Vulnerability-Lookup

GHSA-C3F2-QG8V-25Q2

Vulnerability from github – Published: 2026-04-09 00:31 – Updated: 2026-04-10 17:18

Summary

Duplicate Advisory: Unfurl's unbounded zlib decompression allows decompression bomb DoS

Details

Duplicate Advisory

This advisory has been withdrawn because it is a duplicate of GHSA-h5qv-qjv4-pc5m. This link is maintained to preserve external references.

Original Description

Unfurl before 2026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.

Severity ?

7.5 (High)


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

8.7 (High)


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

Show details on source website

JSON

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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "dfir-unfurl"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2026.04"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [],
  "database_specific": {
    "cwe_ids": [
      "CWE-409"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-10T17:18:31Z",
    "nvd_published_at": "2026-04-08T22:16:24Z",
    "severity": "HIGH"
  },
  "details": "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-h5qv-qjv4-pc5m. This link is maintained to preserve external references.\n\n### Original Description\nUnfurl before\u00a02026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.",
  "id": "GHSA-c3f2-qg8v-25q2",
  "modified": "2026-04-10T17:18:31Z",
  "published": "2026-04-09T00:31:59Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40036"
    },
    {
      "type": "WEB",
      "url": "https://github.com/RyanDFIR/unfurl/pull/243"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/RyanDFIR/unfurl"
    },
    {
      "type": "WEB",
      "url": "https://github.com/RyanDFIR/unfurl/releases/tag/v2026.04"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/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"
    }
  ],
  "summary": "Duplicate Advisory: Unfurl\u0027s unbounded zlib decompression allows decompression bomb DoS",
  "withdrawn": "2026-04-10T17:18:31Z"
}

CVE-2026-40036 (GCVE-0-2026-40036)

Vulnerability from cvelistv5 – Published: 2026-04-08 21:35 – Updated: 2026-04-11 03:05

Title

Unfurl < 2026.04 - Denial of Service via Unbounded zlib Decompression

Summary

Severity ?

8.7 (High)


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

7.5 (High)


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

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling
CWE-409 - Improper Handling of Highly Compressed Data (Data Amplification)

Assigner

VulnCheck

References

URL

Tags

	https://github.com/obsidianforensics/unfurl/secur…	vendor-advisory
	https://github.com/obsidianforensics/unfurl/relea…	release-notespatch
	https://www.vulncheck.com/advisories/dfir-unfurl-…	third-party-advisory

Impacted products

	Vendor	Product	Version
	obsidianforensics	unfurl	Affected: 0 , < 2026.04 (semver)

Date Public ?

2026-01-28 00:00

Credits

Mobasi Security Team

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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                  },
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                  },
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                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-11T03:05:38.819397Z",
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        }
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      "metrics": [
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        {
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      "providerMetadata": {
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    "datePublished": "2026-04-08T21:35:28.460Z",
    "dateReserved": "2026-04-08T13:39:22.099Z",
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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.

Detection rules are retrieved from Rulezet.

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