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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-56392

CVE-2026-56392: 1 tracked advisory record across Red Hat. Compare source-reported impact, fixes and remediation.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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Vendor advisory comparison

Red Hat

1 advisory
  • Advisory severityMedium4.4

    Medium [CVE-2026-56392] GNU coreutils unexpand: Denial of Service via crafted tab stop values

    CVE-2026-56392Source published Source updated

    GNU coreutils unexpand is vulnerable to a heap-based buffer overflow due to an integer overflow during buffer allocation when processing large tab stop (-t) values. The multiplication used to calculate the allocation size can wrap around, resulting in an undersized buffer. When processing crafted input, subsequent writes exceed the allocated memory, leading to an out‑of‑bounds heap write. When running GNU coreutils unexpand with attacker-provided large tab stop (-t) arguments, this behavior leads to a crash and potentially achieve a heap write primitive depending on memory layout. This issue has been fixed in the commit b60a159fdc5bfcf9988d3a4cb6f53abe8ad5d35d A flaw was found in GNU coreutils, specifically in the `unexpand` utility. This can lead to an undersized memory buffer, allowing…

    Affected products in this advisory
    • Red Hat Enterprise Linux 8
    • Red Hat Hardened Images
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 6

    4 more entries in the full advisory.

    Source-reported affected versions
    Affected-version details not available in this record.
    Source-reported fixed versions
    • coreutils-0:8.30-20.el8_10
    • coreutils-main-9.11-5.hum1
    • RHBA-2026:47115
    • RHSA-2026:40724
    Mitigation guidance
    • Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
    Full advisory and evidenceOpen source bulletin

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