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/internal/nistec: golang: Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec (CVE-2025-22866)
* crypto/x509: golang: Go crypto/x509: Denial of Service via inefficient certificate chain validation (CVE-2026-32281)
* net/mail: golang: net/mail: Denial of Service via pathological email address parsing (CVE-2026-42499)
* mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header (CVE-2026-42504)
* github.com/open-telemetry/opentelemetry-go: go.opentelemetry.io/otel/baggage: go.opentelemetry.io/otel/propagation: OpenTelemetry-Go: Denial of Service via oversized baggage headers (CVE-2026-41178)
* 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.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 8 | osbuild-composer | 101.5-3.el8_10.alma.1 |
| AlmaLinux · 8 | osbuild-composer-core | 101.5-3.el8_10.alma.1 |
| AlmaLinux · 8 | osbuild-composer-worker | 101.5-3.el8_10.alma.1 |
Vulnerabilities 6
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High 7.5
Inefficient policy validation in crypto/x509
Validating certificate chains which use policies is unexpectedly inefficient when certificates in the chain contain a very large number of policy mappings, possibly causing denial of service. This only affects validation of otherwise trusted certificate chain…
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High 7.5
Quadratic string concatenation in consumePhrase in net/mail
Pathological inputs could cause DoS through consumePhrase when parsing an email address according to RFC 5322.
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High 7.5
Quadratic complexity in WordDecoder.DecodeHeader in mime
Decoding a maliciously-crafted MIME header containing many invalid encoded-words can consume excessive CPU.
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High 7.5
Echo: Encoded slash (%2F) bypasses route-level protection and exposes static files
Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, Echo's router and static file handler disagree on URL path decoding. The router matches routes using the raw encoded path (preserving %2F as-is), while StaticDirectoryHandler unescapes %2F to / before res…
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Medium 5.3
OpenTelemetry-Go's baggage parsing no longer caps raw header length
OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs. Versions 1.42.0 a…
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Medium 4.0
Timing sidechannel for P-256 on ppc64le in crypto/internal/nistec
Due to the usage of a variable time instruction in the assembly implementation of an internal function, a small number of bits of secret scalars are leaked on the ppc64le architecture. Due to the way this function is used, we do not believe this leakage is en…
References
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report
https://access.redhat.com/security/cve/CVE-2025-22866
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report
https://access.redhat.com/security/cve/CVE-2026-32281
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report
https://access.redhat.com/security/cve/CVE-2026-41178
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report
https://access.redhat.com/security/cve/CVE-2026-42499
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report
https://access.redhat.com/security/cve/CVE-2026-42504
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report
https://access.redhat.com/security/cve/CVE-2026-55677
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report
https://bugzilla.redhat.com/2344219
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report
https://bugzilla.redhat.com/2456333
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report
https://bugzilla.redhat.com/2467809
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report
https://bugzilla.redhat.com/2484204
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report
https://bugzilla.redhat.com/2484830
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report
https://bugzilla.redhat.com/2493622
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advisory
https://errata.almalinux.org/8/ALSA-2026-67148.html