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CVE-2026-56851VulnerabilityPublished Updated

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

Affects Red Hat textSource GCVE Database

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Authoritative record:CVE-2026-56851· High 7.5

Not known to be exploited · CVSS 7.5 High.

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.
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

Affected software

ProductAffectedFixed in
Gogolang.org/x/textpkg:golang/golang.org/x/textOther threatsAffected
  • *
Fixed in–

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 via updated Red Hat Hardened Images RPMs, including opentelemetry-collector-0.162.0-0.1.hum1 packages. Users should apply these updates as per Red Hat's advisory instructions. Applications that do not use the Nickname profile or allocate appropriately sized buffers are not vulnerable. No additional mitigations are specified.

Description

CVE-2026-56851 is a denial of service vulnerability in the golang.org/x/text library's Nickname profile. An attacker can cause an application panic and crash by submitting specially crafted input that triggers an out-of-bounds slice indexing error when transforming text into an undersized buffer. This affects applications using the Nickname profile for string normalization or validation with small memory buffers. The vulnerability has been rated as important severity due to the potential for remote unauthenticated attackers to cause service disruption.

References

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