RHSA-2026:57541
Vulnerability from csaf_redhat - Published: 2026-08-20 14:48 - Updated: 2026-08-21 02:26Summary
Red Hat Security Advisory: osbuild-composer security update
Severity
Important
Notes
Topic: An update for osbuild-composer is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.
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: A service for building customized OS artifacts, such as VM images and OSTree commits, that uses osbuild under the hood. Besides building images for local usage, it can also upload images directly to cloud. It is compatible with composer-cli and cockpit-composer clients.
Security Fix(es):
* golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
* github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy (CVE-2026-55677)
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 golang.org/x/net/idna. ToASCII and ToUnicode incorrectly accept Punycode-encoded labels that decode to an ASCII-only hostname (for example, xn--example-.com returns example.com instead of an error). Applications that validate the ASCII form then convert to Unicode may grant access to a restricted hostname the ASCII check would have rejected.
8.2 (High)
Affected products
Fixed
33 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
A flaw was found in Echo, a Go web framework. An attacker can exploit a disagreement in URL path decoding between the router and the static file handler. The router processes raw encoded paths, while the static file handler unescapes encoded forward slashes. This allows an attacker to bypass route-level access controls, leading to unauthorized information disclosure by reading static files.
7.5 (High)
Affected products
Fixed
33 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-core-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-debugsource-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-tests-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:osbuild-composer-worker-debuginfo-0:132.2-10.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
18 references
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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.",
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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.",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "github.com/labstack/echo: Echo: Unauthorized Information Disclosure via URL Path Decoding Discrepancy"
}
]
}
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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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