Red Hat Security Advisory: coreutils security update
Affects Red Hat coreutilsSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited · CVSS 4.6 Medium.
Data as of 31 Oct 2026, 20:20 UTC
- 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:NExploitation evidence
Disclosed: evidence found.
CVE published 24 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| GNUcoreutils | Affected
| 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
- access.redhat.com/errata/RHSA-2026:46515 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-56391 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- images.redhat.com (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_46515.json (opens in a new tab)
- suse.com/support/security/rating/ (opens in a new tab)
- ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_11764-1.json (opens in a new tab)
- suse.com/security/cve/CVE-2026-56391/ (opens in a new tab)
- suse.com/security/cve/CVE-2026-56392/ (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:67886 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2506691 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2506694 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_67886.json (opens in a new tab)