Vulnerability-Lookup

FKIE_CVE-2026-47321

Vulnerability from fkie_nvd - Published: 2026-09-21 08:16 - Updated: 2026-09-21 19:17

Severity

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

Summary

The CompressionFilter class uses ZLib to deflate and inflate data sent and received. When we inflate incoming data, the filter does not control the resulting size, and create a buffer no matter what. Some compressed data may have a compression ration greater than 1 thousand, leading to an exhaustion of the application memory, as we don't control the deflated size. The fix adds such a control by allowing the application developer to provide a fixed size limit, which when reached throws an exception. It also allows the user to provide a compression ratio that should not be exceeded, protected the application from small inflated files that inflate in gigantic files, but with a grace limit for the resulting size (1Mb) to avoid false positive (like a very small file inflating with a high ratio, but resulting with a acceptable size, like a few thousands bytes) For application using this feature, it is highly recommended to create the CompressionFilter and to pass the maximum limit as a forth constructor parameter, maxDecompressedSize: public CompressionFilter(final boolean compressInbound, final boolean compressOutbound, final int compressionLevel, final int maxDecompressedSize)Optionally one can also provide a maxDecompressRatio fifth parameter, and a decompressRatioMinSize sixth parameter to allow small inflated files with a high compression ratio to still be accepted. Here are the additional constructor: public CompressionFilter(final boolean compressInbound, final boolean compressOutbound, final int compressionLevel, final int maxDecompressedSize, final long maxDecompressRatio, final long decompressRatioMinSize) Also note that a fluent API has been added to spare the users the pain to call a constructor with that many parameters: CompressionFilter compressionFilter = new CompressionFilter() .setCompressionLevel(Zlib.COMPRESSION_MAX) .setMaxDecompressedSize(1_000_000) .setMaxDecompressRatio(100). .setDecompressRatioMinSize(100_000); Applications using Apache MINA are advised to upgrade and configure their CompressionFilter instance.

References

	URL	Tags
	security@apache.org	https://lists.apache.org/thread/y7xj1bl8qo47p9bktb11hg5v6k1d4dyj
	af854a3a-2127-422b-91ae-364da2661108	http://www.openwall.com/lists/oss-security/2026/09/21/1

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.mina:mina-filter-compression",
          "product": "Apache MINA",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "2.2.8",
              "status": "affected",
              "version": "2.2.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2.1.13",
              "status": "affected",
              "version": "2.1.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2.0.29",
              "status": "affected",
              "version": "2.0.0",
              "versionType": "maven"
            }
          ]
        }
      ],
      "source": "security@apache.org"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "The CompressionFilter class uses ZLib to deflate and inflate data sent and received. When we inflate incoming data, the filter does not control the resulting size, and create a buffer no matter what.\n\nSome compressed data may have a compression ration greater than 1 thousand, leading to an exhaustion of the application memory, as we don\u0027t control the deflated size.\n\n\n\n\nThe fix adds such a control by allowing the application developer to provide a fixed size limit, which when reached throws an exception. It also allows the user to provide a compression ratio that should not be exceeded, protected the application from small inflated files that inflate in gigantic files, but with a grace limit for the resulting size (1Mb) to avoid false positive (like a very small file inflating with a high ratio, but resulting with a acceptable size, like a few thousands bytes)\n\n\n\n\nFor application using this feature, it is highly recommended to create the\u00a0CompressionFilter and to pass the maximum limit as a forth constructor parameter, maxDecompressedSize:\n\n\n\n\npublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound, final int compressionLevel, final int maxDecompressedSize)Optionally one can also provide a\u00a0maxDecompressRatio\u00a0fifth parameter, and a decompressRatioMinSize\u00a0sixth parameter to allow small inflated files with a high compression ratio to still be accepted.\n\n\n\n\nHere are the additional constructor:\n\n\n\n\n\n\npublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound,\n\n\n\n            final int compressionLevel, final int maxDecompressedSize,\n\n\n\n            final long maxDecompressRatio, final long decompressRatioMinSize)\n\n\n\n\n\n\n\n\nAlso note that a fluent API has been added to spare the users the pain to call a constructor with that many parameters:\n\n\n\n\n\n\n\u2003CompressionFilter compressionFilter = new CompressionFilter()\n\n\u2003\u2003\u2003                                             .setCompressionLevel(Zlib.COMPRESSION_MAX)\n\n\u00a0                                               .setMaxDecompressedSize(1_000_000)\n\n\u00a0                                               .setMaxDecompressRatio(100).\n\n\u00a0                                               .setDecompressRatioMinSize(100_000);\u00a0\n\n\n\n\n\n\n\n\n\nApplications using Apache MINA are advised to upgrade and configure their CompressionFilter instance."
    }
  ],
  "id": "CVE-2026-47321",
  "lastModified": "2026-09-21T19:17:06.247",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "security@apache.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-47321",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-09-21T14:00:30.976651Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-09-21T08:16:37.520",
  "references": [
    {
      "source": "security@apache.org",
      "url": "https://lists.apache.org/thread/y7xj1bl8qo47p9bktb11hg5v6k1d4dyj"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "http://www.openwall.com/lists/oss-security/2026/09/21/1"
    }
  ],
  "sourceIdentifier": "security@apache.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-409"
        },
        {
          "lang": "en",
          "value": "CWE-789"
        }
      ],
      "source": "security@apache.org",
      "type": "Secondary"
    }
  ]
}

