Vulnerability-Lookup

GHSA-J8F8-FRC5-VGC6

Vulnerability from github – Published: 2026-05-15 09:31 – Updated: 2026-05-15 09:31

Details

SzafirHost verifies the signature of the downloaded JAR file using class JarInputStream (reading from the beginning of the file), but loads classes using class JarFile/URLClassLoader (reading the Central Directory from the end). It can lead to remote code execution by allowing an attacker to combine a genuine, signed JAR file with a malicious ZIP file, causing the verification to pass but the malicious class to be loaded.

This issue was fixed in version 1.2.1.

Severity

8.6 (High)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-44088"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-434"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-15T09:16:16Z",
    "severity": "HIGH"
  },
  "details": "SzafirHost verifies the signature of the downloaded JAR file using class JarInputStream (reading from the beginning of the file), but loads classes using class JarFile/URLClassLoader (reading the Central Directory from the end). It can lead to remote code execution by allowing an attacker to combine a genuine, signed JAR file with a malicious ZIP file, causing the verification to pass but the malicious class to be loaded.\n\n\nThis issue was fixed in version 1.2.1.",
  "id": "GHSA-j8f8-frc5-vgc6",
  "modified": "2026-05-15T09:31:32Z",
  "published": "2026-05-15T09:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44088"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/posts/2026/05/CVE-2026-44088"
    },
    {
      "type": "WEB",
      "url": "https://www.elektronicznypodpis.pl"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/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-2026-44088 (GCVE-0-2026-44088)

Vulnerability from cvelistv5 – Published: 2026-05-15 08:48 – Updated: 2026-05-15 11:07

Title

Remote Code Execution in SzafirHost

Summary

Severity

8.6 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-15 11:07 UTC

CWE

CWE-434 - Unrestricted Upload of File with Dangerous Type

Assigner

CERT-PL ENISA root Scorecard

References

2 references

URL	Tags
https://cert.pl/posts/2026/05/CVE-2026-44088	third-party-advisory
https://www.elektronicznypodpis.pl/	product

Impacted products

1 product

Vendor	Product	Version
Krajowa Izba Rozliczeniowa	SzafirHost	Affected: 0 , < 1.2.1 (semver)

Credits

Mariusz Maik

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-44088",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-15T11:07:43.075751Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-15T11:07:58.948Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "SzafirHost",
          "vendor": "Krajowa Izba Rozliczeniowa",
          "versions": [
            {
              "lessThan": "1.2.1",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Mariusz Maik"
        }
      ],
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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            }
          ],
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      ],
      "metrics": [
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          "cvssV4_0": {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "valueDensity": "NOT_DEFINED",
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        "dateUpdated": "2026-05-15T08:48:11.694Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
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      "references": [
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          "tags": [
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          ],
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        },
        {
          "tags": [
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          ],
          "url": "https://www.elektronicznypodpis.pl/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "title": "Remote Code Execution in SzafirHost",
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    "dateReserved": "2026-05-05T09:40:05.100Z",
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    "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.

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.

Action not permitted

GHSA-J8F8-FRC5-VGC6

CVE-2026-44088 (GCVE-0-2026-44088)

Tags

Sightings

Nomenclature

Related by attack behaviour