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CVE-2026-84303VulnerabilityPublished Updated

SUSE grpc · Security update for warewulf4

Affects SUSE grpcSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-84303· Medium 6.3

Not known to be exploited · CVSS 6.3 Medium : upgrade SUSE grpc to 1.56.0 when convenient.

Data as of 13 Nov 2026, 22:06 UTC

CVSS 4.0 base score
6.3Medium
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.56.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 13 Nov 2026.

What to do

Upgrade google.golang.org/grpc to 1.56.0.

Affected software

ProductAffectedFixed in
Gogoogle.golang.org/grpcpkg:golang/google.golang.org/grpcOther threatsAffected
  • <1.56.0
Fixed in
  • 1.56.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Apply the security update for warewulf4 that upgrades the google.golang.org/grpc library to a fixed version addressing CVE-2026-84445 and CVE-2026-84303. This update resolves the denial of service and authorization bypass vulnerabilities. No additional mitigation steps are indicated beyond applying this update.

Description

This security update for warewulf4 addresses two critical vulnerabilities in the google.golang.org/grpc library. The first vulnerability (CVE-2026-84445) allows denial of service (DoS) via a crash caused by missing ':authority' and 'Host' headers in gRPC-Go xDS servers. The second vulnerability (CVE-2026-84303) involves an xDS RBAC HTTP filter implementation issue that permits bypassing authorization policies through mixed-case or canonical-case header matches.

References

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