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CVE-2026-40036

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.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:eb8c47a86b823d3036dcfd5cb6fdeb3e4dca58a019ac6894bbbc94a4ad079623
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
2

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"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:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/metrics/0/cvssV4_0

{"metric":{"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"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/metrics/1/cvssV3_1
cwe · 2 assertions

{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-409","description":"Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/problemTypes/0/descriptions/1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageName":"dfir-unfurl","packageURL":"pkg:github/obsidianforensics/unfurl","product":"unfurl","repo":"https://github.com/obsidianforensics/unfurl","vendor":"obsidianforensics","versions":[{"lessThan":"2026.04","status":"affected","version":"0","versionType":"custom"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","exploitMaturity":"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:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/metrics/0/cvssV4_0
{"metric":{"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"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/metrics/1/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-770","description":"Allocation of Resources Without Limits or Throttling","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-409","description":"Improper Handling of Highly Compressed Data (Data Amplification)","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/problemTypes/0/descriptions/1

Source references

3 source assertions
{"name":"VulnCheck Advisory: dfir-unfurl - Denial of Service via Unbounded zlib Decompression","tags":["release-notes","patch"],"url":"https://github.com/obsidianforensics/unfurl/releases/tag/v2026.04"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/references/1
{"name":"GHSA Advisory GHSA-h5qv-qjv4-pc5m","tags":["vendor-advisory"],"url":"https://github.com/obsidianforensics/unfurl/security/advisories/GHSA-h5qv-qjv4-pc5m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/references/0
{"tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/dfir-unfurl-denial-of-service-via-unbounded-zlib-decompression"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:a34e61d7c9a3fb9148e5090e2a3518d4b2a4d8511d94dc5ae125a88d67ae3ced · sha256:bb96cbdac0af3175… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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