Vulnerability-Lookup

UBUNTU-CVE-2026-1225 (CVE-2026-1225)

Vulnerability from osv_ubuntu – Published: 2026-01-22 10:16 – Updated: 2026-05-20 15:24 – Source website

Details

ACE vulnerability in configuration file processing by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file. The instantiation of a potentially malicious Java class requires that said class is present on the user's class-path. In addition, the attacker must have write access to a configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.

Severity

1.8 (Low)


                    
                      CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-1225	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-1225	REPORT
	https://logback.qos.ch/news.html#1.5.25	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.1.3-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.1.3-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.1.3-2",
        "1:1.1.3-2ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.2.3-2ubuntu1~18.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.3-2ubuntu1~18.04.1+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.1.9-4",
        "1:1.1.9-5",
        "1:1.2.3-2",
        "1:1.2.3-2ubuntu1~18.04.1",
        "1:1.2.3-2ubuntu1~18.04.1+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.2.3-5ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.3-5ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.3-5",
        "1:1.2.3-5ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.2.10-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.10-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.3-6",
        "1:1.2.7-1",
        "1:1.2.8-1",
        "1:1.2.9-1",
        "1:1.2.10-1",
        "1:1.2.10-1ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.2.11-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.11-5?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.11-3",
        "1:1.2.11-4",
        "1:1.2.11-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.2.11-6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.11-6?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.11-6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblogback-java",
            "binary_version": "1:1.2.11-6build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.11-6build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.11-6",
        "1:1.2.11-6build1"
      ]
    }
  ],
  "aliases": [],
  "details": "ACE vulnerability in configuration file processing  by QOS.CH logback-core up to and including version 1.5.24 in Java applications, allows an attacker to instantiate classes already present on the class path by compromising an existing logback configuration file. The instantiation of a potentially malicious Java class requires that said class is present on the user\u0027s class-path. In addition, the attacker must have write access to a configuration file. However, after successful instantiation, the instance is very likely to be discarded with no further ado.",
  "id": "UBUNTU-CVE-2026-1225",
  "modified": "2026-05-20T15:24:27Z",
  "published": "2026-01-22T10:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-1225"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-1225"
    },
    {
      "type": "REPORT",
      "url": "https://logback.qos.ch/news.html#1.5.25"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-1225"
  ]
}

CVE-2026-1225 (GCVE-0-2026-1225)

Vulnerability from cvelistv5 – Published: 2026-01-22 09:24 – Updated: 2026-01-22 14:14

Title

Malicious logback.xml configuration file allows instantiation of arbitrary classes

Summary

Severity

1.8 (Low)


                        
                          CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/S:N/AU:N/RE:M/U:Green

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-01-22 14:14 UTC

CWE

CWE-20 - Improper Input Validation

Assigner

NCSC.ch mitre root

References

1 reference

URL	Tags
https://logback.qos.ch/news.html#1.5.25

Impacted products

1 product

Vendor	Product	Version
QOS.CH Sarl	Logback-core	Affected: 0.9.20 , ≤ 1.5.24 (maven) Unaffected: 1.5.25

Credits

https://www.code-intelligence.com/ Google Fuzz

Show details on NVD website

JSON

To clipboard

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                    "Technical Impact": "partial"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "modules": [
            "logback-core",
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          "platforms": [
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          ],
          "product": "Logback-core",
          "vendor": "QOS.CH Sarl",
          "versions": [
            {
              "lessThanOrEqual": "1.5.24",
              "status": "affected",
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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.