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Fencer Vulns
medium 5.9

CVE-2026-1642 json

NGINX vulnerability

published 2026-02-04 9 mo ago modified 2026-09-08 2 mo ago also BIT-nginx-2026-1642 , BIT-nginx-gateway-2026-1642 , EUVD-2026-5498

cvss
5.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 32%
public exploits
0
none known

Summary

A vulnerability exists in NGINX OSS and NGINX Plus when configured to proxy to upstream Transport Layer Security (TLS) servers. An attacker with a man-in-the-middle (MITM) position on the upstream server side—along with conditions beyond the attacker's control—may be able to inject plain text data into the response from an upstream proxied server.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Patch / fix

  • bitnami nginx 1.28.4, 1.29.5
  • bitnami nginx-gateway 1.29.5
  • F5 NGINX Open Source 1.28.2, 1.29.5
  • F5 NGINX Plus R32 P4, R35 P1, R36 P2
  • nginx Debian 12 1.22.1-9+deb12u4
  • nginx Debian 13 1.26.3-3+deb13u2
  • nginx Debian 14 1.28.1-3

debian advisories DEBIAN-CVE-2026-1642

  • nginx Ubuntu 22.04 LTS 1.18.0-6ubuntu14.8
  • nginx Ubuntu 24.04 LTS 1.24.0-2ubuntu7.6
  • nginx Ubuntu 25.10 1.28.0-6ubuntu1.1
  • nginx Ubuntu 26.04 LTS 1.28.1-3ubuntu1
  • nginx Ubuntu Pro 14.04 LTS 1.4.6-1ubuntu3.9+esm6
  • nginx Ubuntu Pro 16.04 LTS 1.10.3-0ubuntu0.16.04.5+esm7
  • nginx Ubuntu Pro 18.04 LTS 1.14.0-0ubuntu1.11+esm2
  • nginx Ubuntu Pro 20.04 LTS 1.18.0-0ubuntu1.7+esm1

ubuntu advisories UBUNTU-CVE-2026-1642

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx hummingbird 1 1.30.0-1.hum1
  • nginx-core hummingbird 1 1.30.0-1.hum1
  • nginx-mod-mail hummingbird 1 1.30.0-1.hum1
  • nginx-filesystem hummingbird 1 1.30.0-1.hum1
  • nginx-mod-stream hummingbird 1 1.30.0-1.hum1
  • nginx-all-modules hummingbird 1 1.30.0-1.hum1
  • nginx-mod-http-perl hummingbird 1 1.30.0-1.hum1
  • nginx-mod-http-geoip hummingbird 1 1.30.0-1.hum1

red hat advisories RHSA-2026:8346RHSA-2026:6427RHSA-2026:6408RHSA-2026:6407RHSA-2026:6311RHSA-2026:6302

  • nginx openSUSE Tumbleweed 1.29.5-1.1

opensuse advisories openSUSE-SU-2026:10158-1

  • nginx AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-mod-mail AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-filesystem AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-mod-stream AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-all-modules AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-mod-http-perl AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-mod-http-xslt-filter AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1
  • nginx-mod-http-image-filter AlmaLinux 8 1:1.24.0-2.module_el8.10.0+4143+ec3e7d32.alma.1

almalinux advisories ALSA-2026:5581ALSA-2026:5599ALSA-2026:4705ALSA-2026:4235ALSA-2026:3638

  • nginx Rocky Linux 8 1:1.24.0-2.module+el8.10.0+40137+188e04f4
  • nginx Rocky Linux 10 2:1.26.3-2.el10_1
  • nginx Rocky Linux 9 2:1.26.3-2.module+el9.7.0+40103+2443f6d1
  • nginx Rocky Linux 9 1:1.24.0-5.module+el9.7.0+40088+99dbd8cd.1.rocky.0.1

rocky linux advisories RLSA-2026:5581RLSA-2026:4705RLSA-2026:4235RLSA-2026:3638

  • nginx Alpine 3.24, Alpine 3.23, Alpine 3.22 1.28.2-r0

alpine advisories ALPINE-CVE-2026-1642

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nginx Azure Linux 3.0 1.28.2-1
  • nginx CBL-Mariner 2.0 1.22.1-15

azure linux advisories AZL-76706AZL-76745

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-1642 updated cvss 5.9

nginx: NGINX: Data injection via man-in-the-middle attack on TLS proxied connections

