SUSE-SU-2026:21599-1: important: Security update for cpp-httplib

Fri May 15 08:32:18 UTC 2026

# Security update for cpp-httplib

Announcement ID: SUSE-SU-2026:21599-1  
Release Date: 2026-05-08T10:00:52Z  
Rating: important  
References:

  * bsc#1255835
  * bsc#1256518
  * bsc#1259220
  * bsc#1259221
  * bsc#1259373

Cross-References:

  * CVE-2026-21428
  * CVE-2026-22776
  * CVE-2026-28434
  * CVE-2026-28435
  * CVE-2026-29076

CVSS scores:

  * CVE-2026-21428 ( SUSE ):  8.7 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N
  * CVE-2026-21428 ( NVD ):  7.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/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-2026-21428 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2026-22776 ( SUSE ):  7.1
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-22776 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
  * CVE-2026-22776 ( NVD ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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-2026-22776 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-28434 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-28434 ( SUSE ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-28434 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-28435 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-28435 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-28435 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-29076 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-29076 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-29076 ( NVD ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

An update that solves five vulnerabilities can now be installed.

## Description:

This update for cpp-httplib fixes the following issues

  * CVE-2026-21428: server-side request forgery via header injection
    (bsc#1255835).
  * CVE-2026-22776: unsafe handling of compressed HTTP request can cause a
    denial of service (bsc#1256518).
  * CVE-2026-28434: default exception handler may leak e.what() to clients via
    EXCEPTION_WHAT response header (bsc#1259221).
  * CVE-2026-28435: payload size limit bypass via gzip decompression in
    ContentReader (streaming) can lead to denial of service (bsc#1259220).
  * CVE-2026-29076: denial of service via crafted HTTP POST request
    (bsc#1259373).

## 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 Server 16.0  
    zypper in -t patch SUSE-SLES-16.0-724=1

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-724=1

## Package List:

  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * libcpp-httplib0_22-debuginfo-0.22.0-160000.5.1
    * cpp-httplib-debugsource-0.22.0-160000.5.1
    * libcpp-httplib0_22-0.22.0-160000.5.1
  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * libcpp-httplib0_22-debuginfo-0.22.0-160000.5.1
    * cpp-httplib-debugsource-0.22.0-160000.5.1
    * libcpp-httplib0_22-0.22.0-160000.5.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-21428.html
  * https://www.suse.com/security/cve/CVE-2026-22776.html
  * https://www.suse.com/security/cve/CVE-2026-28434.html
  * https://www.suse.com/security/cve/CVE-2026-28435.html
  * https://www.suse.com/security/cve/CVE-2026-29076.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1255835
  * https://bugzilla.suse.com/show_bug.cgi?id=1256518
  * https://bugzilla.suse.com/show_bug.cgi?id=1259220
  * https://bugzilla.suse.com/show_bug.cgi?id=1259221
  * https://bugzilla.suse.com/show_bug.cgi?id=1259373

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