CVE-2026-40701
Publication date 13 May 2026
Last updated 2 June 2026
Ubuntu priority
Description
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module module when the ssl_verify_client directive is set to "on" or "optional," and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| nginx | 26.04 LTS resolute |
Fixed 1.28.3-2ubuntu1.2
|
| 25.10 questing |
Fixed 1.28.0-6ubuntu1.4
|
|
| 24.04 LTS noble |
Fixed 1.24.0-2ubuntu7.9
|
|
| 22.04 LTS jammy |
Fixed 1.18.0-6ubuntu14.12
|
|
| 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 |
4.8 · Medium
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | Low |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-8354-1
- nginx vulnerabilities
- 1 June 2026
- USN-8375-1
- nginx vulnerabilities
- 3 June 2026