CVE-2026-77360

MEDIUMPre-NVD 6.36.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 52% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Trending — 3 sources updated this weekElevated
6.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.3
EG Score
6.3(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity63% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
48%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 16, 2026

Advisory Details (5)

Auto-updated Sep 16, 2026
Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v1.14.8

Patch available: middleapi/orpc v1.14.8

https://github.com/middleapi/orpc/releases/tag/v1.14.8
github_commit Patch Available

commit daabded122a8 (middleapi/orpc)

Patch available: middleapi/orpc v1.14.8 (contains commit daabded122a8)

https://github.com/middleapi/orpc/commit/daabded122a89d323357c4c401e879701864cb2f
github_pr Patch Available

fix(server): stop copying request Vary into CORS responses

Patch available: middleapi/orpc v2.0.0-beta.17 (PR #1662 merged 2026-07-12)

https://github.com/middleapi/orpc/pull/1662
generic

CORS plugin copies the request Vary header into the response · Issue #1661 · middleapi/orpc · GitHub

https://github.com/middleapi/orpc/issues/1661
github Patch Available

Vary Header Injection in CORS Plugin leading to potential Cache/CORS Bypass · Advisory · middleapi/orpc · GitHub

https://github.com/middleapi/orpc/security/advisories/GHSA-j9v4-rhgr-4m5f

Vendor Advisories for CVE-2026-77360(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
@orpc/server—1.14.8—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 7× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-17 20:02 UTCEG score recompute
  3. 2026-09-16 21:00 UTCEG score recompute
  4. 2026-09-16 19:49 UTCEG score recompute
  5. 2026-09-16 19:24 UTCEG score recompute
  6. 2026-09-16 18:51 UTCEG score recompute
  7. 2026-09-16 18:49 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-77360?
CVE-2026-77360 is a medium vulnerability published on September 16, 2026. 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…
When was CVE-2026-77360 disclosed?
CVE-2026-77360 was first published in the National Vulnerability Database on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-77360 actively exploited?
CVE-2026-77360 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 51.6% of all scored CVEs.
What is the CVSS score of CVE-2026-77360?
CVE-2026-77360 has a CVSS v3 base score of 6.3 (NVD).
How do I remediate CVE-2026-77360?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-77360, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-77360

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