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Highest advisory severityMedium 1 vendor · 1 advisory

CVE-2026-63379

CVE-2026-63379: 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 severityMedium6.5

    Medium [CVE-2026-63379] HTTP header smuggling allows authorization bypass or cache poisoning

    CVE-2026-63379Source published Source updated

    Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. An unauthenticated remote attacker can exploit a vulnerability where chunked HTTP (Hypertext Transfer Protocol) trailers are incorrectly merged into request headers. Red Hat ships libevent in multiple products including Red Hat Enterprise Linux, RHIVOS…

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 9
    • Cert Manager support for Red Hat OpenShift release 1.20
    • Red Hat Hardened Images

    6 more entries in the full advisory.

    Source-reported affected versions
    • < 2.1.13
    • < 2.2.2-alpha
    Source-reported fixed versions
    • 2.1.13
    • 2.2.2
    • libevent-0:2.1.13-1.el10_2
    • libevent-0:2.1.13-1.el9_8

    23 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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