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mod_authn_socache

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USN-8571-2: Apache HTTP Server regression

Ubuntu issues USN-8571-2 fixing an Apache HTTP Server regression that prevented startup when HTTP/2 proxying was enabled.

Ubuntu released USN-8571-2 to fix a regression introduced by USN-8571-1 in Apache HTTP Server. The earlier fix was incomplete due to a missing library symbol, causing Apache to fail to start when HTTP/2 proxying was enabled. The original advisory addressed CVE-2026-33007, a memory-handling flaw in mod_authn_socache allowing remote denial of service, and an HTTP response splitting vulnerability affecting multiple modules, credited to Pavel Kohout, Arkadi Vainbrand, Haruki Oyama, Merih Mengisteab, and Dawit Jeong.

Ubuntu Security Noticesupdated · 4d agofirst · 5d agoAdvisory 13 sourcesCVE-2026-33007

Related CVEs

  • CVE-2026-330075.3<1%
    A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a
    A NULL pointer dereference in the mod_authn_socache in Apache HTTP Server 2.4.66 and earlier allows an unauthenticated remote user to crash a child process in a caching forward proxy configuration. Users are recommended to upgrade to version 2.4.67, which fixes this issue.
    · apache http server—

Appears with

organization Apache Software Foundation 1product Apache HTTP Server 1product Ubuntu 1vendor Apache Software Foundation 1vendor Canonical 1
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