oapi-codegen: OpenAPI Server Description Escapes Generated Go Comment and Injects Executable Code

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

0.0 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

Summary The vulnerability in oapi-codegen seems to be similar with CVE-2026-22785, which is a generated-code injection issue where untrusted OpenAPI `summary` text is embedded into generated TypeScript MCP server source without proper escaping. `oapi-codegen` has a similar vulnerability in its server URL generator: untrusted OpenAPI `servers[].description` text is inserted into a generated Go line comment without normalizing embedded newlines. A crafted description can break out of the comment, add imports through `goimports`, and emit executable Go declarations into the generated package. > [!NOTE] > A vulnerability like this requires that it is missed in code review and that you then call the malicious method. > > Using an `init()` function could be enough to not require a direct call to the code, and instead rely on you importing the package, but either way, code review should be performed before any `oapi-codegen` generated code is executed. > > We strongly recommend…

Published by the source

17 Jul 2026, 18:50 UTC

Last modified by the source

30 Oct 2026, 02:57 UTC

Source last checked

30 Oct 2026, 07:05 UTC

1. Revision 2 · amended · 30 Oct 2026

   Amended from osv record GHSA-rjwr-m7qx-3fjr

2. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-rjwr-m7qx-3fjr

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# Patch Next advisory brief: GHSA-rjwr-m7qx-3fjr

Advisory: oapi-codegen: OpenAPI Server Description Escapes Generated Go Comment and Injects Executable Code
IDs: GHSA-rjwr-m7qx-3fjr
Record: https://patchnext.com/advisories/ghsa-rjwr-m7qx-3fjr (revision 2, source checked 30 Oct 2026, 07:05 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Unrated (CVSS 0.0)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/oapi-codegen/oapi-codegen/v2 2.7.1. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/oapi-codegen/oapi-codegen/v2: affected < 2.7.1; fixed in 2.7.1

## Suggested inspection (read-only)
- Go github.com/oapi-codegen/oapi-codegen/v2: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/oapi-codegen/oapi-codegen/v2.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-rjwr-m7qx-3fjr (GitHub-reviewed advisory GHSA-rjwr-m7qx-3fjr lists affected ranges: Go github.com/oapi-codegen/oapi-codegen/v2 >=0 <=2.7.0)
- Verified: https://osv.dev/vulnerability/GHSA-rjwr-m7qx-3fjr (OSV record GHSA-rjwr-m7qx-3fjr lists affected ranges: Go github.com/oapi-codegen/oapi-codegen/v2 >=0 <2.7.1 (fixed))

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