CVE-2025-71381

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-07-01. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

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

Hono before 4.10.2 (fixed in 4.10.3) contains a flaw in its CORS middleware: when the origin is not set to "*", the middleware copies the Vary header from the incoming request into the response. Because Vary is a response header that should be managed by the server, an attacker can supply arbitrary Vary values that are reflected into the response, potentially causing cache key pollution and inconsistent CORS enforcement in environments that rely on shared caches or proxies.

CVSS v3
6.5
EG Score
6.5(high)
EPSS
19.8%
KEV
Not listed

Published

June 30, 2026

Last Modified

July 2, 2026

Advisory Details (2)

Auto-updated Jul 1, 2026
Patch available. Sources: github.
generic

Hono - Vary Header Injection in CORS Middleware | Advisories | VulnCheck

https://www.vulncheck.com/advisories/hono-vary-header-injection-in-cors-middleware
github Patch Available

Vary Header Injection leading to potential CORS Bypass · Advisory · honojs/hono · GitHub

https://github.com/honojs/hono/security/advisories/GHSA-q7jf-gf43-6x6p

Vendor Advisories for CVE-2025-71381(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 21× in last 7d / 21× 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. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 15:50 UTCEG score recompute
  3. 2026-07-06 15:50 UTCGHSA enrichment
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-05 17:05 UTCEG score recompute
  6. 2026-07-05 17:05 UTCGHSA enrichment
  7. 2026-07-05 02:30 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 18:21 UTCEG score recompute
  10. 2026-07-04 18:21 UTCGHSA enrichment
  11. 2026-07-04 06:31 UTCEPSS rescore
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-03 19:37 UTCEG score recompute
  14. 2026-07-03 19:37 UTCGHSA enrichment
  15. 2026-07-02 20:54 UTCEG score recompute
  16. 2026-07-02 20:54 UTCGHSA enrichment
  17. 2026-07-01 22:12 UTCEG score recompute
  18. 2026-07-01 22:11 UTCGHSA enrichment
  19. 2026-07-01 15:06 UTCEPSS rescore
  20. 2026-06-30 23:24 UTCEG score recompute
  21. 2026-06-30 23:23 UTCNVD updatefirst tracked

Frequently asked(5)

What is CVE-2025-71381?
CVE-2025-71381 is a medium vulnerability published on June 30, 2026. Hono before 4.10.2 (fixed in 4.10.3) contains a flaw in its CORS middleware: when the origin is not set to "*", the middleware copies the Vary header from the incoming request into the response. Because Vary is a response header that should be managed by the server, an attacker can supply arbitrary…
When was CVE-2025-71381 disclosed?
CVE-2025-71381 was first published in the National Vulnerability Database on June 30, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-71381 actively exploited?
CVE-2025-71381 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-71381?
CVE-2025-71381 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2025-71381?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-71381, 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

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