High [CVE-2026-78222] vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch can crash an NGINX worker when trusted JavaScript reads Response.statusText
This high-severity F5 advisory covers CVE-2026-78222 affecting NGINX JavaScript.
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Summary
A vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch() can crash an NGINX worker when trusted JavaScript reads Response.statusText. Exploitation requires control or influence over the fetched HTTP response.
Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system.
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.
- NGINX JavaScript 0.5.1 before 1.0.1
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 1.0.1. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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