Vulnerability-Lookup

(CVE-2026-34480)

Vulnerability from cleanstart – Published: 2026-09-18 10:21 – Updated: 2026-04-15 10:18 – Source website

Summary

Security fix for CVE-2026-34480 applied in: activemq 5.19.3-r1, activemq 6.2.3-r1, activemq 6.2.8-r2, apache-hive 4.0.0-r0, apache-hive 4.2.0-r0, confluent-kafka 8.2.0-r0, elasticsearch 9.2.7-r2, elasticsearch 9.2.8-r2, flink 2.0.2-r1, flink 2.1.3-r1, kafka 4.0.1-r4, kafka 4.0.2-r0, kafka 4.1.2-r0, kafka-fips 3.8.1-r10, kafka-fips 4.0.2-r1, kserve-modelmesh 0.10.0-r0, kserve-modelmesh 0.12.0-r0, opensearch 2.19.5-r0, schema-registry 8.1.2-r0, sonarqube 25.12.0.117093-r3, sonarqube 26.4.0.121862-r2, spark 3.5.9-r2, spark-sc213-jdk17-py311 4.1.1-r2, strimzi-kafka-operator 0.50.1-r2, strimzi-kafka-operator 0.51.0-r1, wavefront-proxy 13.9-r1, wso2is 7.2.0-r2

Details

CVE-2026-34480 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-34480	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-34480	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "activemq"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "0"
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            {
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          "type": "ECOSYSTEM"
        }
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    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "activemq"
      },
      "ranges": [
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          "events": [
            {
              "introduced": "0"
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      "package": {
        "ecosystem": "CleanStart",
        "name": "activemq"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
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            {
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      "package": {
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    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "confluent-kafka"
      },
      "ranges": [
        {
          "events": [
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              "introduced": "0"
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              "fixed": "8.2.0-r0"
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    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "elasticsearch"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.2.7-r2"
            }
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          "type": "ECOSYSTEM"
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      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "elasticsearch"
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      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.2.8-r2"
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          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "flink"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.2-r1"
            }
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          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "flink"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.1.3-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "kafka"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.0.1-r4"
            }
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      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
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            {
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            {
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    {
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        "name": "kafka-fips"
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        {
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            {
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            {
              "fixed": "3.8.1-r10"
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          "type": "ECOSYSTEM"
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      ]
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    {
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        {
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            {
              "fixed": "4.0.2-r1"
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          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "kserve-modelmesh"
      },
      "ranges": [
        {
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            {
              "introduced": "0"
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              "fixed": "0.10.0-r0"
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        }
      ]
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    {
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            },
            {
              "fixed": "0.12.0-r0"
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          ],
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        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "opensearch"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.19.5-r0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "schema-registry"
      },
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        {
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              "introduced": "0"
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            {
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          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "sonarqube"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "25.12.0.117093-r3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "sonarqube"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "26.4.0.121862-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "spark"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.5.9-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "spark-sc213-jdk17-py311"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.1.1-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "strimzi-kafka-operator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.50.1-r2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "strimzi-kafka-operator"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.51.0-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "wavefront-proxy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "13.9-r1"
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          ],
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    {
      "package": {
        "ecosystem": "CleanStart",
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      },
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        {
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          ],
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  ],
  "credits": [],
  "database_specific": {},
  "details": "CVE-2026-34480 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.",
  "id": "CLEANSTART-2026-OV82681",
  "modified": "2026-04-15T10:18:15Z",
  "published": "2026-09-18T10:21:53.119416Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-OV82681.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-34480"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34480"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fix for CVE-2026-34480 applied in: activemq 5.19.3-r1, activemq 6.2.3-r1, activemq 6.2.8-r2, apache-hive 4.0.0-r0, apache-hive 4.2.0-r0, confluent-kafka 8.2.0-r0, elasticsearch 9.2.7-r2, elasticsearch 9.2.8-r2, flink 2.0.2-r1, flink 2.1.3-r1, kafka 4.0.1-r4, kafka 4.0.2-r0, kafka 4.1.2-r0, kafka-fips 3.8.1-r10, kafka-fips 4.0.2-r1, kserve-modelmesh 0.10.0-r0, kserve-modelmesh 0.12.0-r0, opensearch 2.19.5-r0, schema-registry 8.1.2-r0, sonarqube 25.12.0.117093-r3, sonarqube 26.4.0.121862-r2, spark 3.5.9-r2, spark-sc213-jdk17-py311 4.1.1-r2, strimzi-kafka-operator 0.50.1-r2, strimzi-kafka-operator 0.51.0-r1, wavefront-proxy 13.9-r1, wso2is 7.2.0-r2",
  "upstream": [
    "CVE-2026-34480"
  ]
}

