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CVE-2026-43951 is a moderate-severity out-of-bounds read vulnerability in Apache HTTP Server affecting versions 2.4.0 through 2.4.67. The flaw occurs in the merge_response_headers processing path when mod_headers and mod_mime are used in conjunction with multiple response languages. Under these conditions, incorrect bounds handling can trigger an out-of-bounds read in merge_response_headers, leading to child process crashes. The issue was fixed in Apache HTTP Server 2.4.68.
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No public exploit code observed for this vulnerability.
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14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting IBM HTTP Server configurations serving non-WebSphere local content with AddLanguage or mod_negotiation enabled.
An out-of-bounds read vulnerability in Apache HTTP Server merge_response_headers involving mod_headers and mod_mime that can cause child process crashes.
A vulnerability addressed in the Apache HTTP Server 2.4.68 security update.
Apache HTTP Server vulnerability affecting mod_headers and mod_mime, fixed in 2.4.68; exact impact is unclear due to encoding issues.
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.