  • Red Hat Lightspeed proxy 1 insights-proxy/insights-proxy-container-rhel9
    affected: workaround, no fix available
  • Red Hat CodeReady Linux Builder EUS (v.9.4) nginx-debuginfo 1.20.1-16.el9_4.4, nginx-mod-devel 1.20.1-16.el9_4.4, nginx-debugsource 1.20.1-16.el9_4.4, nginx-core-debuginfo 1.20.1-16.el9_4.4, nginx-mod-mail-debuginfo 1.20.1-16.el9_4.4, nginx-mod-stream-debuginfo 1.20.1-16.el9_4.4, +3 more
    fixed: vendor fix RHSA-2026:6234
  • Red Hat CodeReady Linux Builder EUS (v.9.6) nginx-mod-devel 1.20.1-22.el9_6.4
    fixed: vendor fix RHSA-2026:6182
  • Red Hat Discovery 2 discovery 1773273070
    fixed: vendor fix RHSA-2026:4501
  • Red Hat Enterprise Linux AppStream (v. 8) nginx 1.24.0-2.module+el8.10.0+24013+f603d2af, nginx-mod-mail 1.24.0-2.module+el8.10.0+24013+f603d2af, nginx-filesystem 1.24.0-2.module+el8.10.0+24013+f603d2af, nginx-mod-stream 1.24.0-2.module+el8.10.0+24013+f603d2af, nginx-all-modules 1.24.0-2.module+el8.10.0+24013+f603d2af, nginx-mod-http-perl 1.24.0-2.module+el8.10.0+24013+f603d2af, +2 more
    fixed: vendor fix RHSA-2026:5581
  • Red Hat Enterprise Linux AppStream (v. 9) nginx 1.20.1-24.el9_7.1, nginx-core 1.20.1-24.el9_7.1, nginx-mod-mail 1.20.1-24.el9_7.1, nginx-filesystem 1.20.1-24.el9_7.1, nginx-mod-stream 1.20.1-24.el9_7.1, nginx-all-modules 1.20.1-24.el9_7.1, +21 more
    fixed: vendor fix RHSA-2026:3638
  • Red Hat Enterprise Linux AppStream (v. 10) nginx 1.26.3-2.el10_1, nginx-core 1.26.3-2.el10_1, nginx-mod-mail 1.26.3-2.el10_1, nginx-filesystem 1.26.3-2.el10_1, nginx-mod-stream 1.26.3-2.el10_1, nginx-all-modules 1.26.3-2.el10_1, +3 more
    fixed: vendor fix RHSA-2026:4705
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) nginx 1.20.1-10.el9_0.2, nginx-mod-mail 1.20.1-10.el9_0.2, nginx-filesystem 1.20.1-10.el9_0.2, nginx-mod-stream 1.20.1-10.el9_0.2, nginx-all-modules 1.20.1-10.el9_0.2, nginx-mod-http-perl 1.20.1-10.el9_0.2, +2 more
    fixed: vendor fix RHSA-2026:6408
show 10 more
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) nginx 1.20.1-14.el9_2.4, nginx-core 1.20.1-14.el9_2.4, nginx-mod-mail 1.20.1-14.el9_2.4, nginx-filesystem 1.20.1-14.el9_2.4, nginx-mod-stream 1.20.1-14.el9_2.4, nginx-all-modules 1.20.1-14.el9_2.4, +3 more
    fixed: vendor fix RHSA-2026:6235
  • Red Hat Enterprise Linux AppStream EUS (v. 10.0) nginx 1.26.3-1.el10_0.3, nginx-core 1.26.3-1.el10_0.3, nginx-mod-mail 1.26.3-1.el10_0.3, nginx-filesystem 1.26.3-1.el10_0.3, nginx-mod-stream 1.26.3-1.el10_0.3, nginx-all-modules 1.26.3-1.el10_0.3, +3 more
    fixed: vendor fix RHSA-2026:6311
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) nginx 1.20.1-16.el9_4.4, nginx-core 1.20.1-16.el9_4.4, nginx-mod-mail 1.20.1-16.el9_4.4, nginx-filesystem 1.20.1-16.el9_4.4, nginx-mod-stream 1.20.1-16.el9_4.4, nginx-all-modules 1.20.1-16.el9_4.4, +12 more
    fixed: vendor fix RHSA-2026:6234
