# CVE-2026-94439: HTTP/1 server connection desynchronization after 2xx CONNECT response in net/http

CVE-2026-94439 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2026-94439, released October 12, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-94439
- Priority: High
- CVSS: 7.5 (Important)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 8, 2026
- Weakness: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-94439

## Description

When an HTTP server handler sends a 2xx response to an HTTP/1 CONNECT request and returns without hijacking the connection, the server improperly continues to read and serve requests from the connection. Since a 2xx response to an HTTP/1 CONNECT converts the connection into a tunnel, the server should not treat the connection as continuing to contain HTTP. The impact of this misbehavior is mostly limited to potential request smuggling, where an intermediate proxy considers the data on the connection to be tunneled and the server considers it to be HTTP.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | amazon-ecr-credential-helper amzn 2023 | 0.12.0-5.amzn2023 | [ALAS2023-2026-3271](https://patchblox.com/security/data/fix/linux/alas2023-2026-3271.md) | Nov 7, 2026 |
| Linux | delve RHEL 8 | 0:1.26.1-1.module+el8.10.0+24516+40554724 | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | delve almalinux 8 | 1.26.1-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | go-toolset RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | go-toolset RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | go-toolset almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | go-toolset almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | go-toolset almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | go1.26 opensuse-leap 16.0 | 1.26.9-160000.1.1 | [OPENSUSE-SU-2026:22095-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22095-1.md) | Nov 7, 2026 |
| Linux | go1.26 sles 15.6 | 1.26.9-150000.1.33.1 | [SUSE-SU-2026:4629-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4629-1.md) | Nov 7, 2026 |
| Linux | go1.26 sles 15.7 | 1.26.9-150000.1.33.1 | [SUSE-SU-2026:4629-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4629-1.md) | Nov 7, 2026 |
| Linux | go1.26 sles 16.0 | 1.26.9-160000.1.1 | [SUSE-SU-2026:24239-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24239-1.md) | Nov 7, 2026 |
| Linux | go1.26-openssl sles 15.6 | 1.26.10-150600.13.18.1 | [SUSE-SU-2026:4866-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4866-1.md) | Nov 7, 2026 |
| Linux | go1.26-openssl sles 15.7 | 1.26.10-150600.13.18.1 | [SUSE-SU-2026:4866-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4866-1.md) | Nov 7, 2026 |
| Linux | go1.27 opensuse-leap 16.0 | 1.27.2-160000.1.1 | [OPENSUSE-SU-2026:22093-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-22093-1.md) | Nov 7, 2026 |
| Linux | go1.27 sles 15.6 | 1.27.2-150000.1.12.1 | [SUSE-SU-2026:4625-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4625-1.md) | Nov 7, 2026 |
| Linux | go1.27 sles 15.7 | 1.27.2-150000.1.12.1 | [SUSE-SU-2026:4625-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-4625-1.md) | Nov 7, 2026 |
| Linux | go1.27 sles 16.0 | 1.27.2-160000.1.1 | [SUSE-SU-2026:24237-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-24237-1.md) | Nov 7, 2026 |
| Linux | golang RHEL 10 | 1.26.10-1.el10_0 | [RHSA-2026:87040](https://patchblox.com/security/data/fix/linux/rhsa-2026-87040.md) | Oct 21, 2026 |
| Linux | golang RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | golang-1.22 Ubuntu 22.04.1 LTS (jammy) | 1.22.2-2~22.04.4 | [golang-1.22 1.22.2-2~22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-1.22-1.22.2-2-22.04.4.md) | Oct 20, 2026 |
| Linux | golang-1.22 Ubuntu 24.04.5 LTS (noble) | 1.22.2-2ubuntu0.5 | [golang-1.22 1.22.2-2ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-1.22-1.22.2-2ubuntu0.5.md) | Oct 20, 2026 |
| Linux | golang-1.22-go Ubuntu 22.04.1 LTS (jammy) | 1.22.2-2~22.04.4 | [golang-1.22-go 1.22.2-2~22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-1.22-go-1.22.2-2-22.04.4.md) | Oct 20, 2026 |
| Linux | golang-1.22-go Ubuntu 24.04.5 LTS (noble) | 1.22.2-2ubuntu0.5 | [golang-1.22-go 1.22.2-2ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-1.22-go-1.22.2-2ubuntu0.5.md) | Oct 20, 2026 |
| Linux | golang-1.22-src Ubuntu 22.04.1 LTS (jammy) | 1.22.2-2~22.04.4 | [golang-1.22-src 1.22.2-2~22.04.4](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-1.22-src-1.22.2-2-22.04.4.md) | Oct 20, 2026 |
