cvelistv5 - CVE-2025-66566

CVE-2025-66566 (GCVE-0-2025-66566)

Vulnerability from cvelistv5 – Published: 2025-12-05 18:10 – Updated: 2025-12-05 18:27

Summary

yawkat LZ4 Java provides LZ4 compression for Java. Insufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data. JNI-based implementations are not affected. This vulnerability is fixed in 1.10.1.

Severity ?

8.2 (High)


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

CWE

CWE-201 - Insertion of Sensitive Information Into Sent Data

Assigner

GitHub_M

References

URL

Tags

	https://github.com/yawkat/lz4-java/security/advis…	x_refsource_CONFIRM
	https://github.com/yawkat/lz4-java/commit/33d180c…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	yawkat	lz4-java	Affected: < 1.10.1

Show details on NVD website

JSON

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GHSA-CMP6-M4WJ-Q63Q

Vulnerability from github – Published: 2025-12-05 18:54 – Updated: 2025-12-05 18:54

Summary

yawkat LZ4 Java has a possible information leak in Java safe decompressor

Details

Summary

Insufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data.

JNI-based implementations are not affected.

Details

During the decompression process, the lz4 algorithm may have to repeat data that was previously decompressed in the same input frame. In the Java implementation, this is implemented by copy operations within the output buffer.

With a crafted input, an attacker may induce the Java implementation to copy from a region in the output buffer that does not contain decompressed data yet. If that region contains sensitive information because the output buffer was not cleared prior to decompression, that data will then be copied to the decompressed output.

LZ4Factory.nativeInstance().safeDecompressor() is not affected.
LZ4Factory.nativeInstance().fastDecompressor() is affected because it actually uses safeInstance() since 1.8.1. In 1.8.0 and earlier versions, this implementation is instead vulnerable to the more severe CVE‐2025‐12183, so downgrading is not a solution.
Both decompressors of LZ4Factory.safeInstance(), LZ4Factory.unsafeInstance() and LZ4Factory.fastestJavaInstance() are affected.
LZ4Factory.fastestInstance() uses the nativeInstance or fastestJavaInstance depending on platform. LZ4Factory.fastestInstance().fastDecompressor() is always affected, while LZ4Factory.fastestInstance().safeDecompressor() is affected only when JNI cannot be used (e.g. on unsupported platforms).

Independent of this vulnerability, it is recommended that users migrate from fastDecompressor to safeDecompressor, as the latter is more performant (despite the name).

The impact of this vulnerability depends on how user code interacts with the decompression API. Users that allocate a new destination buffer each time, or use only zeroed buffers, are not impacted. When the buffer is reused, however, the confidentiality impact can be severe. This vulnerability is marked as VC:H out of caution.

Mitigation

lz4-java 1.10.1 fixes this issue without requiring changes in user code.

If you cannot upgrade to 1.10.1, you can mitigate this vulnerability by zeroing the output buffer before passing it to the decompression function.

Relation to CVE‐2025‐12183

This CVE is a different attack than CVE‐2025‐12183, affecting different implementations with different impact. This new vulnerability was discovered by CodeIntelligence during research that followed up on CVE‐2025‐12183. Users are recommended to upgrade to 1.10.1 to fix both vulnerabilities.

Severity ?

