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CVE-2026-56851VulnerabilityPublished Updated

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Affects Red HatSource GCVE Database

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Authoritative record:CVE-2026-56851· High 7.5

Not known to be exploited · CVSS 7.5 High : upgrade Red Hat precis to 0.41.0 soon.

Data as of 30 Oct 2026, 07:50 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
Patch
Available – fixed in 0.41.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Oct 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 29 Oct 2026.

What to do

Upgrade golang.org/x/text/secure/precis to 0.41.0.

Affected software

ProductAffectedFixed in
golang.org/x/textgolang.org/x/text/secure/precisAffected
  • <0.41.0
Fixed in
  • 0.41.0
Gogolang.org/x/text/secure/precispkg:golang/golang.org/x/text/secure/precisOther threatsAffected
  • <0.41.0
Fixed in
  • 0.41.0

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

AI-suggested

A fix is available in the updated fulcio RPMs (version 1.9.0-0.1.hum1) included in the Red Hat Hardened Images update. Users should apply this update as per Red Hat's guidance at https://images.redhat.com/. Applications not using the Nickname profile or those allocating appropriately sized buffers are not vulnerable. No additional mitigations are indicated by the vendor advisory.

Description

CVE-2026-56851 is a denial of service vulnerability in the golang.org/x/text library's Nickname profile. An attacker can submit specially crafted input that triggers an out-of-bounds slice indexing error, causing the application to panic and crash. This affects applications that use the Nickname profile to normalize or validate user strings against undersized buffers. The vulnerability is rated as important due to the potential for unauthenticated remote attackers to cause service crashes. Red Hat has issued an update for the fulcio RPMs as part of Red Hat Hardened Images to address this issue.

References

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