Vulnerability-Lookup

GHSA-C776-5V2H-X5J5

Vulnerability from github – Published: 2026-09-30 15:31 – Updated: 2026-09-30 15:31

Details

A vulnerability was determined in Blosc C-Blosc2 up to 3.3.2. This impacts the function blosclz_decompress of the file blosc/blosclz.c of the component blosclz Decompression. Executing a manipulation can lead to integer overflow. The attack may be launched remotely. A high complexity level is associated with this attack. The exploitability is said to be difficult. Upgrading to version 3.3.3 will fix this issue. This patch is called fe2964d114d97847f56570a0ab2be2c57ccbeedc. The affected component should be upgraded.

Severity

5.6 (Medium)


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

6.3 (Medium)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-103222"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-30T15:22:25Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability was determined in Blosc C-Blosc2 up to 3.3.2. This impacts the function blosclz_decompress of the file blosc/blosclz.c of the component blosclz Decompression. Executing a manipulation can lead to integer overflow. The attack may be launched remotely. A high complexity level is associated with this attack. The exploitability is said to be difficult. Upgrading to version 3.3.3 will fix this issue. This patch is called fe2964d114d97847f56570a0ab2be2c57ccbeedc. The affected component should be upgraded.",
  "id": "GHSA-c776-5v2h-x5j5",
  "modified": "2026-09-30T15:31:33Z",
  "published": "2026-09-30T15:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103222"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Blosc/c-blosc2/commit/fe2964d114d97847f56570a0ab2be2c57ccbeedc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Blosc/c-blosc2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Blosc/c-blosc2/releases/tag/v3.3.3"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/cve/CVE-2026-103222"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/954976"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/411905"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/411905/cti"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/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",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-103222 (GCVE-0-2026-103222)

Vulnerability from cvelistv5 – Published: 2026-09-30 14:00 – Updated: 2026-09-30 16:26 X_Open Source

Title

Blosc C-Blosc2 blosclz Decompression blosclz.c blosclz_decompress integer overflow

Summary

Severity

6.3 (Medium)


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

5.6 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

5.6 (Medium)


                        
                          CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L/E:X/RL:O/RC:C

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-30 16:25 UTC

CWE

CWE-190 - Integer Overflow
CWE-189 - Numeric Error

Assigner

VulDB mitre root Scorecard

References

7 references

URL	Tags
https://vuldb.com/vuln/411905	vdb-entrytechnical-description
https://vuldb.com/vuln/411905/cti	signaturepermissions-required
https://vuldb.com/cve/CVE-2026-103222	third-party-advisory
https://vuldb.com/submit/954976	third-party-advisory
https://github.com/Blosc/c-blosc2/commit/fe2964d1…	patch
https://github.com/Blosc/c-blosc2/releases/tag/v3.3.3	patch
https://github.com/Blosc/c-blosc2/	product

Impacted products

1 product

Vendor	Product	Version
Blosc	C-Blosc2	Affected: 3.3.0 Affected: 3.3.1 Affected: 3.3.2 Unaffected: 3.3.3 cpe:2.3:a:blosc:c-blosc2::::::::

Credits

zzxzzb (VulDB User)

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JSON

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{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-103222",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-30T16:25:43.440256Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
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    ],
    "cna": {
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            "cpe:2.3:a:blosc:c-blosc2:*:*:*:*:*:*:*:*"
          ],
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            "blosclz Decompression"
          ],
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          "vendor": "Blosc",
          "versions": [
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              "status": "affected",
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            },
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            },
            {
              "status": "affected",
              "version": "3.3.2"
            },
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              "status": "unaffected",
              "version": "3.3.3"
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        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was determined in Blosc C-Blosc2 up to 3.3.2. This impacts the function blosclz_decompress of the file blosc/blosclz.c of the component blosclz Decompression. Executing a manipulation can lead to integer overflow. The attack may be launched remotely. A high complexity level is associated with this attack. The exploitability is said to be difficult. Upgrading to version 3.3.3 will fix this issue. This patch is called fe2964d114d97847f56570a0ab2be2c57ccbeedc. The affected component should be upgraded."
        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X",
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            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 5.6,
            "baseSeverity": "MEDIUM",
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            "version": "3.0"
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        },
        {
          "cvssV2_0": {
            "baseScore": 5.1,
            "vectorString": "AV:N/AC:H/Au:N/C:P/I:P/A:P/E:ND/RL:OF/RC:C",
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      "providerMetadata": {
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      },
      "references": [
        {
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          "tags": [
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          ],
          "url": "https://vuldb.com/vuln/411905"
        },
        {
          "name": "VDB-411905 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/411905/cti"
        },
        {
          "name": "CVE-2026-103222 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-103222"
        },
        {
          "name": "Submit #954976 | Blosc c-blosc2 \u003e= 2.0.0, \u003c fix commit fe2964d114d9 Memory Corruption",
          "tags": [
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          "time": "2026-09-30T02:00:00.000Z",
          "value": "VulDB entry created"
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          "lang": "en",
          "time": "2026-09-30T09:30:19.000Z",
          "value": "VulDB entry last update"
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      ],
      "title": "Blosc C-Blosc2 blosclz Decompression blosclz.c blosclz_decompress integer overflow",
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    "dateReserved": "2026-09-30T07:25:13.598Z",
    "dateUpdated": "2026-09-30T16:26:42.244Z",
    "state": "PUBLISHED"
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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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GHSA-C776-5V2H-X5J5

CVE-2026-103222 (GCVE-0-2026-103222)

Tags

Sightings

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