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CVE details

CVE-2026-67215

cJSON through 1.7.19 is vulnerable to uncontrolled recursion leading to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied via cJSONUtils_ApplyPatches() or cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and copy operations grafts duplicated subtrees to amplify document depth beyond the parser's nesting limit: cJSON_Delete() recurses with no depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is set to 10000, ten times the parser's 1000-level nesting limit and high enough to overflow a default thread stack. An attacker who can supply the patch document can crash the process, resulting in denial of service.

Score
8.7 high
Published
2026-07-29
Links
NVD · cve.org · Report wrong data

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 through 1.7.19 is vulnerable to uncontrolled recursion leading
	to stack exhaustion when an untrusted RFC 6902 JSON Patch is applied
	via cJSONUtils_ApplyPatches() or
	cJSONUtils_ApplyPatchesCaseSensitive(). A patch containing add and
	copy operations grafts duplicated subtrees to amplify document depth
	beyond the parser's nesting limit: cJSON_Delete() recurses with no
	depth bound, and the cJSON_Duplicate() guard CJSON_CIRCULAR_LIMIT is
	set to 10000, ten times the parser's 1000-level nesting limit and high
	enough to overflow a default thread stack. An attacker who can supply
	the patch document can crash the process, resulting in denial of
	service.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-67215</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-67215</url>
    </references>
    <dates>
      <discovery>2026-07-29</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>