HTTP Response Splitting Affecting @orpc/server package, versions <1.14.8
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-ORPCSERVER-21691386
- published24 Oct 2026
- disclosed17 Sept 2026
- creditUnknown
Introduced: 17 Sep 2026
CVE-2026-77360 (opens in a new tab)How to fix?
Upgrade @orpc/server to version 1.14.8 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Response Splitting via the CORS plugin's handling of the Vary header. An attacker can manipulate cache key behavior and cause inconsistent CORS enforcement by injecting arbitrary values into the response's Vary header through crafted requests. This is only exploitable if a shared cache or reverse proxy is configured to key on the Vary header.