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Public proof of conceptFix available

CVE-2026-67217

A public proof of concept exists; no exploitation attested.

  • Published2026-07-29
  • WeaknessCWE-696

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

cJSON through 1.7.19 applies RFC 6902 JSON Patch operations non-atomically in apply_patch() in cJSON_Utils.c. For a replace operation that is missing its value member, or a move operation whose destination path cannot be resolved, the existing target member is detached and deleted before the operation is fully validated, so the target document is mutated while cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() returns a failure status. An attacker who can supply the patch document can destroy addressable members of the target document even though the API reports that the patch failed, defeating the all-or-nothing behavior callers rely on to reject bad patches.

Timeline

dates in UTC
  1. 2026-07-2914:16CVE publishedNVD

Versions per branch

NVD
Davegamble cjson
BranchAffectedFixed in
1.7≤ 1.7.19no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As VulnCheck, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • DaveGamble cJSONother versions: affected
    Affected
    • ≤ 1.7.19no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-07-29

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cjsonUbuntu:Pro:24.04:LTSall versions · no fixed version listed
  • cjsonUbuntu:Pro:22.04:LTSall versions · no fixed version listed
  • cjsonUbuntu:Pro:20.04:LTSall versions · no fixed version listed
  • cjsonUbuntu:26.10all versions · no fixed version listed
  • cjsonUbuntu:26.04:LTSall versions · no fixed version listed
  • cjsonDebian:14all versions · no fixed version listed
  • cjsonDebian:13all versions · no fixed version listed
  • cjsonDebian:12all versions · no fixed version listed

Vendor advisories

  • CVE-2026-67217 Red Hat Product Security

    cJSON: cJSON: Data destruction due to non-atomic JSON Patch application

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-24
  • CISA-ADPSSVC decisionpoc2026-07-29
  • CNACVSS 4.06.9known since 2026-10-24
  • CNACVSS 3.15.3known since 2026-10-24
  • CNAweakness (CWE)CWE-696known since 2026-10-24
  • FIRST EPSSEPSS score0.4 %2026-11-09
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-07-29
Last Modified
2026-10-23
NVD status
Analyzed
GitHub Advisory
GHSA-pr46-97qf-f32c

Frequently asked questions

What is CVE-2026-67217?

cJSON through 1.7.19 applies RFC 6902 JSON Patch operations non-atomically in apply_patch() in cJSON_Utils.c. For a replace operation that is missing its value member, or a move operation whose destination path cannot be resolved, the existing target member is detached and deleted before the operation is fully validated, so the target document is mutated while cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() returns a failure status. An attacker who can supply the patch document can destroy addressable members of the target document even though the API reports that the patch failed, defeating the all-or-nothing behavior callers rely on to reject bad patches.

Is CVE-2026-67217 actively exploited?

A proof-of-concept exploit exists for CVE-2026-67217, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-67217?

CVE-2026-67217 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

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