What’s Vulnerable › Vulnerabilities

CVE-2019-20396

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-22 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• CESNET libyang: 0.11-r1, 0.11-r2, 0.12-r1, 0.12-r2, 0.13-r1, 0.13-r2 (+5)

References

• https://github.com/CESNET/libyang/commit/a1f17693904ed6fecc8902c747fc50a8f20e6af8
• https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1
• https://github.com/CESNET/libyang/issues/740
• https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html
• https://github.com/CESNET/libyang/commit/a1f17693904ed6fecc8902c747fc50a8f20e6af8
• https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1
• https://github.com/CESNET/libyang/issues/740
• https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

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