CVE-2021-43801

HIGH
Published Dec 13, 20214y ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Dec 13, 2021 4y ago
Last Modified Jun 17, 2026 2w ago

Description

Mercurius is a GraphQL adapter for Fastify. Any users from Mercurius@8.10.0 to 8.11.1 are subjected to a denial of service attack by sending a malformed JSON to `/graphql` unless they are using a custom error handler. The vulnerability has been fixed in https://github.com/mercurius-js/mercurius/pull/678 and shipped as v8.11.2. As a workaround users may use a custom error handler.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

No active exploitation signals — not in CISA KEV and no EPSS score yet.

Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-754

Affected Products 1

VendorProductVersionRange
mercurius_projectmercurius*≥8.10.0  –  <8.11.2

References 3

  • github.com https://github.com/mercurius-js/mercurius/issues/677
    Issue TrackingPatchThird Party Advisory
  • github.com https://github.com/mercurius-js/mercurius/pull/678/commits/732b2f895312da8deadd7b173dcd2d141d54b223
    PatchThird Party Advisory
  • github.com https://github.com/mercurius-js/mercurius/security/advisories/GHSA-273r-rm8g-7f3x
    PatchThird Party Advisory

Remediation

  • github.com https://github.com/mercurius-js/mercurius/issues/677
    Issue TrackingPatchThird Party Advisory
  • github.com https://github.com/mercurius-js/mercurius/pull/678/commits/732b2f895312da8deadd7b173dcd2d141d54b223
    PatchThird Party Advisory
  • github.com https://github.com/mercurius-js/mercurius/security/advisories/GHSA-273r-rm8g-7f3x
    PatchThird Party Advisory