CVE-2026-78660
HTTP/2 transport accepts malformed framing-related headers in net/http
CVE-2026-78660 is fixed in 21 products on 1 platform, first by DEBIAN-CVE-2026-78660, released October 12, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
7.5
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0054
45th percentile
Historically, we have been rather lax about malformed framing-related headers in our HTTP/2 implementation, as they cannot interfere with HTTP/2 framing. However, this makes it possible for our HTTP/2 implementation to forward responses containing such headers to an HTTP/1 client when acting as a reverse proxy. If the HTTP/1 client also does not behave strictly enough, this can result in response smuggling.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| delve · RHEL 8 | 0:1.26.1-1.module+el8.10.0+24516+40554724 | RHSA-2026:86203 | Oct 21, 2026 |
| delve · almalinux 8 | 1.26.1-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| go-toolset · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| go-toolset · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| go-toolset · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| go-toolset · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| go-toolset · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| go1.26 · opensuse-leap 16.0 | 1.26.9-160000.1.1 | OPENSUSE-SU-2026:22095-1 | Nov 7, 2026 |
| go1.26 · sles 15.6 | 1.26.9-150000.1.33.1 | SUSE-SU-2026:4629-1 | Nov 7, 2026 |
| go1.26 · sles 15.7 | 1.26.9-150000.1.33.1 | SUSE-SU-2026:4629-1 | Nov 7, 2026 |
| go1.26 · sles 16.0 | 1.26.9-160000.1.1 | SUSE-SU-2026:24239-1 | Nov 7, 2026 |
| go1.26-openssl · sles 15.6 | 1.26.10-150600.13.18.1 | SUSE-SU-2026:4866-1 | Nov 7, 2026 |
| go1.26-openssl · sles 15.7 | 1.26.10-150600.13.18.1 | SUSE-SU-2026:4866-1 | Nov 7, 2026 |
| go1.27 · opensuse-leap 16.0 | 1.27.2-160000.1.1 | OPENSUSE-SU-2026:22093-1 | Nov 7, 2026 |
| go1.27 · sles 15.6 | 1.27.2-150000.1.12.1 | SUSE-SU-2026:4625-1 | Nov 7, 2026 |
| go1.27 · sles 15.7 | 1.27.2-150000.1.12.1 | SUSE-SU-2026:4625-1 | Nov 7, 2026 |
| go1.27 · sles 16.0 | 1.27.2-160000.1.1 | SUSE-SU-2026:24237-1 | Nov 7, 2026 |
| golang · RHEL 10 | 1.26.10-1.el10_0 | RHSA-2026:87040 | Oct 21, 2026 |
| golang · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| 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 | Oct 20, 2026 |
| golang-1.22 · Ubuntu 24.04.5 LTS (noble) | 1.22.2-2ubuntu0.5 | golang-1.22 1.22.2-2ubuntu0.5 | Oct 20, 2026 |
| 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 | Oct 20, 2026 |
| golang-1.22-go · Ubuntu 24.04.5 LTS (noble) | 1.22.2-2ubuntu0.5 | golang-1.22-go 1.22.2-2ubuntu0.5 | Oct 20, 2026 |
| 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 | Oct 20, 2026 |
| golang-1.22-src · Ubuntu 24.04.5 LTS (noble) | 1.22.2-2ubuntu0.5 | golang-1.22-src 1.22.2-2ubuntu0.5 | Oct 20, 2026 |
| golang-1.26 · Debian 14 | 1.26.9-1 | DEBIAN-CVE-2026-78660 | Oct 12, 2026 |
| golang-1.27 · Debian 14 | 1.27.2-1 | DEBIAN-CVE-2026-78660 | Oct 12, 2026 |
| golang-bin · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang-bin · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang-bin · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang-bin · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang-bin · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang-bin · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| golang-docs · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang-docs · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang-docs · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang-docs · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang-docs · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang-docs · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| golang-golang-x-net · Debian 14 | 1:0.60.0-1 | DEBIAN-CVE-2026-78660 | Oct 12, 2026 |
| golang-misc · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang-misc · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang-misc · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang-misc · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang-misc · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang-misc · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| golang-race · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang-race · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang-race · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang-race · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang-race · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang-shared · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| golang-src · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang-src · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang-src · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang-src · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang-src · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang-src · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| golang-tests · RHEL 8 | 0:1.26.10-1.module+el8.10.0+25107+6b50279c | RHSA-2026:86203 | Oct 21, 2026 |
| golang-tests · RHEL 9 | 0:1.26.10-1.el9_8 | RHSA-2026:86196 | Oct 21, 2026 |
| golang-tests · almalinux 10 | 1.26.10-1.el10_2.alma.1 | ALSA-2026:86093 | Nov 7, 2026 |
| golang-tests · almalinux 8 | 1.26.10-1.module_el8.10.0+4307+6e4cbc60 | ALSA-2026:86203 | Nov 7, 2026 |
| golang-tests · almalinux 9 | 1.26.10-1.el9_8 | ALSA-2026:86196 | Nov 7, 2026 |
| golang-tests · amzn 2023 | 1.26.9-1.amzn2023.0.1 | ALAS2023-2026-3225 | Nov 7, 2026 |
| google-cloud-sap-agent · sles 16.0 | 3.15-160000.5.1 | SUSE-SU-2026:24604-1 | Nov 8, 2026 |
| kubevirt1.9 · opensuse-leap 16.0 | 1.9.1-160000.1.1 | OPENSUSE-SU-2026:22180-1 | Nov 7, 2026 |
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