ZDF
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-30922

pyasn1 is a generic ASN.1 library for Python.

Published Mar 18, 2026 · catalog updated Sep 10, 2026 · pyasn1 is a generic

Check if you run it

No confirmed exploitation is on record for CVE-2026-30922. EPSS is 0.97%. Act only if a listed version of pyasn1 is a generic is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (pyasn1 is a generic).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.97%
Remediation
Advisory link
Affected products
cpe pyasn1/pyasn1

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested ( ) or ( ) tags with "Indefinite Length" ( ) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a or consumes all available memory (OOM), crashing the host application. This is a distinct vulnerability from CVE-2026-23490 (which addressed integer overflows in OID decoding). The fix for CVE-2026-23490 ( ) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe pyasn1/pyasn1version unspecified

How to fix CVE-2026-30922

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-30922. EPSS is 0.97%. Act only if a listed version of pyasn1 is a generic is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-674; CWE-835: Infinite Loop. EPSS 0.97%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 18, 2026 · NIST NVD

    Detected

    pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested ( ) or ( ) tags with "Indefinite Length" ( ) markers. This forces the decoder to recursively call itself until the

  2. Sep 10, 2026 · NIST NVD

    Updated

    pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousands of nested ( ) or ( ) tags with "Indefinite Length" ( ) markers. This forces the decoder to recursively call itself until the

Sources

  • CVE.orgVulnerability recordCVE-2026-30922

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-30922

    30-day exploitation probability 1.0%

    first.org
  • NIST NVDVulnerability recordCVE-2026-30922

    pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the library is vulnerable to a Denial of Service (DoS) attack caused by uncontrolled recursion when decoding ASN.1 data with deeply nested structures. An attacker can supply a crafted payload containing thousa

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.