CVE-2026-48042

Envoy: Stack overflow in destructor of highly nested JSON

HIGH

7.5

CVSS Score

Published: June 26, 2026 at 05:29 PM UTC

Updated: October 25, 2026 at 05:10 PM UTC

1 product affected across 1 vendorEnvoy

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Severity

HIGH7.5

Exploit prediction

EPSS 0.6%

SSVC

PoC

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.35.11, 1.36.7, 1.37.3, and 1.38.1, destructor of JSON Object results in stack overflow when deeply O(100K) nested objects are present. This vulnerability is fixed in 1.35.11, 1.36.7, 1.37.3, and 1.38.1.

Affected

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

Envoy · Envoyproxy

95%

1.18.0 ≤ v < 1.35.131.36.0 ≤ v < 1.36.91.37.0 ≤ v < 1.37.51.38.0 ≤ v < 1.38.3

Affected range stops below 1.35.11, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.35.13, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.36.7, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.36.9, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.37.3, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.37.5, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.38.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.38.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://github.com/envoyproxy/envoy/security/advisories/GHSA-f24p-rxw2-g6pv

References (2)

x_refsource_CONFIRMExploitVendor Advisory

Source: cverecord

https://github.com/envoyproxy/envoy/security/advisories/GHSA-f24p-rxw2-g6pv

x_refsource_MISCProduct

Source: cverecord

https://github.com/envoyproxy/envoy/blob/099a9d71ebfd8aa9f823e1738b34138cb634a07b/source/common/json/json_loader.h#L21

SSVC — Action Prioritization

SSVCPoCAutomatablePartial 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

StatusANALYZED

CWE

CWE-1124

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