CVE-2026-72817

Aliases:DEBIAN-CVE-2026-72817GHSA-9g5q-2w5x-hmxfGO-2026-5775UBUNTU-CVE-2026-72817openSUSE-SU-2026:11578-1openSUSE-SU-2026:11591-1
Advisory lineage Upstream: 0 Downstream: 9
Deferred
Published: 14 Aug 2026, 11:35
Last modified:17 Aug 2026, 16:09

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
6.9 MEDIUM
v4.0 (cve.org)
EPSS Score
0.15% 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
17 Aug 2026, 16:09
Last Modified
Vulnerability information updated

Description

go-chi/chi versions 0.9.0 before 5.3.0 contains an IP spoofing vulnerability in the RealIP middleware, which resolves the request source IP (Request.RemoteAddr) using the first IP in the X-Forwarded-For header without validating trusted proxies. A malicious client can prepend a forged IP as the first value of the X-Forwarded-For header to spoof the request source IP, potentially bypassing access controls or falsifying request logs.

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
  • v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P
  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS Trends

Current EPSS score: 0.15%• Percentile: 5%

Techniques & Countermeasures

  • CWE-345•Insufficient Verification of Data Authenticity

    The product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.

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

    ≥ 0.9.0, < 5.3.0

  • github.com/go-chi/chi•middleware

    ≥ 0.9.0, ≤ 1.5.5

  • github.com/go-chi/chi•v5

    < 5.3.0

  • github.com/go-chi/chi/v2•middleware

    ≤ 2.1.1

  • github.com/go-chi/chi/v3•middleware

    ≤ 3.3.5

  • github.com/go-chi/chi/v4•middleware

    ≤ 4.1.3

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

    < 5.3.0

  • opensuse•trivy&distro=openSUSE Tumbleweed

    < 0.74.0-1.1

  • opensuse•v2ray-core&distro=openSUSE Tumbleweed

    < 5.53.0-1.1

References (9)