What’s Vulnerable › Vulnerabilities

CVE-2026-77360: oRPC: Vary Header Injection in CORS Plugin leading to potential Cache/CORS Bypass

• Severity: medium (CVSS 6.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-09-30
• Weakness: CWE-113

Description

oRPC is an tool that helps build APIs that are end-to-end type-safe and adhere to OpenAPI standards. Prior to 1.14.8, the @orpc/server CORS plugin in packages/server/src/plugins/cors.ts copies a client's incoming Vary request header into the response instead of controlling Vary as a response-only header and using Origin for request-origin variation. In deployments behind a shared cache, CDN, or reverse proxy that keys responses using Vary, a client can inject arbitrary variation values, pollute cache keys, and cause inconsistent CORS enforcement for other clients. Default non-cached configurations have no established direct confidentiality, integrity, or availability impact. This issue is fixed in version 1.14.8.

Affected products

• middleapi orpc: before 1.14.8

References

• https://github.com/middleapi/orpc/commit/daabded122a89d323357c4c401e879701864cb2f
• https://github.com/middleapi/orpc/issues/1661
• https://github.com/middleapi/orpc/pull/1662
• https://github.com/middleapi/orpc/releases/tag/v1.14.8
• https://github.com/middleapi/orpc/security/advisories/GHSA-j9v4-rhgr-4m5f
• https://github.com/middleapi/orpc/issues/1661

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