CVE-2026-67217Public exploitNetwork attack vector

Data destruction via validation-after-detachment

Published Jul 29, 2026 · Updated Jul 29, 2026

Incorrect behavior order in cJSON through 1.7.19 allows remote attackers to delete document members via crafted JSON Patch input. apply_patch() detaches and deletes a replace or move target before validating the replacement value or resolving the destination path. Exploitation requires an application to pass attacker-controlled patches to cJSON_Utils and to trust a nonzero return as proof that the target remained unchanged.

CVSS severity6.9
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Incorrect behavior order in cJSON through 1.7.19 allows remote attackers to delete document members via crafted JSON Patch input. apply_patch() detaches and deletes a replace or move target before validating the replacement value or resolving the destination path. Exploitation requires an application to pass attacker-controlled patches to cJSON_Utils and to trust a nonzero return as proof that the target remained unchanged.

The record

CVE
CVE-2026-67217
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
cJSON Project
Product
cJSON
Classifications
CWE-696, T1565
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <=1.7.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

cJSON Project · cJSONversion=0 <=1.7.19

Published CVSS scores

5.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
6.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-696Incorrect Behavior Order
T1565Data Manipulation

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo