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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-59921

CVE-2026-59921: 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 severityMedium5.7

    Medium [CVE-2026-59921] CRLF Injection via Multipart Filename in Netty HttpPostRequestEncoder

    CVE-2026-59921Source published Source updated

    Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, HttpPostRequestEncoder constructs multipart HTTP request bodies by directly concatenating user-supplied filenames and field names into Content-Disposition MIME headers without validating or sanitizing CRLF characters (\r\n). Since MIME headers are delimited by CRLF, an attacker who controls the filename can inject arbitrary MIME headers into the multipart body part. The root cause is that neither the encoder nor the FileUpload implementations' setFilename() methods, which only check for null, neutralize CRLF characters before the filename is embedded into the header. A flaw was found in Netty's HttpPostRequestEncoder, a widely used Java networking library component…

    Affected products in this advisory
    • Red Hat build of Quarkus 3.27.4.SP3
    • Red Hat build of Quarkus 3.33.2.SP3
    • Cryostat 4
    • OpenShift Serverless

    19 more entries in the full advisory.

    Source-reported affected versions
    • < 4.1.136.Final
    • < 4.2.16.Final
    Source-reported fixed versions
    • 4.1.136
    • 4.2.16
    • netty-codec-http
    • RHSA-2026:47189

    1 more entries in the full advisory.

    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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