6.9

CVE-2026-72815: go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header

Deferred
AliasesUBUNTU-CVE-2026-72815DEBIAN-CVE-2026-72815GHSA-3fxj-6jh8-hvhx
Published 14-08-2026Last modified 08-10-2026

Vulnerability summary

CVE-2026-72815 is a medium (CVSS 6.9) Authentication Bypass by Spoofing vulnerability in go-chi chi. EPSS estimates a 0.50% chance of exploitation in the next 30 days, higher than 42.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.50%
0%100%
Low · 0.00 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 11 · Related 8
OPENSUSE-SU-2026:11810-1OPENSUSE-SU-2026:12297-1OPENSUSE-SU-2026:21645-1OPENSUSE-SU-2026:21653-1OPENSUSE-SU-2026:21670-1OPENSUSE-SU-2026:21793-1

Timeline

  1. 14-08-2026
    PublishedVulnerability first disclosed.
  2. 08-10-2026
    Last modifiedVulnerability 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

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.50%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.50% 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

Affected systems

Version check

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

Debian1 product
  • golang-github-go-chi-chiAll versions (No fix recorded) | < 5.3.0-1
Github.com/go-chi/chi1 product
  • v5≥ 5.2.1, < 5.3.0
Github.com/go-chi/chi/v51 product
  • middleware≥ 5.2.1, < 5.3.0
Go-chi1 product
  • chi≥ 5.2.1, < 5.3.0
Opensuse1 product
  • cloudflared&distro=openSUSE Tumbleweed< 2026.8.2-1.1
Ubuntu1 product
  • golang-github-go-chi-chiAll versions (No fix recorded)

6 vendors · 6 products

References

8 links