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
- 5,295
- of 18,117 indexed, latest versions
- Container images
- 6,105
- 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 5,295 of 18,117 indexed charts deploy, on 6,105 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 | 6,105 |
| golang-1.19deb | 1.19.8-2 | no fix listed | 1 |
- OSV records
- DEBIAN-CVE-2026-56866GO-2026-6605
- Trending
- Rank 9 in indexed charts, since 9 Oct 2026. See the ranking →
Charts affected
5,295 by stars
Container images carrying it
6,105 by charts deploying them
A fixed version is listed for 1 of the 2 affected packages.
| Container image | Digest | Package | Fixed in | Used by |
|---|---|---|---|---|
| hibiken/ | ac80bcffd2f9 | stdlib | 1.26.9 | 1 |
| hipages/ | 9b5be9d3d955 | stdlib | 1.26.9 | 1 |
| hivemq/ | a919f990141b | stdlib | 1.26.9 | 1 |
| hivemq/ | 8d5f6a6f48b0 | stdlib | 1.26.9 | 1 |
| hiversh/ | 0e36d98402bc | stdlib | 1.26.9 | 1 |
| hiversh/ | b5048c6342ce | stdlib | 1.26.9 | 1 |
| hiversh/ | 2fbf9f264498 | stdlib | 1.26.9 | 1 |
| hiversh/ | 4f43130f51e5 | stdlib | 1.26.9 | 1 |
| hiversh/ | b0b85f8942c7 | stdlib | 1.26.9 | 1 |
| hiversh/ | 50c07b84f298 | stdlib | 1.26.9 | 1 |
| hiversh/ | 836a37641941 | stdlib | 1.26.9 | 1 |
| hiversh/ | 958b7ebb4eb4 | stdlib | 1.26.9 | 1 |
| hiversh/ | 63a5ae179a9f | stdlib | 1.26.9 | 1 |
| hkotel/ | 3c04c0e85039 | stdlib | 1.26.9 | 1 |
| holiman/ | 5cd609761065 | stdlib | 1.26.9 | 1 |
| holoinsight/ | 5c3994e742f8 | stdlib | 1.26.9 | 1 |
| holoinsight/ | 42ba8dc3113c | stdlib | 1.26.9 | 1 |
| homeassistant/ | 021e2afc6e57 | stdlib | 1.26.9 | 1 |
| homeassistant/ | 565751f33794 | stdlib | 1.26.9 | 1 |
| homeassistant/ | 5a531753cea9 | stdlib | 1.26.9 | 1 |
| homeassistant/ | 8d000332b09b | stdlib | 1.26.9 | 1 |
| honeycombio/ | 44bfbb103ebb | stdlib | 1.26.9 | 1 |
| honglab/ | ca075a926fe1 | stdlib | 1.26.9 | 1 |
| hoppscotch/ | 538fe6ded4b6 | stdlib | 1.26.9 | 1 |
| hoppscotch/ | e7ba6061a286 | stdlib | 1.26.9 | 1 |
| huacnlee/ | 560be93229a5 | stdlib | 1.26.9 | 1 |
| huacnlee/ | d9c693e99576 | stdlib | 1.26.9 | 1 |
| huangchengwu6904/ | 1b932f8221a9 | stdlib | 1.26.9 | 1 |
| huseyinbabal/ | ae8eb4053c60 | stdlib | 1.26.9 | 1 |
| huzafach/ | 6e271d43ea48 | stdlib | 1.26.9 | 1 |
| hyperledger/ | c7f3422ec1d5 | stdlib | 1.26.9 | 1 |
| hyperledger/ | f270dfeee91d | stdlib | 1.26.9 | 1 |
| hyperledger/ | 37294e05209b | stdlib | 1.26.9 | 1 |
| hyperledger/ | bf4995c86af6 | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | 1f1a06b61f18 | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | d8bc31176257 | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | 29a8af8be270 | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | 729b3d128487 | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | ed0b0c56f1ea | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | d0a3a35a138d | stdlib | 1.26.9 | 1 |
| hyperledgerk8s/ | 2237cb80f52b | stdlib | 1.26.9 | 1 |
| iamdorsah/ | db83a0254d81 | stdlib | 1.26.9 | 1 |
| ianw/ | dc49dd460c37 | stdlib | 1.26.9 | 1 |
| ibarreche/ | 1f45af91da6a | stdlib | 1.26.9 | 1 |
| igrantio/ | 2d2ea6546ffe | stdlib | 1.26.9 | 1 |
| ildarmukhametzyanov/ | 15d23720a3ee | stdlib | 1.26.9 | 1 |
| inaccel/ | a5d3d0af05c1 | stdlib | 1.26.9 | 1 |
| inaccel/ | 44b4f274f40b | stdlib | 1.26.9 | 1 |
| inaccel/ | bdfd61803a70 | stdlib | 1.26.9 | 1 |
| inbucket/ | 1f10a0efea69 | stdlib | 1.26.9 | 1 |