High severity · published Sep 2, 2026
CVE-2026-78222
NGINX ngx_http_js_module vulnerability
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 50% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NJ
NGINX JavaScript · F5
0.5.1 before 1.0.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78222
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78222
my.f5.com
https://my.f5.com/manage/s/article/K000162603
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