High 7.5Published Oct 24, 2026

CVE-2026-116011Crow before 1.3.4 Denial of Service via Deeply Nested JSON in crow::json::load()

Updated under an hour ago (Oct 28, 2026, 6:50 PM ET)

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It affects CrowCpp Crow. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.68%, higher than 52% of scored CVEs.

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-674
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.68% (percentile 52)
Assigned by: VulnCheck
NVD analysis: Awaiting Analysis
Record last updated: Oct 26, 2026
First seen by InfoSec Signals: Oct 24, 2026

Affected products

Affected products

CrowCpp Crow crowcpp:crow (from the name)	before 1.3.4	CNA record

References

References

https://github.com/CrowCpp/Crow/security/advisories/GHSA-7x84-xhp8-6cqj	vendor-advisory
https://github.com/CrowCpp/Crow/commit/6956b7ca93c5df22f5aaccd670e5aa000c0d882b	patch
https://github.com/CrowCpp/Crow/releases/tag/v1.3.4	release-notes
https://github.com/CrowCpp/Crow/blob/v1.3.3/include/crow/json.h#L878	technical-description
https://www.vulncheck.com/advisories/crow-before-1.3.4-denial-of-service-via-deeply-nested-json-in-crow-json-load	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.