go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header (CVE-2026-72815) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-72815

go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header

Answer in brief

CVE-2026-72815 records a Medium severity (CVSS 6.9) vulnerability in go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header. The current sources do not mark it as known exploited. The current feed maps go-chi/chi (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 14, 2026Updated Aug 18, 2026Source checked Sep 29, 2026First seen by HOL Aug 14, 2026Material review Aug 18, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps go-chi/chi (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
go-chi/chigeneric	>=5.2.1 <5.3.0	5.3.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for go-chi/chi.
Review the reported fix. Update go-chi/chi to 5.3.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 14, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 14, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.