Medium severity · published May 13, 2026
CVE-2026-42926
NGINX ngx_http_proxy_v2_module vulnerability
5.8
CVSS
0.3%
EPSS
No
On KEV
Description
When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. 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:C/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NO
NGINX Open Source · F5
1.29.4 before 1.30.1 · source: vendor, NVD
NG
Nginx Gateway Fabric · F5
1.3.0 through 1.6.2; 2.0.0 through 2.6.0 · source: NVD
NI
Nginx Ingress Controller · F5
3.5.0 through 3.7.2; 4.0.0 through 4.0.1; 5.0.0 through 5.4.2 · source: NVD
NI
Nginx Instance Manager · F5
2.16.0 through 2.22.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42926
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42926
Mitigation
https://my.f5.com/manage/s/article/K000161131
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