CVE-2026-47321 (GCVE-0-2026-47321)

Vulnerability from cvelistv5 – Published: 2026-09-21 07:43 – Updated: 2026-09-21 18:09

Title

Apache MINA: Unbounded Decompression Amplification DoS in Zlib.inflate

Summary

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 14:00 UTC

CWE

CWE-409 - Improper Handling of Highly Compressed Data — Data Amplification
CWE-789 - Memory Allocation with Excessive Size Value

Assigner

apache mitre root

References

2 references

URL	Tags
https://lists.apache.org/thread/y7xj1bl8qo47p9bkt…	mailing-listvendor-advisory
http://www.openwall.com/lists/oss-security/2026/09/21/1

Impacted products

1 product

Vendor	Product	Version
Apache Software Foundation	Apache MINA	Affected: 2.2.0 , < 2.2.8 (maven) Affected: 2.1.0 , < 2.1.13 (maven) Affected: 2.0.0 , < 2.0.29 (maven)

Credits

Venkatraman Kumar, SecurIn

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-47321",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-21T14:00:30.976651Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-21T14:00:48.113Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2026-09-21T18:09:30.104Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "http://www.openwall.com/lists/oss-security/2026/09/21/1"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://repo.maven.apache.org/maven2",
          "defaultStatus": "unaffected",
          "packageName": "org.apache.mina:mina-filter-compression",
          "product": "Apache MINA",
          "vendor": "Apache Software Foundation",
          "versions": [
            {
              "lessThan": "2.2.8",
              "status": "affected",
              "version": "2.2.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2.1.13",
              "status": "affected",
              "version": "2.1.0",
              "versionType": "maven"
            },
            {
              "lessThan": "2.0.29",
              "status": "affected",
              "version": "2.0.0",
              "versionType": "maven"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Venkatraman Kumar, SecurIn"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
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              "value": "\u003cdiv\u003eThe CompressionFilter class uses ZLib to deflate and inflate data sent and received. When we inflate incoming data, the filter does not control the resulting size, and create a buffer no matter what.\u003c/div\u003e\u003cdiv\u003eSome compressed data may have a compression ration greater than 1 thousand, leading to an exhaustion of the application memory, as we don\u0027t control the deflated size.\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eThe fix adds such a control by allowing the application developer to provide a fixed size limit, which when reached throws an exception. It also allows the user to provide a compression ratio that should not be exceeded, protected the application from small inflated files that inflate in gigantic files, but with a grace limit for the resulting size (1Mb) to avoid false positive (like a very small file inflating with a high ratio, but resulting with a acceptable size, like a few thousands bytes)\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eFor application using this feature, it is highly recommended to create the\u0026nbsp;CompressionFilter and to pass the maximum limit as a forth constructor parameter, maxDecompressedSize:\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cblockquote\u003epublic \u003cspan\u003eCompressionFilter\u003c/span\u003e(final boolean compressInbound, final boolean compressOutbound, final int compressionLevel, final int maxDecompressedSize)\u003c/blockquote\u003e\u003cdiv\u003eOptionally one can also provide a\u0026nbsp;\u003cspan\u003e\u003cspan\u003e\u003cspan\u003emaxDecompressRatio\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u0026nbsp;fifth parameter, and a \u003cspan\u003e\u003cspan\u003e\u003cspan\u003edecompressRatioMinSize\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e\u0026nbsp;sixth parameter to allow small inflated files with a high compression ratio to still be accepted.