CVEvulnerability

CVE-2026-40036

8.7 HIGH Published 2026-04-08 Modified 2026-10-08 Official page ↗
Status
Analyzed
Published
2026-04-08
Last modified
2026-10-08
Assigner
[email protected]
CVSS 4.0 ([email protected])
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/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
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-409, CWE-770

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.

Affected configurations

• ryandfir unfurl (< 2026.04)

Related

Weakness · CWE (2)

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

References