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QSN-8563-4: nginx regression

August 19, 2026

Summary

USN-8563-3 introduced a regression in nginx

Details

USN-8563-3 fixed a vulnerability in nginx. The fix introduced a regression in certain environments. This update reverts the fix for CVE-2026-42533 pending further investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that nginx incorrectly handled certain map directives using regex matching and capture variables. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-42533)

It was discovered that nginx had a use-after-free vulnerability in the ngx_http_ssi_module module when configured with Server-Side Includes, proxy_pass, and proxy buffering disabled directives. An attacker able to intercept traffic and control responses from an upstream server could possibly use this issue to cause nginx to crash, resulting in a denial of service. (CVE-2026-56434)

It was discovered that nginx incorrectly handled certain requests in the ngx_http_slice_module module. A remote attacker could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-60005)

Affected QuantaStor releases

ReleasePlatformPackageExposureShipped versionFixed versionStatus
6.9.1.001Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.221.18.0-6ubuntu14.20Fixed in this release
6.9.1.001Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.221.18.0-6ubuntu14.20Fixed in this release
6.9.1.001Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.221.18.0-6ubuntu14.20Fixed in this release
6.9.1.001Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.221.18.0-6ubuntu14.20Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.211.18.0-6ubuntu14.20Fixed in this release
6.9.0.464Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.211.18.0-6ubuntu14.20Fixed in this release
6.9.0.464Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.211.18.0-6ubuntu14.20Fixed in this release
6.9.0.464Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.211.18.0-6ubuntu14.20Fixed in this release
6.8.6.015Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.201.18.0-6ubuntu14.20Fixed in this release
6.8.6.015Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.201.18.0-6ubuntu14.20Fixed in this release
6.8.6.015Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.201.18.0-6ubuntu14.20Fixed in this release
6.8.6.015Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.201.18.0-6ubuntu14.20Fixed in this release
6.8.5.018Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.5.018Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.4.038Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.3.018Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.2.002Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.181.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.1.007Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibnginx-mod-http-echoExternally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSlibnginx-mod-http-geoip2Externally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSnginx-commonInternally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update
6.8.0.205Ubuntu 22.04 LTSnginx-lightExternally-facing1.18.0-6ubuntu14.161.18.0-6ubuntu14.20Fixed by QuantaStor security update

Internally-facing: only accessible when logged into the QuantaStor console/ssh as the qadmin administrative sudo user; generally lower priority. Externally-facing: part of a service the storage platform presents on the network (or the kernel), so potentially reachable over the network.

References

https://ubuntu.com/security/notices/USN-8563-4

https://bugs.launchpad.net/bugs/2164558

Update

Fixes marked Fixed by QuantaStor security update are applied by upgrading QuantaStor with security patches included (Upgrade Manager). Fixed package versions:

PlatformPackageVersion
Ubuntu 22.04 LTSnginx1.18.0-6ubuntu14.20
Ubuntu 24.04 LTSnginx1.24.0-2ubuntu7.17
resolutenginx1.28.3-2ubuntu1.10