RHSA-2026:54420
Vulnerability from csaf_redhat - Published: 2026-08-12 17:43 - Updated: 2026-08-20 11:28Summary
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
Severity
Moderate
Notes
Topic: An update for Red Hat Hardened Images RPMs is now available.
Details: This update includes the following RPMs:
cosign:
* cosign-3.1.3-0.1.hum1 (aarch64, x86_64)
* cosign-3.1.3-0.1.hum1.src (src)
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in the `go-chi chi` RealIP middleware. This vulnerability allows a remote attacker to spoof their IP address by manipulating the `X-Forwarded-For` HTTP header. By exploiting this, an attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, potentially leading to unauthorized access or misattribution of actions.
6.5 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:cosign-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:cosign-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:cosign-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the go-chi/chi RealIP middleware. This vulnerability allows a remote attacker to perform IP spoofing by supplying arbitrary IP addresses in client-controlled headers. This can lead to bypassing IP-based access controls, evading rate limiting and geo-IP restrictions, and polluting audit logs.
6.5 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:cosign-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:cosign-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:cosign-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the `go-chi/chi` component. The RealIP middleware, responsible for resolving the request source IP, does not properly validate trusted proxies when processing the `X-Forwarded-For` header. A remote attacker can exploit this by prepending a forged IP address to the `X-Forwarded-For` header, leading to IP spoofing. This could allow the attacker to bypass access controls or falsify request logs.
6.5 (Medium)
Affected products
Fixed
3 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: Red Hat Hardened Images:cosign-main@aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:cosign-main@src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: Red Hat Hardened Images:cosign-main@x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
25 references
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"notes": [
{
"category": "description",
"text": "A flaw was found in the `go-chi chi` RealIP middleware. This vulnerability allows a remote attacker to spoof their IP address by manipulating the `X-Forwarded-For` HTTP header. By exploiting this, an attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, potentially leading to unauthorized access or misattribution of actions.",
"title": "Vulnerability description"
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{
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"text": "github.com/go-chi/chi/middleware: go-chi chi: IP spoofing via X-Forwarded-For header allows bypass of access controls",
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},
{
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"text": "An IP spoofing flaw exists in go-chi/chi\u0027s RealIP middleware. When parsing incoming HTTP requests, the middleware blindly trusts the leftmost IP address in the X-Forwarded-For header without verifying proxy chain trust. Remote unauthenticated attackers can supply arbitrary client IP addresses to bypass IP-based access control lists (ACLs), evade rate-limiting rules, or forge audit trail logs, posing a Low impact to confidentiality and integrity.",
"title": "Statement"
},
{
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"title": "CVSS score applicability"
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"title": "github.com/go-chi/chi/middleware: go-chi chi: IP spoofing via X-Forwarded-For header allows bypass of access controls"
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"text": "A flaw was found in the go-chi/chi RealIP middleware. This vulnerability allows a remote attacker to perform IP spoofing by supplying arbitrary IP addresses in client-controlled headers. This can lead to bypassing IP-based access controls, evading rate limiting and geo-IP restrictions, and polluting audit logs.",
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{
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"text": "An IP spoofing flaw exists in go-chi/chi\u0027s RealIP middleware (middleware/realip.go). The realIP() function parses untrusted HTTP headers (True-Client-IP, X-Real-IP, X-Forwarded-For) and overwrites r.RemoteAddr without validating upstream proxy identity. Remote unauthenticated attackers can supply arbitrary IP values in these headers to bypass IP-restricted endpoints, subvert rate-limiting controls, or poison application audit logs, posing a Low impact to confidentiality and integrity.",
"title": "Statement"
},
{
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"details": "Do not use the `chi/middleware.RealIP` middleware when receiving traffic directly from untrusted networks or unverified proxies. Instead, strip or sanitize client-supplied forwarding headers at an upstream edge proxy or reverse proxy (such as NGINX or HAProxy) before requests reach the application.",
"product_ids": [
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"scores": [
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"products": [
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"Red Hat Hardened Images:cosign-main@src",
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}
],
"title": "github.com/go-chi/chi: go-chi/chi: IP Spoofing via RealIP Middleware allows bypassing access controls"
},
{
"cve": "CVE-2026-72817",
"cwe": {
"id": "CWE-501",
"name": "Trust Boundary Violation"
},
"discovery_date": "2026-08-14T11:54:03.312526+00:00",
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{
"category": "description",
"text": "A flaw was found in the `go-chi/chi` component. The RealIP middleware, responsible for resolving the request source IP, does not properly validate trusted proxies when processing the `X-Forwarded-For` header. A remote attacker can exploit this by prepending a forged IP address to the `X-Forwarded-For` header, leading to IP spoofing. This could allow the attacker to bypass access controls or falsify request logs.",
"title": "Vulnerability description"
},
{
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"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A flaw in the go-chi/chi RealIP middleware allows remote attackers to spoof source IP addresses (`Request.RemoteAddr`). The middleware parses the first IP address in the `X-Forwarded-For` header without verifying if the immediate HTTP proxy peer is trusted. An unauthenticated attacker can prepend an arbitrary IP address to the `X-Forwarded-For` header, causing applications relying on `RealIP` for request context to misidentify the client source. This enables bypassing application-level IP-based access control lists (ACLs) or spoofing identity in audit logs.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
"fixed": [
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"Red Hat Hardened Images:cosign-main@src",
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]
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"summary": "RHBZ#2516008",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516008"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-72817",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-72817"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-72817",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72817"
},
{
"category": "external",
"summary": "https://github.com/go-chi/chi/security/advisories/GHSA-9g5q-2w5x-hmxf",
"url": "https://github.com/go-chi/chi/security/advisories/GHSA-9g5q-2w5x-hmxf"
},
{
"category": "external",
"summary": "https://www.vulncheck.com/advisories/go-chi-chi-before-ip-spoofing-via-x-forwarded-for",
"url": "https://www.vulncheck.com/advisories/go-chi-chi-before-ip-spoofing-via-x-forwarded-for"
}
],
"release_date": "2026-08-14T11:35:28.824000+00:00",
"remediations": [
{
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"date": "2026-08-12T17:43:48+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/",
"product_ids": [
"Red Hat Hardened Images:cosign-main@aarch64",
"Red Hat Hardened Images:cosign-main@src",
"Red Hat Hardened Images:cosign-main@x86_64"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:54420"
},
{
"category": "workaround",
"details": "Disable the default `RealIP` middleware and replace it with a proxy-aware middleware (such as `httputil.ReverseProxy` or custom header parsing) that strictly validates upstream reverse proxies against an explicit list of trusted CIDR ranges before accepting `X-Forwarded-For` headers.",
"product_ids": [
"Red Hat Hardened Images:cosign-main@aarch64",
"Red Hat Hardened Images:cosign-main@src",
"Red Hat Hardened Images:cosign-main@x86_64"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
"version": "3.1"
},
"products": [
"Red Hat Hardened Images:cosign-main@aarch64",
"Red Hat Hardened Images:cosign-main@src",
"Red Hat Hardened Images:cosign-main@x86_64"
]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "github.com/go-chi/chi/middleware: go-chi/chi: IP spoofing via X-Forwarded-For header manipulation"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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