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) nginx 1.20.1-22.el9_6.4, nginx-core 1.20.1-22.el9_6.4, nginx-mod-mail 1.20.1-22.el9_6.4, nginx-filesystem 1.20.1-22.el9_6.4, nginx-mod-stream 1.20.1-22.el9_6.4, nginx-all-modules 1.20.1-22.el9_6.4, +21 more
    fixed: vendor fix RHSA-2026:6302
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) nginx-debuginfo 1.20.1-24.el9_7.1, nginx-mod-devel 1.20.1-24.el9_7.1, nginx-debugsource 1.20.1-24.el9_7.1, nginx-core-debuginfo 1.20.1-24.el9_7.1, nginx-mod-mail-debuginfo 1.20.1-24.el9_7.1, nginx-mod-stream-debuginfo 1.20.1-24.el9_7.1, +3 more
    fixed: vendor fix RHSA-2026:5599
  • Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) nginx-debuginfo 1.26.3-2.el10_1, nginx-mod-devel 1.26.3-2.el10_1, nginx-debugsource 1.26.3-2.el10_1, nginx-core-debuginfo 1.26.3-2.el10_1, nginx-mod-mail-debuginfo 1.26.3-2.el10_1, nginx-mod-stream-debuginfo 1.26.3-2.el10_1, +3 more
    fixed: vendor fix RHSA-2026:4705
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) nginx-debuginfo 1.26.3-1.el10_0.3, nginx-mod-devel 1.26.3-1.el10_0.3, nginx-debugsource 1.26.3-1.el10_0.3, nginx-core-debuginfo 1.26.3-1.el10_0.3, nginx-mod-mail-debuginfo 1.26.3-1.el10_0.3, nginx-mod-stream-debuginfo 1.26.3-1.el10_0.3, +3 more
    fixed: vendor fix RHSA-2026:6311
  • Red Hat Hardened Images nginx 1.30.0-1.hum1, nginx-all-modules 1.30.0-1.hum1
    fixed: vendor fix RHSA-2026:8346
  • Red Hat Update Infrastructure 5 rhui5 1773670073, rhui5 1776868842
    fixed: vendor fix RHSA-2026:4943
  • Red Hat CodeReady Linux Builder EUS (v.9.6) nginx-debuginfo 1.20.1-22.el9_6.4, nginx-debugsource 1.20.1-22.el9_6.4, nginx-core-debuginfo 1.20.1-22.el9_6.4, nginx-mod-mail-debuginfo 1.20.1-22.el9_6.4, nginx-mod-stream-debuginfo 1.20.1-22.el9_6.4, nginx-mod-http-perl-debuginfo 1.20.1-22.el9_6.4, +2 more Red Hat Discovery 2 discovery 1773273243 Red Hat Enterprise Linux AppStream EUS (v.9.6) nginx-debuginfo 1.20.1-22.el9_6.4, nginx-debugsource 1.20.1-22.el9_6.4, nginx-core-debuginfo 1.20.1-22.el9_6.4, nginx-mod-mail-debuginfo 1.20.1-22.el9_6.4, nginx-mod-stream-debuginfo 1.20.1-22.el9_6.4, nginx-mod-http-perl-debuginfo 1.20.1-22.el9_6.4, +2 more Red Hat Update Infrastructure 5 rhui5 1773668803, rhui5 1773670137, rhui5 1773672059, rhui5 1776868744, rhui5 1776868772, rhui5 1776868774
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
9 mo ago

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 32% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CNA 4.0 8.2 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/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

Affected packages

ecosystem package affected fixed in
bitnami nginx
>=1.3.0, <1.28.4
>=1.29.4, <1.29.5
1.28.4
1.29.5
bitnami nginx-gateway
>=1.3.0, <1.29.5
1.29.5

Affected products

  • F5 NGINX Open Source
  • F5 NGINX Plus

Classification

Weakness
  • CWE-349 Acceptance of Extraneous Untrusted Data With Trusted Data
  • CWE-345 Insufficient Verification of Data Authenticity
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.