CVE-2026-56866
HighAdvisory
Published 8 Oct 2026In the index since 9 Oct 2026
- Severity
- High
- worst across findings
- CVSS
- 7.5
- base score, highest
- EPSS
- 0.003
- 22nd percentile
- CISA KEV
- Not listed
- no confirmed exploitation
- Charts affected
- 5,293
- of 18,131 indexed, latest versions
- Container images
- 6,123
- deployed by those charts
- Fix available
- 1 of 2
- affected packages
HTTP/1 client connection desynchronization after CONNECT rejection in net/http
Carried by container images the latest versions of 5,293 of 18,131 indexed charts deploy, on 6,123 images.
| Affected package | Affected versions | Fixed in | Images |
|---|---|---|---|
| stdlibgolang | go1.13, go1.13.1, go1.13.3, go1.13.4+209 more | 1.26.9 | 6,123 |
| golang-1.19deb | 1.19.8-2 | no fix listed | 1 |
- OSV records
- DEBIAN-CVE-2026-56866GO-2026-6605
- Trending
- Rank 10 in indexed charts, since 9 Oct 2026. See the ranking →
Charts affected
5,293 by stars
Container images carrying it
6,123 by charts deploying them
A fixed version is listed for 1 of the 2 affected packages.
| Container image | Digest | Package | Fixed in | Used by |
|---|---|---|---|---|
| volcanosh/ | f8b50088a732 | stdlib | 1.26.9 | 1 |
| voltha/ | d90403d58016 | stdlib | 1.26.9 | 1 |
| voltha/ | 259fc3a03f4e | stdlib | 1.26.9 | 1 |
| voltha/ | 762b272d439e | stdlib | 1.26.9 | 1 |
| vultr/ | 541c3e0aec58 | stdlib | 1.26.9 | 1 |
| vultr/ | 1806f17d620c | stdlib | 1.26.9 | 1 |
| vultr/ | 41d26735d437 | stdlib | 1.26.9 | 1 |
| wagnermanganelli164/ | d4ef27a4f180 | stdlib | 1.26.9 | 1 |
| wait4x/ | 4dcd86307de1 | stdlib | 1.26.9 | 1 |
| wallarm/ | 4d45db0ff240 | stdlib | 1.26.9 | 1 |
| wallarm/ | c8920e60c726 | stdlib | 1.26.9 | 1 |
| wallarm/ | a321bc974a19 | stdlib | 1.26.9 | 1 |
| wallarm/ | a1fecfdf987e | stdlib | 1.26.9 | 1 |
| wallarm/ | a591b9c91570 | stdlib | 1.26.9 | 1 |
| wallarm/ | 5cb2ae08b40f | stdlib | 1.26.9 | 1 |
| wallarm/ | 95ea2632326c | stdlib | 1.26.9 | 1 |
| wallarm/ | aecdb35c4def | stdlib | 1.26.9 | 1 |
| wallarm/ | b55ff6cecbd5 | stdlib | 1.26.9 | 1 |
| wallarm/ | 097cadc42336 | stdlib | 1.26.9 | 1 |
| wallarm/ | aecd88b24c51 | stdlib | 1.26.9 | 1 |
| wallarm/ | 7db2da8fce0b | stdlib | 1.26.9 | 1 |
| wallarm/ | 4314f3d2b918 | stdlib | 1.26.9 | 1 |
| wateim/ | 2520149ee574 | stdlib | 1.26.9 | 1 |
| wavefronthq/ | ded77b38c7c6 | stdlib | 1.26.9 | 1 |
| wavefronthq/ | af5fef9a4768 | stdlib | 1.26.9 | 1 |
| wazuh/ | 1da5c38c6a78 | stdlib | 1.26.9 | 1 |
| wazuh/ | 21994f40e0da | stdlib | 1.26.9 | 1 |
| wazuh/ | 5a065930682d | stdlib | 1.26.9 | 1 |
| wazuh/ | f09282d281f6 | stdlib | 1.26.9 | 1 |
| weaveworks/ | 174307de1b36 | stdlib | 1.26.9 | 1 |
| weaveworks/ | a9c2e9df4227 | stdlib | 1.26.9 | 1 |
| weaveworks/ | 3cdac6928a63 | stdlib | 1.26.9 | 1 |
| webdevops/ | 2446baee7b69 | stdlib | 1.26.9 | 1 |
| webdevops/ | f333704ecd60 | stdlib | 1.26.9 | 1 |
| webdevops/ | 051845d06d85 | stdlib | 1.26.9 | 1 |
| webdevops/ | 1d3b453fba99 | stdlib | 1.26.9 | 1 |
| webdevops/ | 381136dda026 | stdlib | 1.26.9 | 1 |
| webdevops/ | d3e1842ad419 | stdlib | 1.26.9 | 1 |
| webdevops/ | 7acd46a8a972 | stdlib | 1.26.9 | 1 |
| webdevops/ | 4fad7e14ad67 | stdlib | 1.26.9 | 1 |
| webdevops/ | 83b95faf10a0 | stdlib | 1.26.9 | 1 |
| webhookrelay/ | afffa826f068 | stdlib | 1.26.9 | 1 |
| weblate/ | 82848df56ecd | stdlib | 1.26.9 | 1 |
| weblate/ | b0f200f38d70 | stdlib | 1.26.9 | 1 |
| wernight/ | d211f29ebcfe | stdlib | 1.26.9 | 1 |
| willnorris/ | 21d0c90f4c31 | stdlib | 1.26.9 | 1 |
| wistefan/ | 3bd436164b51 | stdlib | 1.26.9 | 1 |
| wolveix/ | 199be1064b18 | stdlib | 1.26.9 | 1 |
| wolveix/ | 464d11e36e10 | stdlib | 1.26.9 | 1 |
| wolveix/ | ac252dba4165 | stdlib | 1.26.9 | 1 |