CVE-2026-47770Public exploit

Process crash via unbounded structural-comparison recursion

Published Jun 25, 2026 · Updated Jun 25, 2026

Uncontrolled recursion in jqlang jq before 1.8.2 allows attackers to crash the process by comparing deeply nested arrays with ==. In src/jv.c, jvp_array_equal() repeatedly calls jv_equal() for nested elements without a depth guard, exhausting the C stack; jv_cmp() has the same flaw on a deeper sort path. Reachability requires attacker-controlled JSON to reach equality or comparison logic, and the demonstrated consequence is process termination without memory corruption or code execution.

CVSS severity6.8
Medium
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled recursion in jqlang jq before 1.8.2 allows attackers to crash the process by comparing deeply nested arrays with ==. In src/jv.c, jvp_array_equal() repeatedly calls jv_equal() for nested elements without a depth guard, exhausting the C stack; jv_cmp() has the same flaw on a deeper sort path. Reachability requires attacker-controlled JSON to reach equality or comparison logic, and the demonstrated consequence is process termination without memory corruption or code execution.

The record

CVE
CVE-2026-47770
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
jqlang
Product
jq
Classifications
CWE-674, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.8.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

jqlang · jqversion=< 1.8.2

Published CVSS scores

6.8GitHubCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-674Uncontrolled Recursion
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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