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CVE-2026-42926

26
FAUCET Score

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.

First published: May 13, 2026Last modified: May 13, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.3.0, <= 1.6.2CPE matchmatch criteria
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
>= 1.29.4, <= 1.30.0CPE matchmatch criteria
cpe:2.3:a:f5:nginx_open_source:*:*:*:*:*:*:*:*
>= 2.0.0, <= 2.6.0CPE matchmatch criteria
cpe:2.3:a:f5:nginx_gateway_fabric:*:*:*:*:*:*:*:*
>= 2.16.0, <= 2.22.0CPE matchmatch criteria
cpe:2.3:a:f5:nginx_instance_manager:*:*:*:*:*:*:*:*
>= 3.5.0, <= 3.7.2CPE matchmatch criteria
cpe:2.3:a:f5:nginx_ingress_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

6.3MEDIUM

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
NONE
SS Confidentiality
NONE
SS Integrity
LOW
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.34%
Probability of exploitation in next 30 days
EPSS Percentile
26.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0034 is in the 16th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

my.f5.com / manage/s/article/K000161131
MitigationVendor Advisory