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CVE-2026-28755

NGINX ngx_stream_ssl_module vulnerability

5.3 MediumPublic exploitFix available

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

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
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.14%Up 0.1 points since Mar 25, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.3

NGINX ngx_stream_ssl_module vulnerability

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
CVE-2026-28755
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
EUVDEUVD-2026-14887 5.3

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
EUVD-2026-14887
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-hgfr-jmpr-2p89 5.3

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to...

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
GHSA-hgfr-jmpr-2p89
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
NVD 5.3

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
CVE-2026-28755
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/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
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-863
Updated
2026-11-02
OSVALPINE-CVE-2026-28755 5.4

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
ALPINE-CVE-2026-28755
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVBELL-CVE-2026-28755 5.4
Record
BELL-CVE-2026-28755
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
Show 11 moreShow less
OSV 5.4

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
CVE-2026-28755
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2026-28755 5.4

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.   Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
DEBIAN-CVE-2026-28755
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVRHSA-2026:8346 8.2

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

Record
RHSA-2026:8346
CVSS 3.1
8.2 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-28755 5.3

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
UBUNTU-CVE-2026-28755
CVSS 4.0
5.3 MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-02
OSVAZL-80783 No score

CVE-2026-28755 affecting package nginx for versions less than 1.28.3-1

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
AZL-80783
Updated
2026-11-02
OSVBIT-nginx-2026-28755 No score

NGINX ngx_stream_ssl_module vulnerability

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
BIT-nginx-2026-28755
Updated
2026-11-02
OSVBIT-nginx-gateway-2026-28755 No score

NGINX ngx_stream_ssl_module vulnerability

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_stream_ssl_module module due to the improper handling of revoked certificates when configured with the ssl_verify_client on and ssl_ocsp on directives, allowing the TLS handshake to succeed even after an OCSP check identifies the certificate as revoked.  

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Record
BIT-nginx-gateway-2026-28755
Updated
2026-11-02
OSVMGASA-2026-0111 No score

Updated nginx packages fix security vulnerabilities

Buffer overflow in ngx_http_dav_module (CVE-2026-27654) Buffer overflow in the ngx_http_mp4_module (CVE-2026-27784) Buffer overflow in the ngx_http_mp4_module (CVE-2026-32647) NULL pointer dereference while using CRAM-MD5 or APOP (CVE-2026-27651) Injection in auth_http and XCLIENT (CVE-2026-28753) OCSP result bypass in stream (CVE-2026-28755)

Record
MGASA-2026-0111
Updated
2026-11-02
OSVopenSUSE-SU-2026:10423-1 No score

nginx-1.29.7-1.1 on GA media

These are all security issues fixed in the nginx-1.29.7-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10423-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20784-1 No score

Security update for nginx

This update for nginx fixes the following issues:

  • CVE-2026-1642: plain text data injection into the response from an upstream proxied server (bsc#1257675).
  • CVE-2026-27654: buffer overflow in the NGINX worker process via the ngx_http_dav_module module (bsc#1260416).
  • CVE-2026-27784: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260417).
  • CVE-2026-28753: improper handling onf CRLF sequences in CRLF responses allows for arbitrary header injection into SMTP upstream requests (bsc#1260418).
  • CVE-2026-28755: TLS handshakes can succeed with revoked certificates due to improper handling of such certificates by the ngx_stream_ssl_module module (bsc#1260419).
Record
openSUSE-SU-2026:20784-1
Updated
2026-11-02
OSVSUSE-SU-2026:21823-1 No score

Security update for nginx

This update for nginx fixes the following issues:

  • CVE-2026-1642: plain text data injection into the response from an upstream proxied server (bsc#1257675).
  • CVE-2026-27654: buffer overflow in the NGINX worker process via the ngx_http_dav_module module (bsc#1260416).
  • CVE-2026-27784: NGINX worker memory over-read or over-write via a specially crafted MP4 file (bsc#1260417).
  • CVE-2026-28753: improper handling onf CRLF sequences in CRLF responses allows for arbitrary header injection into SMTP upstream requests (bsc#1260418).
  • CVE-2026-28755: TLS handshakes can succeed with revoked certificates due to improper handling of such certificates by the ngx_stream_ssl_module module (bsc#1260419).
Record
SUSE-SU-2026:21823-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nginx
Alpine:v3.22
 before 1.28.3-r0
1.28.3-r0
nginx
Alpine:v3.23
 before 1.28.3-r0
1.28.3-r0
nginx
Alpine:v3.24
 before 1.28.3-r0
1.28.3-r0
nginx
Azure Linux:3
 before 1.28.3-1
1.28.3-1
nginx
Alpaquita:23
 1.22.1-r0 up to 1.22.1-r4
1.22.1-r4
nginx
Alpaquita:25
 1.28.0-r3 up to 1.28.3-r0
1.28.3-r0
nginx
Alpaquita:stream
 1.22.1-r0 up to 1.28.3-r0
1.28.3-r0
nginx
Bitnami
 1.27.2 up to 1.28.3, 1.29.0 up to 1.29.7
1.28.31.29.7
nginx-gateway
Bitnami
 1.27.2 up to 1.28.3, 1.29.0 up to 1.29.7
1.28.31.29.7
nginx
Debian:14
 before 1.28.3-2, plus listed versions
1.26.3-31.28.0-11.28.0-21.28.0-31.28.0-4
Show 10 moreShow less
1.28.0-51.28.0-61.28.1-11.28.1-21.28.1-31.28.2-11.28.2-21.28.2-31.28.2-41.28.3-1
1.28.3-2
Show 16 moreShow less
Affected packages
PackageAffectedFixed
nginx
Mageia:9
From an advisory covering 6 CVEs
 before 1.29.7-1.mga9
1.29.7-1.mga9
nginx
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-all-modules
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-core
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-filesystem
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-devel
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-http-geoip
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-http-image-filter
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-http-perl
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-http-xslt-filter
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-mail
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-stream
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx-mod-stream-geoip
Red Hat:hummingbird:1
From an advisory covering 8 CVEs
 before 0:1.30.0-1.hum1
0:1.30.0-1.hum1
nginx
Ubuntu:24.04:LTS
 before 1.24.0-2ubuntu7.7, plus listed versions
1.24.0-1ubuntu11.24.0-2ubuntu11.24.0-2ubuntu21.24.0-2ubuntu31.24.0-2ubuntu4
Show 7 moreShow less
1.24.0-2ubuntu61.24.0-2ubuntu71.24.0-2ubuntu7.11.24.0-2ubuntu7.31.24.0-2ubuntu7.41.24.0-2ubuntu7.51.24.0-2ubuntu7.6
1.24.0-2ubuntu7.7
nginx
Ubuntu:25.10
 before 1.28.0-6ubuntu1.2, plus listed versions
1.26.3-2ubuntu11.26.3-3ubuntu11.26.3-3ubuntu21.26.3-3ubuntu31.28.0-3ubuntu11.28.0-4ubuntu11.28.0-6ubuntu11.28.0-6ubuntu1.1
1.28.0-6ubuntu1.2
nginx
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 1.29.7-1.1
1.29.7-1.1

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubChPratik/NGINX_2026_CVE_Bundle_CTI_Report2026-07-28

History

History
RecordedChangedSources
affected, facts
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-2026-28755 is a medium vulnerability (CVSS 5.3) in F5 Nginx Open Source, published March 24, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 3rd percentile. Fixed in nginx 1.28.3-r0.

References

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