CVE-2019-20393 — Double Free in Libyang

CWE-415 — Double FreeCWE-416 — Use After Free7 documents6 sources
Severity
8.8HIGHNVD
EPSS
0.3%
top 47.72%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Cesnet LibyangDebian Libyang
Timeline
PublishedJan 22
Latest updateMay 24

Description

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.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitability: 2.8 | Impact: 5.9

Affected Packages3 packages

▶debiandebian/libyang< libyang 1.0.176-1 (bullseye)
▶Debiancesnet/libyang< 1.0.176-1+2
▶NVDcesnet/libyang6 versions+5

Patches

Patch: bugzilla.redhat.com ↗Patch: github.com ↗Patch: bugzilla.redhat.com ↗

🔴Vulnerability Details

2
GHSA
GHSA-xr5g-jrq4-w3j4: A double-free is present in libyang before v1↗2022-05-24
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OSV
CVE-2019-20393: A double-free is present in libyang before v1↗2020-01-22
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📋Vendor Advisories

2
Red Hat
libyang: double-free in function yyparse() when empty description is used↗2019-03-29
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Debian
CVE-2019-20393: libyang - A double-free is present in libyang before v1.0-r1 in the function yyparse() whe...↗2019
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💬Community

2
Bugzilla
CVE-2019-20393 libyang: double-free in function yyparse() when empty description is used [fedora-all]↗2020-02-03
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Bugzilla
CVE-2019-20393 libyang: double-free in function yyparse() when empty description is used↗2020-01-22
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