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SUSE 2026 cpp-httplib Important Denial of Service and Injection Risks

suse
Calendar Grey May 15, 2026
Dist Suse Esm H88
Five critical vulnerabilities fixed in cpp-httplib for SUSE. Recommended updates to ensure system security.
An update that solves five vulnerabilities can now be installed.

Summary

## 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:

Topics%20covered

Topics Covered

security advisory denial of service SuSE important header injection cpp-httplib

References

* bsc#1255835

* bsc#1256518

* bsc#1259220

* bsc#1259221

* bsc#1259373

Cross-

* 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

Severity
important
Lowest
Low
Medium
High
Critical

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

Topics%20covered

Topics Covered

security advisory denial of service SuSE important header injection cpp-httplib

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