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    2 vulnerabilities by pyasn1

    CVE-2026-30922 (GCVE-0-2026-30922)

    Vulnerability from cvelistv5 – Published: 2026-03-18 02:29 – Updated: 2026-05-01 16:21
    VLAI
    Title
    pyasn1 Vulnerable to Denial of Service via Unbounded Recursion
    Summary
    pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.3, the `pyasn1` 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 `SEQUENCE` (`0x30`) or `SET` (`0x31`) tags with "Indefinite Length" (`0x80`) markers. This forces the decoder to recursively call itself until the Python interpreter crashes with a `RecursionError` 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 (`MAX_OID_ARC_CONTINUATION_OCTETS`) does not mitigate this recursion issue. Version 0.6.3 fixes this specific issue.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    pyasn1 pyasn1 Affected: < 0.6.3
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-23490 (GCVE-0-2026-23490)

    Vulnerability from cvelistv5 – Published: 2026-01-16 19:03 – Updated: 2026-02-01 17:06
    VLAI
    Title
    pyasn1 has a DoS vulnerability in decoder
    Summary
    pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.2, a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets. This vulnerability is fixed in 0.6.2.
    Severity
    7.5 (High)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: poc Automatable: yes Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-770 - Allocation of Resources Without Limits or Throttling
    Assigner
    References
    Impacted products
    Vendor Product Version
    pyasn1 pyasn1 Affected: < 0.6.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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