EUVD-2026-95421Published

When http.Transport sends an HTTP/1 CONNECT request with a non-empty Request.Body, it writes the body directly to the connection without framing after the request headers. If the server rejects the CONNECT request with a non-2xx keep-alive …

Exact source revision recorded 28 Oct 2026 08:16:35 UTC. It does not establish the source's current position. Latest evidence.

Recorded JSON

euvd · EUVD-2026-95421

Published

When http.Transport sends an HTTP/1 CONNECT request with a non-empty Request.Body, it writes the body directly to the connection without framing after the request headers. If the server rejects the CONNECT request with a non-2xx keep-alive response, Transport returns the connection to the idle pool. Because CONNECT requests do not have a request body, the server may interpret the trailing body bytes as a subsequent pipelined HTTP/1.1 request on the connection, leaving the pooled connection desynchronized and causing the next caller that reuses it to read the response to the injected request. In reverse proxies (including httputil.ReverseProxy) that forward CONNECT requests through a shared Transport, this can lead to cross-user response poisoning.

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Oct 8, 2026, 10:53:58 PM

dateUpdated: Oct 9, 2026, 3:54:59 PM

18 related source bulletins · separate from aliases

SUSE-SU-2026:24239-1: Security update for go1.26

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78667 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

openSUSE-SU-2026:22093-1: Security update for go1.27

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

openSUSE-SU-2026:22095-1: Security update for go1.26

openSUSE-SU-2026:12093-1: go1.26-1.26.9-1.1 on GA media

openSUSE-SU-2026:12112-1: rclone-1.75.2-1.1 on GA media

CVE-2026-56857 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-84445 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032

RHSA-2026:87043: Red Hat Security Advisory: golang security, bug fix, and enhancement update

CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

RHSA-2026:86196: Red Hat Security Advisory: golang security, bug fix, and enhancement update

openSUSE-SU-2026:12101-1: go1.27-1.27.2-1.1 on GA media

WID-SEC-W-2026-3841: Golang Go: Mehrere Schwachstellen

RHSA-2026:86093: Red Hat Security Advisory: golang security, bug fix, and enhancement update

RHSA-2026:87246: Red Hat Security Advisory: go-toolset:rhel8 security, bug fix, and enhancement update

CVE-2024-45336 · CVE-2025-4673 · CVE-2025-22866 · CVE-2025-22874 · CVE-2025-68121 · CVE-2026-27137 · CVE-2026-27143 · CVE-2026-27144 · CVE-2026-27145 · CVE-2026-32280 · CVE-2026-32281 · CVE-2026-32282 · CVE-2026-32283 · CVE-2026-33810 · CVE-2026-33811 · CVE-2026-33814 · CVE-2026-33818 · CVE-2026-39820 · CVE-2026-39821 · CVE-2026-42499 · CVE-2026-42504 · CVE-2026-56853 · CVE-2026-56858 · CVE-2026-56859 · CVE-2026-56860 · CVE-2026-56862 · CVE-2026-56866 · CVE-2026-78659 · CVE-2026-78660 · CVE-2026-78663 · CVE-2026-78667 · CVE-2026-78669 · CVE-2026-94439 · CVE-2026-94440 · CVE-2026-94444 · CVE-2026-94447 · CVE-2026-94448 · CVE-2026-97030 · CVE-2026-97031 · CVE-2026-97032 · CVE-2026-111943

RHSA-2026:87041: Red Hat Security Advisory: golang security, bug fix, and enhancement update

RHSA-2026:87245: Red Hat Security Advisory: go-toolset:rhel8 security, bug fix, and enhancement update

RHSA-2026:86203: Red Hat Security Advisory: go-toolset:rhel8 security, bug fix, and enhancement update

RHSA-2026:87042: Red Hat Security Advisory: golang security, bug fix, and enhancement update

RHSA-2026:87040: Red Hat Security Advisory: golang security, bug fix, and enhancement update

msrc_CVE-2026-56866: HTTP/1 client connection desynchronization after CONNECT rejection in net/http

CVE-2026-56866

SUSE-SU-2026:24237-1: Security update for go1.27

Source published: Oct 8, 2026, 10:53:58 PM (timezone not stated)
Source modified: Oct 9, 2026, 3:54:59 PM (timezone not stated)
Observed here: 28 Oct 2026 08:16:35 UTC
Source terms: ENISA EUVD · source terms and attribution apply

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: euvd · ENISA EUVD · source terms and attribution apply. Source text is retained; field grouping and change labels are provided by ChangeIntel.

EUVD CVSS 3.1 · 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N