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CVE details

CVE-2026-129115

JSON::XS versions from 3.0 before 4.05 for Perl read freed stack memory when a FREEZE result's serialisation grows the Perl stack under allow_tags in encode_rv. With allow_tags, an object's FREEZE method is called in list context and each returned value is encoded through a saved Perl stack pointer. When encoding a returned value calls back into Perl, through TO_JSON under convert_blessed or another FREEZE, and that callback grows the stack, the stack is reallocated while the saved pointer still refers to the freed block. Encoding such objects reads freed memory, and encode can return undef without an error.

Score
–
Published
2026-11-14
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
converters/p5-JSON-XSp5-JSON-XS4.04unaddressedsunpoet@FreeBSD.org

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No CPE in the port Makefile

converters/p5-JSON-XS (CPE matched by the package name) has no USES=cpe. The CVE was matched through a CPE from another source, so the package and the version range may belong to a different product. Check the CVE record before using this entry.

  <vuln vid="FIXME (make newentry)">
    <topic>p5-JSON-XS -- FIXME</topic>
    <affects>
      <package>
	<name>p5-JSON-XS</name>
	<range><ge>3.0</ge><lt>4.05</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>CVE-2026-129115: JSON::XS versions from 3.0 before 4.05 for Perl read
	  freed stack memory when a FREEZE result's serialisation grows the
	  Perl stack under allow_tags in encode_rv. With allow_tags, an
	  object's FREEZE method is called in list context and each returned
	  value is encoded through a saved Perl stack pointer. When encoding
	  a returned value calls back into Perl, through TO_JSON under
	  convert_blessed or another FREEZE, and that callback grows the
	  stack, the stack is reallocated while the saved pointer still
	  refers to the freed block. Encoding such objects reads freed
	  memory, and encode can return undef without an error.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-129115</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-129115</url>
    </references>
    <dates>
      <discovery>2026-11-14</discovery>
      <entry>2026-11-15</entry>
    </dates>
  </vuln>