Vulnerability-Lookup

UBUNTU-CVE-2026-9828 (CVE-2026-9828)

Vulnerability from osv_ubuntu – Published: 2026-05-28 14:16 – Updated: 2026-10-17 09:37 – Source website

Details

Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection albeit heavily restricted. More precisely, an attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate objects from classes in the java.lang and java.util packages that are not explicitly blocked. Although deserialization is heavily restricted by HardenedObjectInputStream and no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue constitutes a bypass of the intended security restrictions. This issue affects logback: through 1.5.32 inclusive.

Severity

2.9 (Low)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-9828	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-9828	REPORT
	https://logback.qos.ch/news.html#1.5.33	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:26.10",
        "name": "logback",
        "purl": "pkg:deb/ubuntu/logback@1:1.2.11-6build1?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:1.2.11-6build1"
      ]
    },
    {
      "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": "Deserialization of untrusted data vulnerability in QOS.CH Sarl logback logback-core (HardenedObjectInputStream (logback-core) modules) allows Object Injection albeit heavily restricted. More precisely, an attacker able to influence serialized data sent to SimpleSocketServer or SimpleSSLSocketServer can instantiate objects from  classes in the java.lang and java.util packages that are not explicitly  blocked. Although deserialization is heavily restricted by HardenedObjectInputStream and no practical way to achieve remote code execution or significant privilege escalation has been identified, this issue constitutes a bypass of the intended security restrictions. This issue affects logback: through 1.5.32 inclusive.",
  "id": "UBUNTU-CVE-2026-9828",
  "modified": "2026-10-17T09:37:57Z",
  "published": "2026-05-28T14:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-9828"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-9828"
    },
    {
      "type": "REPORT",
      "url": "https://logback.qos.ch/news.html#1.5.33"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N/E:P/RE:L/U:Green",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-9828"
  ]
}

CVE-2026-9828 (GCVE-0-2026-9828)

Vulnerability from cvelistv5 – Published: 2026-05-28 12:52 – Updated: 2026-05-29 08:07

Title

Logback deserialization whitelist bypass for java.lang and java.util

Summary

Severity

2.9 (Low)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-28 14:20 UTC

CWE

CWE-502 - Deserialization of untrusted data

Assigner

NCSC.ch CNA under the mitre root

CNA scorecard B 80/100 over 81 records in the last 180 days details

References

1 reference

URL	Tags
https://logback.qos.ch/news.html#1.5.33

Impacted products

1 product

Vendor	Product	Version
QOS.CH Sarl	logback	Affected: 0 , ≤ 1.5.32 (maven) Unaffected: 1.5.33

Date Public

2026-05-28 07:47

Credits

York Shen https://github.com/york-shen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-9828",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-28T14:20:28.756230Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-28T14:20:37.401Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "HardenedObjectInputStream (logback-core)"
          ],
          "packageName": "logback-core",
          "product": "logback",
          "programFiles": [
            "HardenedObjectInputStream.java"
          ],
          "repo": "https://github.com/qos-ch/logback",
          "vendor": "QOS.CH Sarl",
          "versions": [
            {
              "lessThanOrEqual": "1.5.32",
              "status": "affected",
              "version": "0",
              "versionType": "maven"
            },
            {
              "status": "unaffected",
              "version": "1.5.33"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "SimpleSocketServer or SimpleSSLSockerServer must be running on the target host and reachable by the attacker."
            }
          ],
          "value": "SimpleSocketServer or SimpleSSLSockerServer must be running on the target host and reachable by the attacker."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "York Shen https://github.com/york-shen"
        }
      ],
      "datePublic": "2026-05-28T07:47:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
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              "type": "text/html",
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              "value": "Given that\u0026nbsp;HardenedObjectInputStream used by SimpleSocketServer and SimpleSSLSockerServer already heavily restricts the set of deserializable classes, it is unlikely that the attacker can escalate the vulnerability to gain control of the target host.\u0026nbsp;"
            }
          ],
          "value": "Given that\u00a0HardenedObjectInputStream used by SimpleSocketServer and SimpleSSLSockerServer already heavily restricts the set of deserializable classes, it is unlikely that the attacker can escalate the vulnerability to gain control of the target host."
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      "impacts": [
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          "descriptions": [
            {
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      "metrics": [
        {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "HIGH",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
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            "subConfidentialityImpact": "LOW",
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            "valueDensity": "NOT_DEFINED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
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        "shortName": "NCSC.ch"
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      "references": [
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          "url": "https://logback.qos.ch/news.html#1.5.33"
        }
      ],
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            {
              "base64": false,
              "type": "text/html",
              "value": "Upgrade to logback version 1.5.33."
            }
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      ],
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    "datePublished": "2026-05-28T12:52:45.852Z",
    "dateReserved": "2026-05-28T11:55:19.674Z",
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    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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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.

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