High · CVSS 8.7CVE-2026-116011

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

Answer in brief

CVE-2026-116011 records a High severity (CVSS 8.7) vulnerability in Crow before 1.3.4 Denial of Service via Deeply Nested JSON in crow::json::load(). The current sources do not mark it as known exploited. The current feed maps CrowCpp/Crow (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 24, 2026Updated Oct 24, 2026Source checked Oct 24, 2026First seen by HOL Oct 24, 2026Material review Oct 24, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps CrowCpp/Crow (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
CrowCpp/Crowgeneric	>=0 <1.3.4	1.3.4

Recommended response

Check inventory. Check lockfiles and deployed manifests for CrowCpp/Crow.
Review the reported fix. Update CrowCpp/Crow to 1.3.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 24, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.