NGINX JavaScript has a vulnerability when the js_fetch_proxy directive is configured with at least one client-controlled NGINX variable (for example, $http_*, $arg_*, $cookie_*) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR) disabled, code execution is possible.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Metrics
Affected Vendors & Products
References
| Link | Providers |
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| https://my.f5.com/manage/s/article/K000161307 |
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History
Tue, 19 May 2026 15:30:00 +0000
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ssvc
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Tue, 19 May 2026 14:30:00 +0000
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| Description | NGINX JavaScript has a vulnerability when the js_fetch_proxy directive is configured with at least one client-controlled NGINX variable (for example, $http_*, $arg_*, $cookie_*) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, for systems with Address Space Layout Randomization (ASLR) disabled, code execution is possible. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated. | |
| Title | NGINX JavaScript vulnerability | |
| Weaknesses | CWE-122 | |
| References |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: f5
Published:
Updated: 2026-05-19T14:41:17.101Z
Reserved: 2026-05-15T20:10:29.764Z
Link: CVE-2026-8711
Updated: 2026-05-19T14:41:13.238Z
Status : Awaiting Analysis
Published: 2026-05-19T15:16:33.017
Modified: 2026-05-19T17:57:25.143
Link: CVE-2026-8711
No data.
OpenCVE Enrichment
Updated: 2026-05-19T15:30:08Z