Out-of-bounds Read vulnerability in mod_proxy_ajp of
Apache HTTP Server.
This issue affects Apache HTTP Server: through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
Score 5.3 from GitHub Security Advisory published 2026-05-04. NVD baseline CVSS 5.3; sources differ by 0.0.
A fix is available — apply it.
Out-of-bounds Read vulnerability in mod_proxy_ajp of
Apache HTTP Server.
This issue affects Apache HTTP Server: through 2.4.66.
Users are recommended to upgrade to version 2.4.67, which fixes the issue.
May 4, 2026
May 4, 2026
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP4 security update
Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP4 security update
Red Hat Security Advisory: httpd:2.4 security update
Red Hat Security Advisory: httpd security update
Red Hat Security Advisory: httpd security update
Apache HTTP Server: Off-by-one OOB reads in AJP getter functions
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| ubuntu | apache2-utils (2.4.66-2ubuntu2.1) @ resolute | 2026-06-14 | ubuntu |
| redhat | httpd:2.4-8100020260519200905.489197e6 | 2026-06-01 | redhat |
| redhat | httpd-0:2.4.63-13.el10_2.1 | 2026-05-27 | redhat |
| redhat | httpd-0:2.4.62-13.el9_8.1 | 2026-05-27 | redhat |
| redhat | httpd-main-2.4.67-0.1.hum1 | 2026-05-06 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Showing the most recent 100 of 115 total refreshes for this CVE.
Explore the affected products and dependency analysis for CVE-2026-33857
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.