CVE-2019-20396 — Improper Restriction of Operations within the Bounds of a Memory Buffer in Libyang

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory BufferCWE-125 — Out-of-bounds ReadCWE-20 — Improper Input Validation7 documents6 sources
Severity
6.5MEDIUMNVD
EPSS
0.3%
top 51.01%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Cesnet LibyangDebian Libyang
Timeline
PublishedJan 22
Latest updateMay 24

Description

A segmentation fault is present in yyparse in libyang before v1.0-r1 due to a malformed pattern statement value during lys_parse_path parsing.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HExploitability: 2.8 | Impact: 3.6

Affected Packages3 packages

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

Patches

Patch: github.com ↗Patch: github.com ↗

🔴Vulnerability Details

2
GHSA
GHSA-8wpf-h467-qvv5: A segmentation fault is present in yyparse in libyang before v1↗2022-05-24
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OSV
CVE-2019-20396: A segmentation fault is present in yyparse in libyang before v1↗2020-01-22
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📋Vendor Advisories

2
Red Hat
libyang: heap-based buffer over-read in function lys_type_free() due to malformed pattern↗2019-03-29
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Debian
CVE-2019-20396: libyang - A segmentation fault is present in yyparse in libyang before v1.0-r1 due to a ma...↗2019
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💬Community

2
Bugzilla
CVE-2019-20396 libyang: heap-based buffer over-read in function lys_type_free() due to malformed pattern [fedora-all]↗2020-02-03
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Bugzilla
CVE-2019-20396 libyang: heap-based buffer over-read in function lys_type_free() due to malformed pattern↗2020-01-22
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