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CVE-2026-59886

CVE-2026-59886 · pyasn1: Uncontrolled resource consumption when converting decoded REAL values

This page contains facts from public vulnerability sources. Check the original advisory before updating.

pyasn1 is a generic ASN.1 library for Python. Prior to 0.6.4, the univ.Real type converted its mantissa, base, and exponent value to a Python float using exact big-integer exponentiation. A BER, CER, or DER encoded REAL value only a few bytes long can carry a very large exponent, causing float conversion through prettyPrint(), str(), comparison, arithmetic, int(), or an explicit float() call to consume excessive CPU and memory and hang applications that decode untrusted ASN.1 data and then print, log, or compare decoded objects. This issue is fixed in version 0.6.4.

CVSS 7.5 · High · EPSS 0.6% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • pyasn1

    Versions
    • < 0.6.4: Affected

    No fix published

  • pyasn1 Debian:12

    Versions
    • 0.4.8-3
    • 0.4.8-3+deb12u1
    • 0.4.8-3+deb12u2
    Affected ranges
    • ECOSYSTEM: < 0.4.8-3+deb12u3

    Update to 0.4.8-3+deb12u3

  • pyasn1 Debian:13

    Versions
    • 0.6.1-1
    • 0.6.1-1+deb13u1
    • 0.6.1-1+deb13u2
    Affected ranges
    • ECOSYSTEM: < 0.6.1-1+deb13u3

    Update to 0.6.1-1+deb13u3

  • pyasn1 Debian:14

    Versions
    • 0.6.1-1
    • 0.6.2-1
    • 0.6.2-1~bpo13+1
    • 0.6.3-1
    • 0.6.4-1~bpo13+1
    Affected ranges
    • ECOSYSTEM: < 0.6.4-1

    Update to 0.6.4-1

  • pyasn1 PyPI

    Versions
    • 0.0.10a
    • 0.0.11a
    • 0.0.12a
    • 0.0.13
    • 0.0.13a
    • 0.0.13b
    • 0.0.6a
    • 0.0.9a
    • 0.1.1
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.5
    • 0.1.6
    • 0.1.7
    • 0.1.8
    • 0.1.9
    • 0.2.1
    • 0.2.2
    • 0.2.3
    • 0.3.1
    • 0.3.2
    • 0.3.3
    • 0.3.4
    • 0.3.5
    • 0.3.6
    • 0.3.7
    • 0.4.1
    • 0.4.2
    • 0.4.3
    • 0.4.4
    • 0.4.5
    • 0.4.6
    • 0.4.7
    • 0.4.8
    • 0.5.0
    • 0.5.1
    • 0.6.0
    • 0.6.1
    • 0.6.2
    • 0.6.3
    Affected ranges
    • ECOSYSTEM: < 0.6.4

    Update to 0.6.4

  • pyasn1 Ubuntu:Pro:14.04:LTS

    Versions
    • 0.1.4-0ubuntu1
    • 0.1.7-1ubuntu1
    • 0.1.7-1ubuntu2
    • 0.1.7-1ubuntu2.1
    • 0.1.7-1ubuntu2.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:Pro:16.04:LTS

    Versions
    • 0.1.8-2
    • 0.1.9-1
    • 0.1.9-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:Pro:18.04:LTS

    Versions
    • 0.1.9-2
    • 0.4.2-3
    • 0.4.2-3ubuntu0.18.04.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:Pro:20.04:LTS

    Versions
    • 0.4.2-3
    • 0.4.2-3build1
    • 0.4.2-3ubuntu0.20.04.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pyasn1 Ubuntu:22.04:LTS

    Versions
    • 0.4.8-1
    • 0.4.8-1ubuntu0.1
    • 0.4.8-1ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 0.4.8-1ubuntu0.3

    Update to 0.4.8-1ubuntu0.3

  • pyasn1 Ubuntu:24.04:LTS

    Versions
    • 0.4.8-4
    • 0.4.8-4ubuntu0.1
    • 0.4.8-4ubuntu0.2
    Affected ranges
    • ECOSYSTEM: < 0.4.8-4ubuntu0.3

    Update to 0.4.8-4ubuntu0.3

  • pyasn1 Ubuntu:26.04:LTS

    Versions
    • 0.6.1-1
    • 0.6.1-1build1
    • 0.6.2-1
    • 0.6.3-1
    Affected ranges
    • ECOSYSTEM: < 0.6.3-1ubuntu0.1

    Update to 0.6.3-1ubuntu0.1

Original sources

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