CVE-2024-34363

Envoy can crash due to uncaught nlohmann JSON exception

HIGH

7.5

CVSS Score

Published: June 4, 2024 at 08:59 PM UTC

Updated: June 17, 2026 at 07:33 AM UTC

1 product affected across 1 vendorEnvoy

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Severity

HIGH7.5

Exploit prediction

EPSS 0.7%

SSVC

No known exploit

Description

Envoy is a cloud-native, open source edge and service proxy. Due to how Envoy invoked the nlohmann JSON library, the library could throw an uncaught exception from downstream data if incomplete UTF-8 strings were serialized. The uncaught exception would cause Envoy to crash.

Affected

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

Envoy · Envoyproxy

95%

v ≤ 1.28.3v ≤ 1.29.4v ≤ 11.30.11.28.0 ≤ v < 1.28.41.29.0 ≤ v < 1.29.51.30.0 ≤ v < 1.30.2

Affected range stops below 1.28.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.29.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.30.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_CONFIRMExploitThird Party Advisory

Source: [email protected]

https://github.com/envoyproxy/envoy/security/advisories/GHSA-g979-ph9j-5gg4

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

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-248NVD-CWE-Other

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