Summary
yggdrasil is a system daemon that subscribes to topics on an MQTT broker and routes any data received on the topics to an appropriate child "worker" process, exchanging data with its worker processes through a D-Bus message broker.
Security Fix(es):
* net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811)
* golang.org/x/net/idna: golang: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing (CVE-2026-39821)
* crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries (CVE-2026-27145)
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 2
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 10 | yggdrasil | 0.4.9.2-1.el10_2 |
| AlmaLinux · 10 | yggdrasil-devel | 0.4.9.2-1.el10_2 |
Vulnerabilities 3
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Critical 9.6
Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/net/idna
The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather than an error. This behavior can lead to privilege …
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High 7.5
Crash when handling long CNAME response in net
When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.
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Medium 6.5CVE-2026-27145 Public exploit
Inefficient candidate hostname parsing in crypto/x509
(*x509.Certificate).VerifyHostname previously called matchHostnames in a loop over all DNS Subject Alternative Name (SAN) entries. This caused strings.Split(host, ".") to execute repeatedly on the same input hostname. With a large DNS SAN list, verification c…
References
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report
https://access.redhat.com/security/cve/CVE-2026-27145
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report
https://access.redhat.com/security/cve/CVE-2026-33811
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report
https://access.redhat.com/security/cve/CVE-2026-39821
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report
https://bugzilla.redhat.com/2467822
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report
https://bugzilla.redhat.com/2480756
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report
https://bugzilla.redhat.com/2484207
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advisory
https://errata.almalinux.org/10/ALSA-2026-39573.html