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Vulnerabilities

Vulnerability · CVE-2025-47908

Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value cont

Published Aug 6, 2025 · catalog updated Aug 7, 2025 · Middleware causes a prohibitive

Last checked Oct 23, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-47908. EPSS is 0.60%. Act only if a listed version of Middleware causes a prohibitive is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Middleware causes a prohibitive).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.60%
Remediation
Version ranges on file
Affected products
vendor github.com/rs/cors github.com/rs/cors 1.9.0 <1.11.0

Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor github.com/rs/cors github.com/rs/cors 1.9.0 <1.11.01.9.0 <1.11.0

How to fix CVE-2025-47908

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-47908. EPSS is 0.60%. Act only if a listed version of Middleware causes a prohibitive is installed.

Which versions are affected?

Compare what you have installed with github.com/rs/cors github.com/rs/cors 1.9.0 <1.11.0 1.9.0 <1.11.0. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.60%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 6, 2025 · EUVD

    Detected

    Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.

  2. Aug 7, 2025 · EUVD

    Updated

    Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/server as an attempt to cause a denial of service.

Sources

  • CVE.orgVulnerability recordCVE-2025-47908

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-47908

    30-day exploitation probability 0.60%

    first.org
  • EUVDVulnerability recordEUVD-2025-23882

    Middleware causes a prohibitive amount of heap allocations when processing malicious preflight requests that include a Access-Control-Request-Headers (ACRH) header whose value contains many commas. This behavior can be abused by attackers to produce undue load on the middleware/s

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 23, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 23, 2026
  • CVE.orgOct 21, 2026
  • EUVDOct 20, 2026