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CVE-2026-56391VulnerabilityPublished Updated

Red Hat Security Advisory: coreutils security update

Affects Red Hat coreutilsSource GCVE Database

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Mentioned vulnerabilities

Authoritative record:CVE-2026-56391· Medium 4.6

Not known to be exploited · CVSS 4.6 Medium.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 4.0 base score
4.6Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Jul 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 31 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
GNUcoreutilsAffected
  • >=9.5 <=9.11
Fixed in–

AI-suggested

Red Hat has released updated coreutils packages (version 9.11-5.1.hum1) that fix these vulnerabilities. Users should apply these official updates promptly to mitigate the risks. No additional mitigation steps are indicated by the vendor advisory.

Description

Red Hat has issued a security advisory addressing vulnerabilities in the GNU coreutils package, specifically affecting the uniq and unexpand utilities. The uniq utility suffers from a denial of service and information disclosure vulnerability due to an out-of-bounds read with multibyte input (CVE-2026-56391). The unexpand utility is vulnerable to denial of service through crafted tab stop values (CVE-2026-56392). Updated coreutils packages have been released to mitigate these issues.

References

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