VDB
RHSA-2026:52826
RHSA-2026:52826
PUBLISHED
CVSS 8.199999809265137 HIGH
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.
Risk Scores
CVSS 3.1
8.199999809265137
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | ignition-validate-0:2.21.0-7.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-debuginfo-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-0:2.21.0-7.el9_6.src as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-grub-0:2.21.0-7.el9_6.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-edge-0:2.21.0-7.el9_6.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-debugsource-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-validate-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-debuginfo-0:2.21.0-7.el9_6.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-debugsource-0:2.21.0-7.el9_6.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-validate-debuginfo-0:2.21.0-7.el9_6.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-0:2.21.0-7.el9_6.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-edge-0:2.21.0-7.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-grub-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-grub-0:2.21.0-7.el9_6.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-debuginfo-0:2.21.0-7.el9_6.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-edge-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-debuginfo-0:2.21.0-7.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-validate-debuginfo-0:2.21.0-7.el9_6.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
| Red Hat | ignition-0:2.21.0-7.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6) | 0:2.21.0-7.el9_6 |
…and 9 more
Timeline
- Aug 10, 2026 CVE Published
- Aug 12, 2026 CVE Updated
- Aug 12, 2026 Distribution Patch
- Aug 12, 2026 Distribution Patch
- Aug 12, 2026 Security Advisory
- Aug 12, 2026 Security Advisory
References
- https://access.redhat.com/errata/RHSA-2026:52826 advisory
- https://access.redhat.com/security/updates/classification/#important advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2480756 issue
- https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_52826.json advisory
- https://access.redhat.com/security/cve/CVE-2026-39821 advisory
- https://www.cve.org/CVERecord?id=CVE-2026-39821 advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-39821 advisory
- https://go.dev/cl/767220 advisory
- https://go.dev/issue/78760 advisory
- https://groups.google.com/g/golang-announce/c/iI-mYSI0lu8 advisory
- https://pkg.go.dev/vuln/GO-2026-5026 advisory