\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eHere are the additional constructor:\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cblockquote\u003e\u003cp\u003epublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound,\u003c/p\u003e\u003cp\u003e            final int compressionLevel, final int maxDecompressedSize,\u003c/p\u003e\u003cp\u003e            final long maxDecompressRatio, final long \u003cspan\u003edecompressRatioMinSize\u003c/span\u003e)\u003c/p\u003e\u003c/blockquote\u003e\u003c/div\u003e\u003c/div\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003eAlso note that a fluent API has been added to spare the users the pain to call a constructor with that many parameters:\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\u003c/div\u003e\u003cblockquote\u003e\u003cdiv\u003e\u2003CompressionFilter compressionFilter = new CompressionFilter()\u003c/div\u003e\u003cdiv\u003e\u2003\u2003\u2003                                             .setCompressionLevel(Zlib.\u003cspan\u003e\u003cspan\u003e\u003cspan\u003eCOMPRESSION_MAX\u003c/span\u003e\u003c/span\u003e\u003c/span\u003e)\u003c/div\u003e\u003cdiv\u003e\u0026nbsp;                                               .\u003cspan\u003e\u003cspan\u003esetMaxDecompressedSize\u003c/span\u003e\u003c/span\u003e(1_000_000)\u003c/div\u003e\u003cdiv\u003e\u0026nbsp;                                               .\u003cspan\u003e\u003cspan\u003esetMaxDecompressRatio\u003c/span\u003e\u003c/span\u003e(100).\u003c/div\u003e\u003cdiv\u003e\u0026nbsp;                                               .\u003cspan\u003e\u003cspan\u003esetDecompressRatioMinSize\u003c/span\u003e\u003c/span\u003e(100_000);\u0026nbsp;\u003c/div\u003e\u003cdiv\u003e\u003c/div\u003e\u003c/blockquote\u003e\u003cdiv\u003e\u003c/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c/div\u003e\u003cdiv\u003e\nApplications using Apache MINA are advised to upgrade and configure their CompressionFilter instance.\u003c/div\u003e"
            }
          ],
          "value": "The CompressionFilter class uses ZLib to deflate and inflate data sent and received. When we inflate incoming data, the filter does not control the resulting size, and create a buffer no matter what.\n\nSome compressed data may have a compression ration greater than 1 thousand, leading to an exhaustion of the application memory, as we don\u0027t control the deflated size.\n\n\n\n\nThe fix adds such a control by allowing the application developer to provide a fixed size limit, which when reached throws an exception. It also allows the user to provide a compression ratio that should not be exceeded, protected the application from small inflated files that inflate in gigantic files, but with a grace limit for the resulting size (1Mb) to avoid false positive (like a very small file inflating with a high ratio, but resulting with a acceptable size, like a few thousands bytes)\n\n\n\n\nFor application using this feature, it is highly recommended to create the\u00a0CompressionFilter and to pass the maximum limit as a forth constructor parameter, maxDecompressedSize:\n\n\n\n\npublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound, final int compressionLevel, final int maxDecompressedSize)Optionally one can also provide a\u00a0maxDecompressRatio\u00a0fifth parameter, and a decompressRatioMinSize\u00a0sixth parameter to allow small inflated files with a high compression ratio to still be accepted.\n\n\n\n\nHere are the additional constructor:\n\n\n\n\n\n\npublic CompressionFilter(final boolean compressInbound, final boolean compressOutbound,\n\n\n\n            final int compressionLevel, final int maxDecompressedSize,\n\n\n\n            final long maxDecompressRatio, final long decompressRatioMinSize)\n\n\n\n\n\n\n\n\nAlso note that a fluent API has been added to spare the users the pain to call a constructor with that many parameters:\n\n\n\n\n\n\n\u2003CompressionFilter compressionFilter = new CompressionFilter()\n\n\u2003\u2003\u2003                                             .setCompressionLevel(Zlib.COMPRESSION_MAX)\n\n\u00a0                                               .setMaxDecompressedSize(1_000_000)\n\n\u00a0                                               .setMaxDecompressRatio(100).\n\n\u00a0                                               .setDecompressRatioMinSize(100_000);\u00a0\n\n\n\n\n\n\n\n\n\nApplications using Apache MINA are advised to upgrade and configure their CompressionFilter instance."
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    "datePublished": "2026-09-21T07:43:24.769Z",
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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.

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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FKIE_CVE-2026-47321

CVE-2026-47321 (GCVE-0-2026-47321)

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