RHSA-2026:71543
Vulnerability from csaf_redhat - Published: 2026-09-24 12:11 - Updated: 2026-09-29 00:17Summary
Red Hat Security Advisory: cockpit-image-builder security update
Severity
Important
Notes
Topic: An update for cockpit-image-builder is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The image-builder-frontend generates custom images suitable for deploying systems or uploading to the cloud. It integrates into Cockpit as a frontend for osbuild.
Security Fix(es):
* fast-uri: fast-uri: Server-Side Request Forgery via repeated hostname percent-decoding (CVE-2026-75899)
* fast-uri: fast-uri: Server-side request forgery via malformed IPv6 normalization (CVE-2026-75975)
* fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects (CVE-2026-76172)
* fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization (CVE-2026-84292)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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 fast-uri, a URI parser for Node.js. The component incorrectly decodes percent escapes in a hostname twice during URI parsing and authority recomposition. This double decoding can allow a remote attacker to manipulate a URI to point to a different network destination, such as a loopback address. This vulnerability can lead to Server-Side Request Forgery (SSRF) and bypass host-based security policies.
7.5 (High)
Affected products
Threats
Impact
Important
A flaw was found in fast-uri, a URI parser for Node.js. Its custom parser for bracketed IPv6 literals does not fully validate the IPv6 grammar, allowing invalid trailing text in an authority to be silently discarded. This can lead to a malformed, attacker-controlled host being normalized into a different, valid IPv6 destination, such as a local or private IPv6 target. An application normalizing untrusted URLs before outbound requests, redirects, or proxy routing could be redirected, resulting in a server-side request forgery (SSRF) and address-policy bypass.
7.5 (High)
Affected products
Fixed
2 products, the same list as for
CVE-2026-75899
Threats
Impact
Important
A flaw was found in fast-uri, a software component used for parsing Uniform Resource Identifiers (URIs) in Node.js applications. This vulnerability arises from an issue in how fast-uri processes the scheme part of a URI, specifically when it contains special characters that are percent-encoded. An attacker can exploit this by crafting a malicious URI, causing the parser to misinterpret the host, which can lead to serious security risks. These risks include unauthorized redirection to external websites, server-side request forgery (SSRF) where the application makes unintended requests to internal or external resources, and bypassing security policies.
7.5 (High)
Affected products
Fixed
2 products, the same list as for
CVE-2026-75899
Threats
Impact
Important
A flaw was found in fast-uri. This component improperly serializes the port component of a Uniform Resource Identifier (URI) without validating its content. A remote attacker can exploit this by crafting a malicious port value that injects authority delimiters. This manipulation can demote the intended host to user information and redirect the authority to an attacker-controlled host, leading to information disclosure as applications interpret the attacker's host as legitimate.
7.5 (High)
Affected products
Fixed
2 products, the same list as for
CVE-2026-75899
Threats
Impact
Important
References
28 references
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},
{
"category": "external",
"summary": "https://github.com/fastify/fast-uri/security/advisories/GHSA-jqff-g426-hqxp",
"url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-jqff-g426-hqxp"
}
],
"release_date": "2026-08-24T10:07:56.440000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-24T12:11:44+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:71543"
},
{
"category": "workaround",
"details": "There is no mitigation available for this issue. Apply updates as they become available from Red Hat product teams.",
"product_ids": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "fast-uri: fast-uri: URI parsing flaw enables server-side request forgery and redirects"
},
{
"cve": "CVE-2026-84292",
"cwe": {
"id": "CWE-140",
"name": "Improper Neutralization of Delimiters"
},
"discovery_date": "2026-09-02T20:21:15.599288+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2527747"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in fast-uri. This component improperly serializes the port component of a Uniform Resource Identifier (URI) without validating its content. A remote attacker can exploit this by crafting a malicious port value that injects authority delimiters. This manipulation can demote the intended host to user information and redirect the authority to an attacker-controlled host, leading to information disclosure as applications interpret the attacker\u0027s host as legitimate.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important flaw. Applications utilizing the `fast-uri` library in Red Hat environments are susceptible to authority injection if they process untrusted data as the port component of a URI. This could allow an attacker to redirect network traffic to an arbitrary host, compromising communication integrity.",
"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": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
]
},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-84292"
},
{
"category": "external",
"summary": "RHBZ#2527747",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2527747"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-84292",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-84292"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-84292",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84292"
},
{
"category": "external",
"summary": "https://cna.openjsf.org/security-advisories.html",
"url": "https://cna.openjsf.org/security-advisories.html"
},
{
"category": "external",
"summary": "https://github.com/fastify/fast-uri/security/advisories/GHSA-qw65-cvwx-89v3",
"url": "https://github.com/fastify/fast-uri/security/advisories/GHSA-qw65-cvwx-89v3"
}
],
"release_date": "2026-09-02T20:09:51.415000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-24T12:11:44+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
"product_ids": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:71543"
},
{
"category": "workaround",
"details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
"product_ids": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
"version": "3.1"
},
"products": [
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.noarch",
"AppStream-10.2.Z:cockpit-image-builder-0:94.4-1.el10_2.src"
]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "fast-uri: fast-uri: Authority Injection via Unvalidated Port Serialization"
}
]
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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