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Critical RHSA-2026:41240 3 CVEs

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Published Jul 23, 2026 · Updated Oct 20, 2026

Ecosystem: Red Hat

Fixed packages 4

ReleasePackageFixed in
Red Hat · Hardened Images 1 hummingbird:1 curl 0:8.21.0-0.1.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 libcurl 0:8.21.0-0.1.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 libcurl-devel 0:8.21.0-0.1.1.hum1
Red Hat · Hardened Images 1 hummingbird:1 libcurl-minimal 0:8.21.0-0.1.1.hum1

Vulnerabilities 3

  • Critical 9.8
    CVE-2026-10536

    HTTP/2 stream-dependency tree UAF

    A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl…

    curl curl curl curl Debian Ubuntu Azure Linux Alpine
  • High 7.5
    CVE-2026-9545

    exposing HTTP/3 early data

    In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate. When libcurl returns to the host…

    curl curl curl curl Debian Ubuntu Alpine
  • Medium 5.4
    CVE-2026-58055

    nghttp2 nghttpx - HTTP Request/Response Smuggling via Upgrade Request with Content-Length

    nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A …

    nghttp2 nghttp2 fluent-bit nghttp2 Debian Ubuntu Azure Linux Alpine Wolfi

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-58055
  • article
    https://access.redhat.com/security/updates/classification/
  • article
    https://images.redhat.com/
  • report
    https://access.redhat.com/security/cve/CVE-2026-10536
  • report
    https://access.redhat.com/security/cve/CVE-2026-9545
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_41240.json
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496756
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-9545
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-9545
  • article
    https://curl.se/docs/CVE-2026-9545.html
  • article
    https://curl.se/docs/CVE-2026-9545.json
  • article
    https://hackerone.com/reports/3752888
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2496766
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-10536
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-10536
  • article
    https://curl.se/docs/CVE-2026-10536.html
  • article
    https://curl.se/docs/CVE-2026-10536.json
  • article
    https://hackerone.com/reports/3751697
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2493954
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2026-58055
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2026-58055
  • article
    https://github.com/bikini/exploitarium/tree/main/nghttp2-nghttpx-upgrade-queue-poison-poc
  • article
    https://github.com/nghttp2/nghttp2/commit/ab28105c4a0197da24f8bfc414bc116055249e1e
  • article
    https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-request-with-content-length