Apache HTTP Server mod_proxy_ajp heap-based buffer over-read in ajp_parse_data()
CVE-2026-34059 is a buffer over-read vulnerability in Apache HTTP Server affecting versions through 2.4.66. The flaw is in the mod_proxy_ajp module, specifically in the ajp_parse_data() function, where malformed AJP data can trigger a heap-based buffer over-read. This can result in unintended disclosure of process memory contents. Apache characterized the issue as low severity and fixed it in Apache HTTP Server 2.4.67.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.