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Highest advisory severityHigh 1 vendor · 1 advisory

CVE-2026-70455

CVE-2026-70455: 1 tracked advisory record across Red Hat. Compare vendor sources and published fix guidance.

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 severityHigh7.5

    High [CVE-2026-70455] Denial of Service via Zstandard compression thread exhaustion

    CVE-2026-70455Source published Source updated

    rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources. By sending requests using the --zt Zstandard compression alias, an attacker can bypass security directives and spawn an excessive number of worker threads. RHEL 9 and older versions are unaffected. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-770. Affected Red Hat products: Red Hat Enterprise Linux 10.…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat package: rsync
    Source-reported affected versions
    • < 3.4.2
    • < 3.5.0
    Source-reported fixed versions
    • 3.5.0
    • rsync-0:3.5.0-3.el10_2
    • RHSA-2026:67463
    Mitigation guidance
    • If the rsync daemon is unused, immediately disable rsyncd.service to eliminate the attack surface. For active deployments, restrict network access (TCP 873) strictly to trusted hosts using firewall rules. Do not rely on refuse options = compress-threads for protection, as the --zt alias bypasses this configuration. Network isolation is the most effective defense.
    Full advisory and evidenceOpen source bulletin

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