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VulnerabilityPublished

CVE-2026-59884: pyasn1 vulnerabilities

Affects pyasn1Source GCVE Database

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Mentioned vulnerabilities

Not known to be exploited · fixed in 0.1.7-1ubuntu2.1+esm2 : patch pyasn1 soon.

Data as of 10 Nov 2026, 03:50 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch
Available – fixed in 0.1.7-1ubuntu2.1+esm2, 0.1.9-1ubuntu0.1~esm2, 0.4.2-3ubuntu0.18.04.1~esm2 +5

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 9 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 9 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
Ubuntu 26.10pyasn1pkg:deb/ubuntu/pyasn1?arch=source&distro=stonkingOther threatsAffected
  • <0.6.4-1ubuntu0.1
Fixed in
  • 0.6.4-1ubuntu0.1
Ubuntu 26.04 LTSpyasn1pkg:deb/ubuntu/pyasn1?arch=source&distro=resoluteOther threatsAffected
  • <0.6.3-1ubuntu0.2
Fixed in
  • 0.6.3-1ubuntu0.2
Ubuntu 24.04 LTSpyasn1pkg:deb/ubuntu/pyasn1?arch=source&distro=nobleOther threatsAffected
  • <0.4.8-4ubuntu0.4
Fixed in
  • 0.4.8-4ubuntu0.4
Ubuntu 22.04 LTSpyasn1pkg:deb/ubuntu/pyasn1?arch=source&distro=jammyOther threatsAffected
  • <0.4.8-1ubuntu0.4
Fixed in
  • 0.4.8-1ubuntu0.4
Ubuntu Pro 20.04 LTSpyasn1pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra/focalOther threatsAffected
  • <0.4.2-3ubuntu0.20.04.1~esm2
Fixed in
  • 0.4.2-3ubuntu0.20.04.1~esm2
Ubuntu Pro 18.04 LTSpyasn1pkg:deb/ubuntu/pyasn1?arch=source&distro=esm-infra/bionicOther threatsAffected
  • <0.4.2-3ubuntu0.18.04.1~esm2
Fixed in
  • 0.4.2-3ubuntu0.18.04.1~esm2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Fixes for these vulnerabilities are available in updated pyasn1 package versions for affected Ubuntu releases. Users should apply the security updates referenced in Ubuntu Security Notice USN-9011-1 and upgrade to the fixed versions: 0.1.7-1ubuntu2.1+esm2, 0.1.9-1ubuntu0.1~esm2, 0.4.2-3ubuntu0.18.04.1~esm2, 0.4.2-3ubuntu0.20.04.1~esm2, 0.4.8-1ubuntu0.4, 0.4.8-4ubuntu0.4, 0.6.4-1ubuntu0.1, or 0.6.3-1ubuntu0.2. Applying these patches mitigates the risk of denial of service.

Description

Multiple vulnerabilities in the pyasn1 library affect various Ubuntu LTS releases, allowing denial of service via excessive CPU or memory consumption when decoding untrusted ASN.1 data. These issues include improper bounding of long-form tag identifiers, quadratic time processing of OBJECT IDENTIFIER and RELATIVE-OID values, incorrect REAL value conversions, and inefficient handling of fragmented constructed strings and BIT STRING values. The vulnerabilities impact Ubuntu 14.04 LTS through 26.10, with fixes available in updated package versions.

References

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