Summary
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):
* crypto/x509: golang: Denial of Service due to excessive resource consumption via crafted certificate (CVE-2025-61729)
* golang: archive/zip: Excessive CPU consumption when building archive index in archive/zip (CVE-2025-61728)
* golang: net/url: Memory exhaustion in query parameter parsing in net/url (CVE-2025-61726)
* crypto/tls: Unexpected session resumption in crypto/tls (CVE-2025-68121)
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.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | osbuild-composer | 149-4.el9_7.alma.3 |
| AlmaLinux · 9 | osbuild-composer-core | 149-4.el9_7.alma.3 |
| AlmaLinux · 9 | osbuild-composer-worker | 149-4.el9_7.alma.3 |
Vulnerabilities 4
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Critical 9.1
Unexpected session resumption in crypto/tls
During session resumption in crypto/tls, if the underlying Config has its ClientCAs or RootCAs fields mutated between the initial handshake and the resumed handshake, the resumed handshake may succeed when it should have failed. This may happen when a user ca…
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High 7.5
Memory exhaustion in query parameter parsing in net/url
The net/url package does not set a limit on the number of query parameters in a query. While the maximum size of query parameters in URLs is generally limited by the maximum request header size, the net/http.Request.ParseForm method can parse large URL-encode…
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High 7.5
Excessive resource consumption when printing error string for host certificate validation in crypto/x509
Within HostnameError.Error(), when constructing an error string, there is no limit to the number of hosts that will be printed out. Furthermore, the error string is constructed by repeated string concatenation, leading to quadratic runtime. Therefore, a certi…
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Medium 6.5
Excessive CPU consumption when building archive index in archive/zip
archive/zip uses a super-linear file name indexing algorithm that is invoked the first time a file in an archive is opened. This can lead to a denial of service when consuming a maliciously constructed ZIP archive.
References
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report
https://access.redhat.com/security/cve/CVE-2025-61726
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report
https://access.redhat.com/security/cve/CVE-2025-61728
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report
https://access.redhat.com/security/cve/CVE-2025-61729
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report
https://access.redhat.com/security/cve/CVE-2025-68121
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report
https://bugzilla.redhat.com/2418462
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report
https://bugzilla.redhat.com/2434431
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report
https://bugzilla.redhat.com/2434432
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report
https://bugzilla.redhat.com/2437111
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advisory
https://errata.almalinux.org/9/ALSA-2026-3753.html