CVE-2026-78663
Double flow control refund on HTTP/2 server streams in net/http
CVE-2026-78663 is fixed in 35 products on 1 platform, first by DEBIAN-CVE-2026-78663, released October 12, 2026. It is not reported as exploited. Patch Radar priority: High.
High
CVSS
9.1
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0086
58th percentile
The HTTP/2 server can refund connection-level flow control twice for the same data: Once when a client resets a stream (refunding data for any sent-but-unread portion of the stream), and again when a request handler reads the buffered data. A malicious client can exploit this to bypass the configured connection-level flow control limit (MaxReceiveBufferPerConnection). Total buffered data is still limited by the concurrent stream limit and stream-level flow control.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| amazon-cloudwatch-agent · amzn 2023 | 1.300073.2-1.amzn2023 | ALAS2023-2026-3350 | Nov 7, 2026 |
| amazon-ecr-credential-helper · amzn 2023 | 0.12.0-5.amzn2023 | ALAS2023-2026-3271 | Nov 7, 2026 |
| cadvisor · opensuse-leap 16.0 | 0.60.6-bp160.4.1 | OPENSUSE-SU-2026:22218-1 | Nov 7, 2026 |
| containerd · amzn 2023 | 2.3.7-1.amzn2023.0.1 | ALAS2023-2026-3273 | Nov 7, 2026 |
| containerd-debuginfo · amzn 2023 | 2.3.7-1.amzn2023.0.1 | ALAS2023-2026-3273 | Nov 7, 2026 |
| containerd-debugsource · amzn 2023 | 2.3.7-1.amzn2023.0.1 | ALAS2023-2026-3273 | Nov 7, 2026 |
| containerd-stress · amzn 2023 | 2.3.7-1.amzn2023.0.1 | ALAS2023-2026-3273 | Nov 7, 2026 |
| containerd-stress-debuginfo · amzn 2023 | 2.3.7-1.amzn2023.0.1 | ALAS2023-2026-3273 | Nov 7, 2026 |
| credentials-fetcher · amzn 2023 | 2.0.3-1.amzn2023.0.7 | ALAS2023-2026-3228 | Nov 7, 2026 |
| 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 | 1.26.10-160000.1.1 | OPENSUSE-SU-2026:22152-1 | Nov 7, 2026 |
| go1.26 · sles 15.6 | 1.26.10-150000.1.36.1 | SUSE-SU-2026:4864-1 | Nov 7, 2026 |
| go1.26 · sles 15.7 | 1.26.10-150000.1.36.1 | SUSE-SU-2026:4864-1 | Nov 7, 2026 |
| go1.26 · sles 16.0 | 1.26.10-160000.1.1 | SUSE-SU-2026:24359-1 | 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-2026-78663 | Oct 12, 2026 |
| golang-1.27 · Debian 14 | 1.27.2-1 | DEBIAN-CVE-2026-78663 | 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-2026-78663 | 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 |
| nerdctl · amzn 2023 | 2.3.5-1.amzn2023.0.2 | ALAS2023-2026-3274 | Nov 7, 2026 |
| oci-add-hooks · amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.13 | ALAS2023-2026-3272 | Nov 7, 2026 |
| oci-add-hooks-debuginfo · amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.13 | ALAS2023-2026-3272 | Nov 7, 2026 |
| oci-add-hooks-debugsource · amzn 2023 | 0-0.1.20200504git268e3bb.amzn2023.0.13 | ALAS2023-2026-3272 | Nov 7, 2026 |
| soci-snapshotter · amzn 2023 | 0.16.0-1.amzn2023.0.2 | ALAS2023-2026-3270 | Nov 7, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
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.