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CVE-2021-43801

Uncaught Exception in mercurius

HIGH
7.5
CVSS Score
Published: December 13, 2021 at 07:30 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
2 products affected across 2 vendorsMercuriusProject Mercurius

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Severity
HIGH7.5
Exploit prediction
EPSS 2%

Description

Mercurius is a GraphQL adapter for Fastify. Any users from [email protected] 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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mercurius· Mercurius Projectnpm
95%
8.10.0 ≤ v < 8.11.2
Affected range stops below 8.11.2, so it looks safe — our inference, not a vendor statement
Project Mercurius· Mercurius Js
60%
v < 8.11.2
Affected range stops below 8.11.2, so it looks safe — our inference, not a vendor statement

References (3)

x_refsource_MISCIssue TrackingPatchThird Party Advisory
Source: [email protected]
https://github.com/mercurius-js/mercurius/issues/677
x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/mercurius-js/mercurius/pull/678/commits/732b2f895312da8deadd7b173dcd2d141d54b223
x_refsource_CONFIRMPatchThird Party Advisory
Source: [email protected]
https://github.com/mercurius-js/mercurius/security/advisories/GHSA-273r-rm8g-7f3x

CVSS

7.5HIGHGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-754

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