CVE catalog
CVE-2026-35579
CoreDNS is a DNS server written in Go. In versions prior to 1.14.3, the gRPC, QUIC, DoH, and DoH3 transport implementations incorrectly handle TSIG authentication. For gRPC and QUIC, the server checks
- Severity
- Critical · CVSS 9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.61% · Oct 25, 2026
A flaw was found in CoreDNS. An unauthenticated network attacker can exploit incorrect handling of TSIG (Transaction Signature) authentication in the gRPC, QUIC, DoH (DNS over HTTPS), and DoH3 transport implementations. This vulnerability allows an attacker to bypass TSIG protection, leading to unauthorized access to functionalities such as zone transfers and dynamic DNS updates. For DoH and DoH3, the issue is more severe as any request with a TSIG record is treated as authenticated, even with an invalid key. github.com/coredns/coredns: CoreDNS: Authentication bypass allows unauthorized access to TSIG-protected functionalities The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | coredns | Not reported | 1.14.3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | coredns | cpe | Not reported | 1.14.3 | Not reported | Not reported | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_20703-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-35579]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-35579.json]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1283.json]
[CERT-Bund public advisories] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]