High severity · published Jun 26, 2026
CVE-2026-48042
Envoy: Stack overflow in destructor of highly nested JSON
7.5
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
EN
envoy · envoyproxy
>= 1.38.0, < 1.38.1; >= 1.37.0, < 1.37.3; >= 1.36.0, < 1.36.7; < 1.35.11 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48042
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-48042
Product
https://github.com/envoyproxy/envoy/blob/099a9d71ebfd8aa9f823e1738b34138cb634a07b/source/common/json/json_loader.h#L21
Exploit
https://github.com/envoyproxy/envoy/security/advisories/GHSA-f24p-rxw2-g6pv
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