DEBIAN-CVE-2026-119196

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    DEBIAN-CVE-2026-119196

    Published: 29 Oct 2026Last Modified: 4 Nov 2026
    Upstream:
    CVE-2026-119196

    Summary:

    Details: pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.5, constructed BIT STRING decoding repeatedly shifts and copies the complete bit value accumulated from earlier fragments. Attacker-controlled BER or CER input contains many constructed BIT STRING fragments; schema-driven DER also accepts a definite-length constructed BIT STRING. BitStringPayloadDecoder repeatedly calls BitString.fromOctetString with the prior bitString as prepend, shifting an ever-growing SizedInteger for each fragment and causing quadratic work. Large fragmented values can exhaust CPU during decode() without requiring later conversion or formatting. This issue is fixed in version 0.6.5.

    References: https://security-tracker.debian.org/tracker/CVE-2026-119196

    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-2026-119196 | CVE-DB