CVE-2019-20393

mediumpriority · track · 36EPSS 0.028 · 87 %ileEURUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
2.84% (87th) EPSS
CVSS 6.8 · medium
Is it mine?
36 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · fstec_bdu · nvd

EPSS · scored 2026-10-28

A double-free is present in libyang before v1.0-r1 in the function yyparse() when an empty description is used. Applications that use libyang to parse untrusted input yang files may be vulnerable to this flaw, which would cause a crash or potentially code execution.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedlibyang-0:1.0.184-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-0:1.0.184-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-0:1.0.184-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-0:1.0.184-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-0:1.0.184-1.el8.src as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-0:1.0.184-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-cpp-debuginfo-0:1.0.184-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-cpp-debuginfo-0:1.0.184-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-cpp-debuginfo-0:1.0.184-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-cpp-debuginfo-0:1.0.184-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-cpp-debuginfo-0:1.0.184-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debuginfo-0:1.0.184-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debuginfo-0:1.0.184-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debuginfo-0:1.0.184-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debuginfo-0:1.0.184-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debuginfo-0:1.0.184-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debugsource-0:1.0.184-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debugsource-0:1.0.184-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debugsource-0:1.0.184-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debugsource-0:1.0.184-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedlibyang-debugsource-0:1.0.184-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedpython3-libyang-debuginfo-0:1.0.184-1.el8.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedpython3-libyang-debuginfo-0:1.0.184-1.el8.i686 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedpython3-libyang-debuginfo-0:1.0.184-1.el8.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedpython3-libyang-debuginfo-0:1.0.184-1.el8.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
  • Fixedpython3-libyang-debuginfo-0:1.0.184-1.el8.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHEA-2021:1906
02

cvss

Technical severity, 0–10. One row per scoring source.

8.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 6.8–8.8

v2.06.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8.6 · impact 6.4
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9
v3.18.8highAV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.18.1highCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.17highCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-415USprimaryCWE-415USCWE-416US
04

affected products (36)

Products and version ranges known to be affected.

showing 20 of 36
05

advisories (1)

Vendor and ecosystem advisories describing this.

  • RHEA-2021:1906Red Hat Enhancement Advisory: libyang bug fix and enhancement update2021-05-18csaf · redhat_csafUS

    An update for libyang is now available for Red Hat Enterprise Linux 8.

06

also known as (4)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bdunvdredhat_csafNVDCVE.orgMITRE
published 2020-01-22modified 2026-06-17
09

references (18)

External citations — patches, advisories, analysis.

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