SUSE-SU-2026:1953-1: important: Security update for nginx

SLE-UPDATES null at suse.de
Mon May 18 12:30:49 UTC 2026 

# Security update for nginx

Announcement ID: SUSE-SU-2026:1953-1  
Release Date: 2026-05-18T07:53:53Z  
Rating: important  
References:

  * bsc#1243502
  * bsc#1257675
  * bsc#1260416
  * bsc#1260417
  * bsc#1260418

  
Cross-References:

  * CVE-2026-1642
  * CVE-2026-27654
  * CVE-2026-27784
  * CVE-2026-28753

  
CVSS scores:

  * CVE-2026-1642 ( SUSE ):  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
  * CVE-2026-1642 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-1642 ( NVD ):  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
  * CVE-2026-1642 ( NVD ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-27654 ( SUSE ):  8.3
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-27654 ( SUSE ):  8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
  * CVE-2026-27654 ( NVD ):  8.8
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/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
  * CVE-2026-27654 ( NVD ):  8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
  * CVE-2026-27784 ( SUSE ):  7.3
    CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-27784 ( SUSE ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-27784 ( NVD ):  8.5
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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
  * CVE-2026-27784 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-27784 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-28753 ( SUSE ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/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
  * CVE-2026-28753 ( SUSE ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
  * CVE-2026-28753 ( NVD ):  6.3
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/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
  * CVE-2026-28753 ( NVD ):  3.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

  
Affected Products:

  * openSUSE Leap 15.4
  * SUSE Linux Enterprise High Performance Computing 15 SP4
  * SUSE Linux Enterprise High Performance Computing 15 SP5
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
  * SUSE Linux Enterprise Server 15 SP4
  * SUSE Linux Enterprise Server 15 SP4 LTSS
  * SUSE Linux Enterprise Server 15 SP5
  * SUSE Linux Enterprise Server 15 SP5 LTSS
  * SUSE Linux Enterprise Server for SAP Applications 15 SP4
  * SUSE Linux Enterprise Server for SAP Applications 15 SP5

  
  
An update that solves four vulnerabilities and has one security fix can now be
installed.

## Description:

This update for nginx fixes the following issues

Security 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 DNS responses allows
    for arbitrary header injection into SMTP upstream requests (bsc#1260418).

Non security issue:

  * nginx always runs into "timed out. Killing" on shutdown when there are long-
    running processes (bsc#1243502).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP5  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-1953=1

  * SUSE Linux Enterprise Server 15 SP4 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-1953=1

  * SUSE Linux Enterprise Server 15 SP5 LTSS  
    zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-1953=1

  * openSUSE Leap 15.4  
    zypper in -t patch SUSE-2026-1953=1

  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-1953=1

  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-1953=1

  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5  
    zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-1953=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP4  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2026-1953=1

  * SUSE Linux Enterprise Server for SAP Applications 15 SP5  
    zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-1953=1

## Package List:

  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (aarch64
    x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server 15 SP4 LTSS (aarch64 ppc64le s390x x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server 15 SP4 LTSS (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server 15 SP5 LTSS (aarch64 ppc64le s390x x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server 15 SP5 LTSS (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * openSUSE Leap 15.4 (aarch64 ppc64le s390x x86_64 i586)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * openSUSE Leap 15.4 (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (aarch64
    x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (aarch64
    x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (aarch64
    x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP4 (ppc64le x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP4 (noarch)
    * nginx-source-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP5 (ppc64le x86_64)
    * nginx-debugsource-1.21.5-150400.3.15.1
    * nginx-1.21.5-150400.3.15.1
    * nginx-debuginfo-1.21.5-150400.3.15.1
  * SUSE Linux Enterprise Server for SAP Applications 15 SP5 (noarch)
    * nginx-source-1.21.5-150400.3.15.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-1642.html
  * https://www.suse.com/security/cve/CVE-2026-27654.html
  * https://www.suse.com/security/cve/CVE-2026-27784.html
  * https://www.suse.com/security/cve/CVE-2026-28753.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1243502
  * https://bugzilla.suse.com/show_bug.cgi?id=1257675
  * https://bugzilla.suse.com/show_bug.cgi?id=1260416
  * https://bugzilla.suse.com/show_bug.cgi?id=1260417
  * https://bugzilla.suse.com/show_bug.cgi?id=1260418

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