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CVE details

CVE-2026-119194

pyasn1 is a generic ASN.1 library for Python. From 0.3.3 until 0.6.5, schemaless container decoding stores every decoded component's TagSet in a growing set even though only one-versus-multiple tag types must be distinguished. Attacker-controlled BER, CER, or DER input contains many distinct long tag IDs whose TagSet hashes collide. Each later set insertion compares against an increasing number of earlier colliding tags in ConstructedPayloadDecoderBase._decodeComponentsSchemaless, producing quadratic CPU work while decoded values and order remain valid. Repeated inputs can exhaust decoder CPU and reduce service availability. 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><ge>0.3.3</ge><lt>0.6.5</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>CVE-2026-119194: pyasn1 is a generic ASN.1 library for Python. From
	  0.3.3 until 0.6.5, schemaless container decoding stores every
	  decoded component's TagSet in a growing set even though only one-
	  versus-multiple tag types must be distinguished. Attacker-
	  controlled BER, CER, or DER input contains many distinct long tag
	  IDs whose TagSet hashes collide. Each later set insertion compares
	  against an increasing number of earlier colliding tags in
	  ConstructedPayloadDecoderBase._decodeComponentsSchemaless,
	  producing quadratic CPU work while decoded values and order remain
	  valid. Repeated inputs can exhaust decoder CPU and reduce service
	  availability. This issue is fixed in version 0.6.5.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-119194</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-119194</url>
    </references>
    <dates>
      <discovery>2026-10-29</discovery>
      <entry>2026-10-30</entry>
    </dates>
  </vuln>