High severity · published Oct 24, 2026
CVE-2026-116011
Crow before 1.3.4 Denial of Service via Deeply Nested JSON in crow::json::load()
New
7.5
CVSS
0.7%
EPSS
No
On KEV
Description
Crow before 1.3.4 contains an uncontrolled recursion vulnerability in crow::json::load() that allows remote unauthenticated attackers to crash the server by sending deeply nested JSON. Attackers can send a request body with thousands of nested objects to exhaust the worker thread stack, terminating the process and dropping all connections.
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)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CR
Crow · CrowCpp
before 1.3.4 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116011
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116011
github.com
https://github.com/CrowCpp/Crow/blob/v1.3.3/include/crow/json.h#L878
github.com
https://github.com/CrowCpp/Crow/commit/6956b7ca93c5df22f5aaccd670e5aa000c0d882b
github.com
https://github.com/CrowCpp/Crow/releases/tag/v1.3.4
github.com
https://github.com/CrowCpp/Crow/security/advisories/GHSA-7x84-xhp8-6cqj
www.vulncheck.com
https://www.vulncheck.com/advisories/crow-before-1.3.4-denial-of-service-via-deeply-nested-json-in-crow-json-load
More from Crow
9.8
CVE-2022-38667
HTTP applications (servers) based on Crow through 1.0+4 may allow a Use-After-Free and code execution when HTTP pipelining is used
9.8
CVE-2022-34970
Crow before 1.0+4 has a heap-based buffer overflow via the function qs_parse in query_string.h
7.5
CVE-2022-38668
HTTP applications (servers) based on Crow through 1.0+4 may reveal potentially sensitive uninitialized data from stack memory when fulfilling a request for a static file smaller…
7.5
CVE-2021-23514
This affects the package Crow before 0.3+4
6.1
CVE-2023-26142
All versions of the package crow are vulnerable to HTTP Response Splitting when untrusted user input is used to build header values