8.2 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 1.10.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "at.yawk.lz4:lz4-java"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.10.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.lz4:lz4-java"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "1.8.1"
            }
          ],
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        }
      ]
    },
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.lz4:lz4-pure-java"
      },
      "ranges": [
        {
          "events": [
            {
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      "package": {
        "ecosystem": "Maven",
        "name": "net.jpountz.lz4:lz4"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
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              "last_affected": "1.8.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-66566"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-201"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-12-05T18:54:55Z",
    "nvd_published_at": "2025-12-05T18:15:59Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nInsufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data.\n\nJNI-based implementations are *not* affected.\n\n### Details\n\nDuring the decompression process, the lz4 algorithm may have to repeat data that was previously decompressed in the same input frame. In the Java implementation, this is implemented by copy operations within the output buffer.\n\nWith a crafted input, an attacker may induce the Java implementation to copy from a region in the output buffer that does not contain decompressed data yet. If that region contains sensitive information because the output buffer was not cleared prior to decompression, that data will then be copied to the decompressed output.\n\n- `LZ4Factory.nativeInstance().safeDecompressor()` *is not* affected.\n- `LZ4Factory.nativeInstance().fastDecompressor()` *is* affected because it actually uses `safeInstance()` since 1.8.1. In 1.8.0 and earlier versions, this implementation is instead vulnerable to the more severe [CVE\u20102025\u201012183](https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183), so downgrading is not a solution.\n- Both decompressors of `LZ4Factory.safeInstance()`, `LZ4Factory.unsafeInstance()` and `LZ4Factory.fastestJavaInstance()` are affected.\n- `LZ4Factory.fastestInstance()` uses the `nativeInstance` or `fastestJavaInstance` depending on platform. `LZ4Factory.fastestInstance().fastDecompressor()` is always affected, while `LZ4Factory.fastestInstance().safeDecompressor()` is affected only when JNI cannot be used (e.g. on unsupported platforms).\n\nIndependent of this vulnerability, it is recommended that users migrate from `fastDecompressor` to `safeDecompressor`, as the latter is more performant (despite the name).\n\nThe impact of this vulnerability depends on how user code interacts with the decompression API. Users that allocate a new destination buffer each time, or use only zeroed buffers, are not impacted. When the buffer is reused, however, the confidentiality impact can be severe. This vulnerability is marked as VC:H out of caution.\n\n### Mitigation\n\nlz4-java 1.10.1 fixes this issue without requiring changes in user code.\n\nIf you cannot upgrade to 1.10.1, you can mitigate this vulnerability by zeroing the output buffer before passing it to the decompression function.\n\n### Relation to CVE\u20102025\u201012183\n\nThis CVE is a different attack than [CVE\u20102025\u201012183](https://sites.google.com/sonatype.com/vulnerabilities/cve-2025-12183), affecting different implementations with different impact. This new vulnerability was discovered by [CodeIntelligence](https://www.code-intelligence.com/) during research that followed up on CVE\u20102025\u201012183. Users are recommended to upgrade to 1.10.1 to fix both vulnerabilities.",
  "id": "GHSA-cmp6-m4wj-q63q",
  "modified": "2025-12-05T18:54:55Z",
  "published": "2025-12-05T18:54:55Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-66566"
    },
    {
      "type": "WEB",
      "url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/yawkat/lz4-java"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "yawkat LZ4 Java has a possible information leak in Java safe decompressor"
}

FKIE_CVE-2025-66566

Vulnerability from fkie_nvd - Published: 2025-12-05 18:15 - Updated: 2025-12-08 18:26

Severity ?

8.2 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840
	security-advisories@github.com	https://github.com/yawkat/lz4-java/security/advisories/GHSA-cmp6-m4wj-q63q

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "yawkat LZ4 Java provides LZ4 compression for Java. Insufficient clearing of the output buffer in Java-based decompressor implementations in lz4-java 1.10.0 and earlier allows remote attackers to read previous buffer contents via crafted compressed input. In applications where the output buffer is reused without being cleared, this may lead to disclosure of sensitive data. JNI-based implementations are not affected. This vulnerability is fixed in 1.10.1."
    }
  ],
  "id": "CVE-2025-66566",
  "lastModified": "2025-12-08T18:26:49.133",
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          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.2,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  },
  "published": "2025-12-05T18:15:59.580",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/yawkat/lz4-java/commit/33d180cb70c4d93c80fb0dc3ab3002f457e93840"
    },
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      "source": "security-advisories@github.com",
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  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-201"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2025-66566 (GCVE-0-2025-66566)

GHSA-CMP6-M4WJ-Q63Q

Summary

Details

Mitigation

Relation to CVE‐2025‐12183

FKIE_CVE-2025-66566

Tags

Sightings

Nomenclature