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No exploitation reportedAwaiting NVD analysis

CVE-2026-29036

No exploitation reported by the sources we read.

  • Published2026-08-11
  • WeaknessCWE-706

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 versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.

Timeline

dates in UTC
  1. 2026-08-1122:17CVE publishedNVD

Versions per branch

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
    • ≥ 1.5.0, ≤ 1.7.19no fix statedcustom

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-08-14

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
  • cjsonEchoall versions · fixed in 1.7.18-3.1+deb13u1+e2
  • cjsonDebian:14all versions · no fixed version listed
  • cjsonDebian:13all versions · no fixed version listed

1 more package range on OSV.dev

Vendor advisories

  • CVE-2026-29036 Red Hat Product Security1 known affected

    cJSON: cJSON: Data corruption and unauthorized modification via JSON Pointer escape decoding

    cjson.src as a component of Red Hat Satellite 6

Full record on NVD

Fix

  1. No fix available, says the vendor Red Hat Product Security CVE-2026-29036 · 1 productAffected

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 decisionnone2026-08-13
  • CNACVSS 4.08.7known since 2026-10-24
  • CNACVSS 3.17.5known since 2026-10-24
  • CNAweakness (CWE)CWE-706known 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:H/A:N
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/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
2026-08-11
Last Modified
2026-10-23
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-89cr-7g9x-rjgw

Frequently asked questions

What is CVE-2026-29036?

cJSON versions 1.5.0 through 1.7.19 contain an incorrectly-resolved name or reference vulnerability in the decode_pointer_inplace() function within cJSON_Utils.c that allows unauthenticated attackers to cause JSON Patch operations to target wrong object keys by supplying crafted JSON Pointer escape sequences (~0 or ~1) in patch paths. Attackers can submit malicious RFC 6902 JSON Patch input to applications using cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive() to silently corrupt data or delete unintended keys, potentially bypassing authorization controls in applications that rely on JSON Patch for access-controlled data modification.

Is CVE-2026-29036 actively exploited?

Active exploitation of CVE-2026-29036 has not been confirmed. Its EPSS score was 0.4% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-29036?

CVE-2026-29036 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

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