CVE-2026-56434
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Summary
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssi_module module. This vulnerability may exist when the Server-Side Includes (SSI), proxy_pass, and proxy_buffering off directives are configured. With this configuration, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to cause a use-after-free in the NGINX worker process. This issue may lead to limited modification of memory or a restart of the NGINX worker process.
Impact: This vulnerability may allow remote attackers to have limited control to modify memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| F5 | NGINX Plus | 37.0.0.1 < 37.0.3.1 | affected |
| F5 | NGINX Plus | R36 < R36 P7 | affected |
| F5 | NGINX Plus | R33 < * | affected |
| F5 | NGINX Open Source | 1.31.2 < 1.31.3 | affected |
| F5 | NGINX Open Source | 0.8.11 < 1.30.4 | affected |
Weaknesses
- CWE-416: CWE-416 Use After Free
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
References
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