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CVE-2026-63374VulnerabilityPublished Updated

Red Hat Security Advisory: satellite/iop-vulnerability-engine-rhel9 container image available as a Technology Preview

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Authoritative record:CVE-2026-63374· Critical 9.3

Not known to be exploited · CVSS 9.3 Critical : upgrade Red Hat to 4.14.2 as a priority.

Data as of 13 Nov 2026, 15:04 UTC

CVSS 4.0 base score
9.3Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 4.14.2
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 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 anyio to 4.14.2.

Affected software

ProductAffectedFixed in
agronholmanyioAffected
  • <4.14.2
Fixed in
  • 4.14.2

AI-suggested

Red Hat advises following the Red Hat Satellite documentation for installing and configuring Red Hat Lightspeed in Satellite. Since exploitation requires a man-in-the-middle position and affects only internationalized domain names with non-ASCII characters, organizations should monitor network environments for interception risks. Customers with a Technical Account Manager (TAM) can consult directly for tailored guidance. Red Hat has not indicated any temporary mitigations or workarounds specific to this vulnerability.

Description

CVE-2026-63374 is a moderate severity vulnerability affecting the AnyIO framework used in Red Hat products. It allows a remote attacker positioned to intercept network traffic to bypass TLS certificate validation when connecting to internationalized domain names (IDNs) due to the use of an outdated IDNA 2003 encoding standard instead of IDNA 2008. This flaw can enable an attacker to impersonate a legitimate server and intercept or alter sensitive communications. Exploitation requires a man-in-the-middle position and only affects connections to IDNs with non-ASCII characters. No remote code execution is possible, and the impact is limited to specific redirected sessions.

References

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