CVE-2025-47908 | Denial of service via malicious preflight requests in github.com/rs/cors

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.

Published: 2025-08-06 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-47908 is rated Moderate Risk (44.3/100): CVSS High severity, with low exploitation likelihood (EPSS 0.53%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-47908

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.38% 0.53% +0.15%
2 2026-06-02 0.05% 0.38% +0.32%
3 2025-09-07 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-47908

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-47908

GitHub Security Advisory for CVE-2025-47908

GHSA-mh55-gqvf-xfwm · Severity: medium · Ecosystem: go — Denial of service via malicious preflight requests in github.com/rs/cors

OS Trackers for CVE-2025-47908

vendor priority summary link
debian unimportant CVE-2025-47908 unimportant priority: Debian including 1 source packages (golang-github-rs-cors), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-47908
redhat medium — https://access.redhat.com/security/cve/CVE-2025-47908
suse medium — https://www.suse.com/security/cve/CVE-2025-47908/
ubuntu medium CVE-2025-47908 medium priority: Ubuntu including 1 source packages (golang-github-rs-cors), 6 status rows across 6 suites (focal, jammy, noble, plucky, questing, upstream): needs-triage 5, ignored 1. https://ubuntu.com/security/CVE-2025-47908

Affected software / configurations for CVE-2025-47908

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-47908

cvelogic Threat Intelligence