7.5

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

Deferred
AliasesSUSE-SU-2025:4481-1UBUNTU-CVE-2025-47908CGA-2pxr-7p5m-7mch
Published 06-08-2025Last modified 07-08-2025

Vulnerability summary

CVE-2025-47908 is a high (CVSS 7.5) vulnerability in github.com/rs/cors. EPSS estimates a 0.63% chance of exploitation in the next 30 days, higher than 50.3% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.63%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 6
OPENSUSE-SU-2025:15424-1OPENSUSE-SU-2026:21136-1SUSE-SU-2025:3817-1SUSE-SU-2025:3819-1SUSE-SU-2025:4457-1CGA-GCMV-PXRJ-3X4W

Timeline

  1. 06-08-2025
    PublishedVulnerability first disclosed.
  2. 07-08-2025
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.63%

Chance of exploitation in the next 30 days

Percentile

50%

Versus all other CVEs

30-day change

Increase +0.06 pp

From 0.57% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard24 products
  • argo-cd-2.11< 2.11.4-r2
  • cortex< 1.17.1-r4
  • cortex-fips< 1.17.1-r6
  • fulcio< 1.4.5-r7
  • fulcio-fips< 1.4.5-r8
Wolfi12 products
  • cortex< 1.17.1-r4
  • fulcio< 1.4.5-r7
  • grafana-mimir< 2.13.0-r1
  • prometheus-alertmanager< 0.27.0-r8
  • prometheus-alertmanager-iamguarded-compat< 0.27.0-r8
Suse4 products
  • golang-github-prometheus-alertmanager&distro=SUSE Linux Enterprise Module for Package Hub 15 SP6< 0.28.1-150100.4.28.2
  • golang-github-prometheus-alertmanager&distro=SUSE Linux Enterprise Module for Package Hub 15 SP7< 0.28.1-150100.4.28.2
  • golang-github-prometheus-alertmanager&distro=SUSE Manager Client Tools 15< 0.28.1-150100.4.28.2
  • golang-github-prometheus-alertmanager&distro=SUSE Manager Proxy LTS 4.3< 0.28.1-150100.4.28.2
Github.com/rs1 product
  • cors≥ 1.9.0, < 1.11.0
Github.com/rs/cors1 product
Opensuse1 product
  • golang-github-prometheus-alertmanager&distro=openSUSE Leap 15.6< 0.28.1-150100.4.28.2
Ubuntu1 product
  • golang-github-rs-corsAll versions (No fix recorded)

7 vendors · 44 products

References

13 links
Show all 13 references