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CVE details

CVE-2026-119197

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, binary REAL decoding builds a large mantissa one octet at a time by shifting a growing integer and slicing the remaining byte string. Attacker-controlled ASN.1 includes a binary-encoded REAL with a large mantissa and reaches BER, CER, or DER decode(), with or without a schema containing REAL. RealPayloadDecoder.valueDecoder repeatedly performs a left shift, OR, and suffix copy for every mantissa octet, making decode time quadratic in mantissa length. A comparatively small REAL value can hold a decoding worker on one CPU core for seconds or longer and cause availability loss. This issue is fixed in version 0.6.5.

Score
7.5 high
Published
2026-10-29
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
devel/py-pyasn1py312-pyasn10.6.4unaddressedmhjacks@swbell.net

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Ranges per package from the CVE rows that match this port, in pkg notation with the port's epoch and revision, every bound checked with pkg; one range per epoch the port actually had. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>py312-pyasn1 -- FIXME</topic>
    <affects>
      <package>
	<name>py312-pyasn1</name>
	<range><lt>0.6.5</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>CVE-2026-119197: pyasn1 is a generic ASN.1 library for Python. Prior
	  to 0.6.5, binary REAL decoding builds a large mantissa one octet at
	  a time by shifting a growing integer and slicing the remaining byte
	  string. Attacker-controlled ASN.1 includes a binary-encoded REAL
	  with a large mantissa and reaches BER, CER, or DER decode(), with
	  or without a schema containing REAL.
	  RealPayloadDecoder.valueDecoder repeatedly performs a left shift,
	  OR, and suffix copy for every mantissa octet, making decode time
	  quadratic in mantissa length. A comparatively small REAL value can
	  hold a decoding worker on one CPU core for seconds or longer and
	  cause availability loss. This issue is fixed in version 0.6.5.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-119197</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-119197</url>
    </references>
    <dates>
      <discovery>2026-10-29</discovery>
      <entry>2026-10-30</entry>
    </dates>
  </vuln>