DEBIAN-CVE-2026-119197

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    DEBIAN-CVE-2026-119197

    Published: 29 Oct 2026Last Modified: 3 Nov 2026
    Upstream:
    CVE-2026-119197

    Summary:

    Details: 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.

    References: https://security-tracker.debian.org/tracker/CVE-2026-119197

    Affected packages

    Package

    Name: pyasn1

    Purl: pkg:deb/debian/pyasn1?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    0.4.8-3
    0.4.8-3+deb12u1
    0.4.8-3+deb12u2
    0.4.8-3+deb12u3
    0.4.8-4

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    DEBIAN-CVE-2026-119197 | CVE-DB