CVE-2026-42926
Publication date 13 May 2026
Last updated 21 May 2026
Ubuntu priority
Description
When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| nginx | 26.04 LTS resolute |
Needs evaluation
|
| 25.10 questing |
Needs evaluation
|
|
| 24.04 LTS noble |
Needs evaluation
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| 14.04 LTS trusty |
Needs evaluation
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
5.8 · Medium
|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity impact | Low |
| Availability impact | None |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N |
References
Other references
- https://www.cve.org/CVERecord?id=CVE-2026-42926
- https://my.f5.com/manage/s/article/K000161131
- https://nginx.org/en/security_advisories.html
- https://github.com/nginx/nginx/commit/ce3362cfd5c3e1434a6151cfa585b89114389da7 (release-1.30.1)
- https://github.com/nginx/nginx/commit/a0e742944db64d8a547cc2e7a0ba4c2e85cd4b98 (release-1.30.1)