| Linux | golang-1.22-src Ubuntu 24.04.5 LTS (noble) | 1.22.2-2ubuntu0.5 | [golang-1.22-src 1.22.2-2ubuntu0.5](https://patchblox.com/security/data/fix/linux/ubuntu-noble-golang-1.22-src-1.22.2-2ubuntu0.5.md) | Oct 20, 2026 |
| Linux | golang-1.26 Debian 14 | 1.26.9-1 | [DEBIAN-CVE-2026-94439](https://patchblox.com/security/data/fix/linux/debian-cve-2026-94439.md) | Oct 12, 2026 |
| Linux | golang-1.27 Debian 14 | 1.27.2-1 | [DEBIAN-CVE-2026-94439](https://patchblox.com/security/data/fix/linux/debian-cve-2026-94439.md) | Oct 12, 2026 |
| Linux | golang-bin RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang-bin RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang-bin almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang-bin almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang-bin almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang-bin amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | golang-docs RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang-docs RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang-docs almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang-docs almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang-docs almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang-docs amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | golang-misc RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang-misc RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang-misc almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang-misc almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang-misc almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang-misc amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | golang-race RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang-race RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang-race almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang-race almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang-race almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang-shared amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | golang-src RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang-src RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang-src almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang-src almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang-src almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang-src amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | golang-tests RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | [RHSA-2026:86203](https://patchblox.com/security/data/fix/linux/rhsa-2026-86203.md) | Oct 21, 2026 |
| Linux | golang-tests RHEL 9 | 0:1.26.10-1.el9_8 | [RHSA-2026:86196](https://patchblox.com/security/data/fix/linux/rhsa-2026-86196.md) | Oct 21, 2026 |
| Linux | golang-tests almalinux 10 | 1.26.10-1.el10_2.alma.1 | [ALSA-2026:86093](https://patchblox.com/security/data/fix/linux/alsa-2026-86093.md) | Nov 7, 2026 |
| Linux | golang-tests almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | [ALSA-2026:86203](https://patchblox.com/security/data/fix/linux/alsa-2026-86203.md) | Nov 7, 2026 |
| Linux | golang-tests almalinux 9 | 1.26.10-1.el9_8 | [ALSA-2026:86196](https://patchblox.com/security/data/fix/linux/alsa-2026-86196.md) | Nov 7, 2026 |
| Linux | golang-tests amzn 2023 | 1.26.9-1.amzn2023.0.1 | [ALAS2023-2026-3225](https://patchblox.com/security/data/fix/linux/alas2023-2026-3225.md) | Nov 7, 2026 |
| Linux | oci-add-hooks amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.13 | [ALAS2023-2026-3272](https://patchblox.com/security/data/fix/linux/alas2023-2026-3272.md) | Nov 7, 2026 |
| Linux | oci-add-hooks-debuginfo amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.13 | [ALAS2023-2026-3272](https://patchblox.com/security/data/fix/linux/alas2023-2026-3272.md) | Nov 7, 2026 |
| Linux | oci-add-hooks-debugsource amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.13 | [ALAS2023-2026-3272](https://patchblox.com/security/data/fix/linux/alas2023-2026-3272.md) | Nov 7, 2026 |
| Linux | soci-snapshotter amzn 2023 | 0.16.0-1.amzn2023.0.2 | [ALAS2023-2026-3270](https://patchblox.com/security/data/fix/linux/alas2023-2026-3270.md) | Nov 7, 2026 |

---

Data as of 2026-11-09T07:25:28Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.