CVE-2026-34480 (GCVE-0-2026-34480)

Vulnerability from cvelistv5 – Published: 2026-04-10 15:42 – Updated: 2026-04-10 17:45

Title

Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters

Summary

Apache Log4j Core's XmlLayout https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout , in versions up to and including 2.25.3, fails to sanitize characters forbidden by the XML 1.0 specification https://www.w3.org/TR/xml/#charsets producing invalid XML output whenever a log message or MDC value contains such characters. The impact depends on the StAX implementation in use: * JRE built-in StAX: Forbidden characters are silently written to the output, producing malformed XML. Conforming parsers must reject such documents with a fatal error, which may cause downstream log-processing systems to drop the affected records. * Alternative StAX implementations (e.g., Woodstox https://github.com/FasterXML/woodstox , a transitive dependency of the Jackson XML Dataformat module): An exception is thrown during the logging call, and the log event is never delivered to its intended appender, only to Log4j's internal status logger. Users are advised to upgrade to Apache Log4j Core 2.25.4, which corrects this issue by sanitizing forbidden characters before XML output.

Severity

6.9 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-10 17:43 UTC

CWE

CWE-116 - Improper Encoding or Escaping of Output

Assigner

apache mitre root

References

6 references

URL	Tags
https://github.com/apache/logging-log4j2/pull/4077	patch
https://logging.apache.org/security.html#CVE-2026-34480	vendor-advisory
https://logging.apache.org/cyclonedx/vdr.xml	vendor-advisory
https://logging.apache.org/log4j/2.x/manual/layou…	related
https://lists.apache.org/thread/5x0hcnng0chhghp6j…	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/04/10/9

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache Log4j Core	Affected: 2.0-alpha1 , < 2.25.4 (maven) Affected: 3.0.0-alpha1 , ≤ 3.0.0-beta3 (maven) cpe:2.3:a:apache:log4j::::::::

Credits

Ap4sh (Samy Medjahed) and Ethicxz (Eliott Laurie) (original reporters) jabaltarik1 (independently)

Show details on NVD website

JSON

To clipboard

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            "related"
          ],
          "url": "https://logging.apache.org/log4j/2.x/manual/layouts.html#XmlLayout"
        },
        {
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://lists.apache.org/thread/5x0hcnng0chhghp6jgjdp3qmbbhfjzhb"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "timeline": [
        {
          "lang": "en",
          "time": "2026-02-16T17:11:00.000Z",
          "value": "Vulnerability reported by Ap4sh and ethicxz"
        },
        {
          "lang": "en",
          "time": "2026-03-10T20:15:00.000Z",
          "value": "Candidate patch shared internally by Piotr P. Karwasz"
        },
        {
          "lang": "en",
          "time": "2026-03-15T05:39:00.000Z",
          "value": "Independent report received from jabaltarik1"
        },
        {
          "lang": "en",
          "time": "2026-03-24T18:52:00.000Z",
          "value": "Fix shared publicly by Piotr P. Karwasz as pull request #4077"
        },
        {
          "lang": "en",
          "time": "2026-03-25T09:46:00.000Z",
          "value": "Fix verified by reporter"
        },
        {
          "lang": "en",
          "time": "2026-03-28T11:19:00.000Z",
          "value": "Log4j 2.25.4 released"
        }
      ],
      "title": "Apache Log4j Core: Silent log event loss in XmlLayout due to unescaped XML 1.0 forbidden characters",
      "x_generator": {
        "engine": "Vulnogram 0.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09",
    "assignerShortName": "apache",
    "cveId": "CVE-2026-34480",
    "datePublished": "2026-04-10T15:42:03.843Z",
    "dateReserved": "2026-03-28T15:29:27.095Z",
    "dateUpdated": "2026-04-10T17:45:07.434Z",
    "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.

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.