Summary
go-fdo-client is the device-side implementation of FIDO Device Onboard specification in Go. It provides an FDO client that interacts with FDO manufacturer and owner servers to perform device on-boarding.
Security Fix(es):
* crypto/x509: golang: Go crypto/x509: Certificate validation bypass due to incorrect DNS constraint application (CVE-2026-33810)
* encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal (CVE-2026-33818)
* net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution (CVE-2026-56860)
* crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages (CVE-2026-56862)
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 1
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 10 | go-fdo-client | 1.0.0-4.el10_2.7 |
Vulnerabilities 5
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High 7.5
Case-sensitive excludedSubtrees name constraints cause Auth Bypass in crypto/x509
When verifying a certificate chain containing excluded DNS constraints, these constraints are not correctly applied to wildcard DNS SANs which use a different case than the constraint. This only affects validation of otherwise trusted certificate chains, issu…
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High 7.5
Enforce maximum recursion depth in encoding/asn1
Enforce a recursion limit in Unmarshal to prevent stack exhaustion when parsing deeply-nested, recursive structures.
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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
Limit handshake messages we are willing to accept post-handshake in crypto/tls
Handshake messages, such as KeyUpdate, are always considered as state-advancing, regardless of whether a handshake has been completed or not. As a result, a malicious client can keep sending KeyUpdate messages to force the server to keep performing key deriva…
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Medium 5.9
Avoid quadratic complexity in resolvePath in net/url
Previously, resolving relative paths containing parent directory ('..') segments performed string conversions and buffer rewrites on each step, resulting in quadratic time complexity and high memory allocation overhead. Now, path resolution operates on a byte…
References
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report
https://access.redhat.com/security/cve/CVE-2026-33810
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report
https://access.redhat.com/security/cve/CVE-2026-33818
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report
https://access.redhat.com/security/cve/CVE-2026-56860
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report
https://access.redhat.com/security/cve/CVE-2026-56862
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report
https://bugzilla.redhat.com/2456335
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report
https://bugzilla.redhat.com/2515815
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report
https://bugzilla.redhat.com/2515820
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report
https://bugzilla.redhat.com/2515839
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advisory
https://errata.almalinux.org/10/ALSA-2026-62577.html
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report
https://www.redhat.com/security/data/cve/CVE-2026-42504.html