CVE-2026-34059: Apache HTTP Server: mod_proxy_ajp: Heap Over-Read and memory disclosure in ajp_parse_data()
CSIRTS triage
- What
- Heap over-read and memory disclosure in mod_proxy_ajp ajp_parse_data() function.
- Who is affected
- Apache HTTP Server deployments using mod_proxy_ajp module for AJP protocol forwarding.
- Urgency
- High severity (CVSS 7.5); memory disclosure can leak sensitive data from heap.
- Action
- Update Apache HTTP Server to patched version when available.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34059
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-340590.39% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 32% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-34059 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[UPDATE] [high] Apache HTTP Server: Multiple vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in Tenable products (August 4, 2026)cert-fr-avis
- unknownMultiple vulnerabilities in Tenable Security Center (July 21, 2026)cert-fr-avis
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