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CVE details

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.

Score
8.7 high
Published
2026-08-11
Links
NVD · cve.org

Matched ports (1)

PortPackageVersionStatusMaintainer
devel/libcjsonlibcjson1.7.19_1unaddressedsunpoet@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>libcjson</name>
	<range><lt>FIXME</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>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.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-29036</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-29036</url>
    </references>
    <dates>
      <discovery>2026-08-11</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>