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
- 5,377
- of 18,104 indexed, latest versions
- Container images
- 6,223
- 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 5,377 of 18,104 indexed charts deploy, on 6,223 images.
| Affected package | Affected versions | Fixed in | Images |
|---|---|---|---|
| stdlibgolang | go1.13, go1.13.1, go1.13.3, go1.13.4+212 more | 1.26.9 | 6,223 |
| golang-1.19deb | 1.19.8-2 | no fix listed | 1 |
- OSV records
- DEBIAN-CVE-2026-56866GO-2026-6605
- Trending
- Rank 8 in indexed charts, since 9 Oct 2026. See the ranking →
Charts affected
5,377 by stars
Container images carrying it
6,223 by charts deploying them
A fixed version is listed for 1 of the 2 affected packages.
| Container image | Digest | Package | Fixed in | Used by |
|---|---|---|---|---|
| prom/ | 8176adea328e | stdlib | 1.26.9 | 2 |
| prom/ | a67e5e402ff5 | stdlib | 1.26.9 | 2 |
| prom/ | d43417c260e5 | stdlib | 1.26.9 | 2 |
| prom/ | e4ca62c0d62f | stdlib | 1.26.9 | 2 |
| prom/ | c0d39b8d4cfe | stdlib | 1.26.9 | 2 |
| qmcgaw/ | 3e2aa558946b | stdlib | 1.26.9 | 2 |
| rajnandan1/ | 30407afca731 | stdlib | 1.26.9 | 2 |
| rancher/ | cfc3c7284882 | stdlib | 1.26.9 | 2 |
| rancher/ | 9380f5dbae9a | stdlib | 1.26.9 | 2 |
| rancher/ | 12889bbcd1e8 | stdlib | 1.26.9 | 2 |
| rancher/ | 06c7a7a97727 | stdlib | 1.26.9 | 2 |
| rancher/ | 34ff0847cc47 | stdlib | 1.26.9 | 2 |
| rancher/ | 9bebefa0b908 | stdlib | 1.26.9 | 2 |
| rclone/ | 74c51b8817e5 | stdlib | 1.26.9 | 2 |
| ribbybibby/ | 718abe7f5e79 | stdlib | 1.26.9 | 2 |
| rookout/ | 4451a6f6b8ec | stdlib | 1.26.9 | 2 |
| rookout/ | 51c0fce64467 | stdlib | 1.26.9 | 2 |
| rotationalio/ | 0fc322d2dfc5 | stdlib | 1.26.9 | 2 |
| rss3/ | dae8a5bdd7a6 | stdlib | 1.26.9 | 2 |
| rss3/ | a4059dd32c48 | stdlib | 1.26.9 | 2 |
| scaleway/ | dcc14608d000 | stdlib | 1.26.9 | 2 |
| seafileltd/ | d0c66e4621bd | stdlib | 1.26.9 | 2 |
| shlinkio/ | 844e1f2b6455 | stdlib | 1.26.9 | 2 |
| sikalabs/ | 5f49bf889a64 | stdlib | 1.26.9 | 2 |
| squareup/ | 70f4cf270425 | stdlib | 1.26.9 | 2 |
| starrocks/ | 8c20435a7579 | stdlib | 1.26.9 | 2 |
| statping/ | e874da513a5c | stdlib | 1.26.9 | 2 |
| streamnative/ | 0e6d7aa3ef32 | stdlib | 1.26.9 | 2 |
| supporttools/ | f4f775dd43b9 | stdlib | 1.26.9 | 2 |
| syncthing/ | 775c4aac4862 | stdlib | 1.26.9 | 2 |
| taigaio/ | 4beed8f62c9f | stdlib | 1.26.9 | 2 |
| taigaio/ | fd4568a97a59 | stdlib | 1.26.9 | 2 |
| temporalio/ | 35034611d981 | stdlib | 1.26.9 | 2 |
| temporalio/ | a9f84fb9a374 | stdlib | 1.26.9 | 2 |
| temporalio/ | c0a44c26397b | stdlib | 1.26.9 | 2 |
| temporalio/ | c3e752127759 | stdlib | 1.26.9 | 2 |
| temporalio/ | e26758f5a1bf | stdlib | 1.26.9 | 2 |
| temporalio/ | af9c9349708f | stdlib | 1.26.9 | 2 |
| testinprod/ | 0a125bd77a2d | stdlib | 1.26.9 | 2 |
| thanosio/ | cf3e9b292e43 | stdlib | 1.26.9 | 2 |
| thesisrobot/ | 89ae07e787ca | stdlib | 1.26.9 | 2 |
| thesisrobot/ | 2d1c388a4bda | stdlib | 1.26.9 | 2 |
| thomasnyambati/ | 1e18a0944ceb | stdlib | 1.26.9 | 2 |
| thomasnyambati/ | 148ae3f99fea | stdlib | 1.26.9 | 2 |
| thomseddon/ | e875194d67e2 | stdlib | 1.26.9 | 2 |
| thoughtmachine/ | c6065ba55c72 | stdlib | 1.26.9 | 2 |
| timescale/ | 6343bdc87ca1 | stdlib | 1.26.9 | 2 |
| timescale/ | b346edcdb51a | stdlib | 1.26.9 | 2 |
| tkpd/ | 74441dadcfbd | stdlib | 1.26.9 | 2 |
| traefik/ | 200689790a0a | stdlib | 1.26.9 | 2 |