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CVE-2026-42926

NGINX ngx_http_proxy_v2_module vulnerability

6.3 MediumPublic exploitFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
None

Exploit likelihood

0.35%Up 0.3 points since May 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.3

NGINX ngx_http_proxy_v2_module vulnerability

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.

Record
CVE-2026-42926
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CVSS 3.1
5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-172
Updated
2026-11-02
EUVDEUVD-2026-30006 6.3

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.

Record
EUVD-2026-30006
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-v43f-895r-chhh 6.3

When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2,...

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.

Record
GHSA-v43f-895r-chhh
CVSS 4.0
6.3 MediumCVSS: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
CVSS 3.1
5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-172
Updated
2026-11-02
NVD 6.3

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.

Record
CVE-2026-42926
CVSS 4.0
6.3 MediumCVSS: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
CVSS 3.1
5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-172
Updated
2026-11-02
OSVALPINE-CVE-2026-42926 6.3

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.

Record
ALPINE-CVE-2026-42926
CVSS 4.0
6.3 MediumCVSS: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
Updated
2026-11-02
OSVBELL-CVE-2026-42926 5.8

CVE-2026-42926 does not affect BellSoft software

Record
BELL-CVE-2026-42926
CVSS 3.1
5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Updated
2026-11-02
Show 8 moreShow less
OSV 6.3

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.

Record
CVE-2026-42926
CVSS 4.0
6.3 MediumCVSS: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
Updated
2026-11-02
OSVDEBIAN-CVE-2026-42926 6.3

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.

Record
DEBIAN-CVE-2026-42926
CVSS 4.0
6.3 MediumCVSS: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
Updated
2026-11-02
OSVRHSA-2026:20351 8.1

Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Record
RHSA-2026:20351
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-42926 6.3

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.

Record
UBUNTU-CVE-2026-42926
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
CVSS 3.1
5.8 MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Updated
2026-11-02
OSVBIT-nginx-2026-42926 No score

NGINX ngx_http_proxy_v2_module vulnerability

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.

Record
BIT-nginx-2026-42926
Updated
2026-11-02
OSVBIT-nginx-gateway-2026-42926 No score

NGINX ngx_http_proxy_v2_module vulnerability

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.

Record
BIT-nginx-gateway-2026-42926
Updated
2026-11-02
OSVMGASA-2026-0156 No score

Updated nginx packages fix security vulnerabilities

NGINX ngx_quic_module vulnerability. (CVE-2026-40460) NGINX ngx_http_ssl_module vulnerability. (CVE-2026-40701) NGINX ngx_http_proxy_v2_module vulnerability. (CVE-2026-42926) NGINX ngx_http_charset_module vulnerability. (CVE-2026-42934) NGINX ngx_http_rewrite_module vulnerability. (CVE-2026-42945) NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability. (CVE-2026-42946)

Record
MGASA-2026-0156
Updated
2026-11-02
OSVopenSUSE-SU-2026:10796-1 No score

nginx-1.31.0-1.1 on GA media

These are all security issues fixed in the nginx-1.31.0-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10796-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nginx
Bitnami
 1.29.4 up to 1.30.1
1.30.1
nginx-gateway
Bitnami
 1.29.4 up to 1.30.1
1.30.1
nginx
Debian:14
 before 1.30.0-4, plus listed versions
1.26.3-31.28.0-11.28.0-21.28.0-31.28.0-4
Show 14 moreShow less
1.28.0-51.28.0-61.28.1-11.28.1-21.28.1-31.28.2-11.28.2-21.28.2-31.28.2-41.28.3-11.28.3-21.30.0-11.30.0-21.30.0-3
1.30.0-4
nginx
Mageia:9
From an advisory covering 6 CVEs
 before 1.30.1-1.mga9
1.30.1-1.mga9
nginx
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-all-modules
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-core
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-filesystem
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-devel
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-http-geoip
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
Show 7 moreShow less
Affected packages
PackageAffectedFixed
nginx-mod-http-image-filter
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-http-perl
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-http-xslt-filter
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-mail
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-stream
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx-mod-stream-geoip
Red Hat:hummingbird:1
From an advisory covering 4 CVEs
 before 0:1.30.2-1.hum1
0:1.30.2-1.hum1
nginx
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 1.31.0-1.1
1.31.0-1.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubikarolaborda/CVE2026-429262026-06-06

History

History
RecordedChangedSources
affected, facts
affected
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-42926 is a medium vulnerability (CVSS 6.3) in F5 Nginx Open Source, published May 13, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.35%, the 28th percentile. Fixed in nginx 1.30.1.

References

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