel: Camel-FOP Resolves External DTDs and Entities From Untrusted XSL-FO Input When a Third-Party JAXP TransformerFactory Is Present",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eFor deployments that cannot upgrade immediately, do not send untrusted XSL-FO to a fop producer. Alternatively, remove the third-party JAXP TransformerFactory such as Saxon-HE from the classpath, so that the JDK\u0027s built-in transformer is used, which already refuses external DTDs and external entities when secure processing is enabled.\u003c/p\u003e"
                }
              ],
              "value": "For deployments that cannot upgrade immediately, do not send untrusted XSL-FO to a fop producer. Alternatively, remove the third-party JAXP TransformerFactory such as Saxon-HE from the classpath, so that the JDK\u0027s built-in transformer is used, which already refuses external DTDs and external entities when secure processing is enabled."
            }
          ],
          "x_generator": {
            "engine": "Vulnogram 1.0.3"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
        "assignerShortName": "apache",
        "cveId": "CVE-2026-91858",
        "datePublished": "2026-10-19T10:47:48.267Z",
        "dateReserved": "2026-09-15T09:22:12.094Z",
        "dateUpdated": "2026-10-19T14:30:10.376Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-91858

Vulnerability from fkie_nvd - Published: 2026-10-19 11:17 - Updated: 2026-10-19 15:17

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Summary

References

	URL	Tags
	security@apache.org	https://camel.apache.org/security/CVE-2026-91858.html
	security@apache.org	https://github.com/apache/camel/pull/26108
	security@apache.org	https://github.com/apache/camel/pull/26168
	security@apache.org	https://github.com/apache/camel/pull/26169
	security@apache.org	https://issues.apache.org/jira/browse/CAMEL-24605

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.camel:camel-fop",
          "packageURL": "pkg:maven/org.apache.camel/camel-fop",
          "product": "Apache Camel",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "4.18.5",
              "status": "affected",
              "version": "4.0.0",
              "versionType": "maven"
            },
            {
              "lessThan": "4.22.1",
              "status": "affected",
              "version": "4.19.0",
              "versionType": "maven"
            }
          ]
        }
      ],
      "source": "security@apache.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix."
    }
  ],
  "id": "CVE-2026-91858",
  "lastModified": "2026-10-19T15:17:09.623",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 4.2,
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-91858",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-19T14:29:43.649018Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-19T11:17:25.683",
  "references": [
    {
      "source": "security@apache.org",
      "url": "https://camel.apache.org/security/CVE-2026-91858.html"
    },
    {
      "source": "security@apache.org",
      "url": "https://github.com/apache/camel/pull/26108"
    },
    {
      "source": "security@apache.org",
      "url": "https://github.com/apache/camel/pull/26168"
    },
    {
      "source": "security@apache.org",
      "url": "https://github.com/apache/camel/pull/26169"
    },
    {
      "source": "security@apache.org",
      "url": "https://issues.apache.org/jira/browse/CAMEL-24605"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-611"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}

GHSA-QRG3-HXWC-36JM

Vulnerability from github – Published: 2026-10-19 12:32 – Updated: 2026-10-19 12:32

Details

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-91858"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-611"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-19T11:17:25Z",
    "severity": "MODERATE"
  },
  "details": "FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK\u0027s built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix.",
  "id": "GHSA-qrg3-hxwc-36jm",
  "modified": "2026-10-19T12:32:52Z",
  "published": "2026-10-19T12:32:52Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91858"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/camel/pull/26108"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/camel/pull/26168"
    },
    {
      "type": "WEB",
      "url": "https://github.com/apache/camel/pull/26169"
    },
    {
      "type": "WEB",
      "url": "https://camel.apache.org/security/CVE-2026-91858.html"
    },
    {
      "type": "WEB",
      "url": "https://issues.apache.org/jira/browse/CAMEL-24605"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-91858 (GCVE-0-2026-91858)

FKIE_CVE-2026-91858

GHSA-QRG3-HXWC-36JM

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour