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CVE-2026-39821VulnerabilityPublished

Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.31 security, enhancement & bug fix update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-39821· Critical 9.6

Not known to be exploited · CVSS 9.6 Critical · fixed in Red Hat package updates : patch Red Hat http as a priority.

Data as of 4 Nov 2026, 06:44 UTC

CVSS 3.1 base score
9.6Critical
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 1.27.0-rc.3, 1.26.6, 1.25.13 +1
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 May 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 3 Nov 2026.

What to do

Upgrade net/http and net/http/internal/http2 to 1.27.0-rc.3, 1.26.6 or 1.25.13; golang.org/x/net/idna to 0.55.0.

Affected software

ProductAffectedFixed in
Go standard librarynet/httpAffected
  • >=1.27.0-0 <1.27.0-rc.3
Fixed in
  • 1.27.0-rc.3
Go standard librarynet/httpAffected
  • >=1.26.0-0 <1.26.6
Fixed in
  • 1.26.6
Go standard librarynet/httpAffected
  • <1.25.13
Fixed in
  • 1.25.13
Go standard librarynet/http/internal/http2Affected
  • >=1.27.0-0 <1.27.0-rc.3
Fixed in
  • 1.27.0-rc.3
Go standard librarynet/http/internal/http2Affected
  • >=1.26.0-0 <1.26.6
Fixed in
  • 1.26.6
Go standard librarynet/http/internal/http2Affected
  • <1.25.13
Fixed in
  • 1.25.13

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

AI-suggested

A security update to Red Hat OpenShift Data Foundation 4.18.31 is available and includes fixes for the identified vulnerability. Users should apply this update after ensuring all previously released relevant errata have been applied. Refer to Red Hat's official documentation for detailed update procedures.

Description

Red Hat OpenShift Data Foundation 4.18.31 includes a security, enhancement, and bug fix update addressing issues such as CephX keyType and rotation changes and errors in Noobaa when uploading binaries. This update fixes the vulnerability identified as CVE-2026-39821. The advisory recommends applying this update after all previously released errata relevant to the system have been applied.

References

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