CVE-2026-72815

Aliases:DEBIAN-CVE-2026-72815GHSA-3fxj-6jh8-hvhxGO-2026-5774UBUNTU-CVE-2026-72815openSUSE-SU-2026:11607-1
Advisory lineage Upstream: 0 Downstream: 9
Received
Published: 14 Aug 2026, 11:35
Last modified:18 Aug 2026, 01:55

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
6.9 MEDIUM
v4.0 (cve.org)
EPSS Score
0.4% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

14 Aug 2026, 11:35
Published
Vulnerability first disclosed
18 Aug 2026, 01:55
Last Modified
Vulnerability information updated

Description

go-chi chi versions >= 5.2.1 and before 5.3.0 contain an IP spoofing vulnerability in the RealIP middleware, which blindly trusts the first (leftmost) value of the X-Forwarded-For HTTP header. A remote attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, by supplying a spoofed IP address in the X-Forwarded-For header. The issue is fixed in version 5.3.0.

CVSS Metrics

  • v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
  • v4.0•MEDIUM•Score: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Trends

Current EPSS score: 0.40%• Percentile: 34%

Techniques & Countermeasures

  • CWE-290•Authentication Bypass by Spoofing

    This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

Affected Systems

  • debian•golang-github-go-chi-chi

    all | all | all | < 5.3.0-1

  • ubuntu•golang-github-go-chi-chi

    all | all | all

  • go-chi•chi

    ≥ 5.2.1, < 5.3.0

  • github.com/go-chi/chi•v5

    ≥ 5.2.1, < 5.3.0

  • github.com/go-chi/chi/v5•middleware

    ≥ 5.2.1, < 5.3.0

  • opensuse•cloudflared&distro=openSUSE Tumbleweed

    < 2026.8.2-1.1

References (8)