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Critical NGINX Vulnerability CVE-2026-42533 Poses RCE and DoS Risks

Critical NGINX Vulnerability CVE-2026-42533 Poses RCE and DoS Risks

First seen 16 Jul 2026, 09:23 UTC • •
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ThreatCluster AI
ThreatCluster •July 17, 2026 at 08:28 UTC
  • •CVE-2026-42533 allows RCE and DoS attacks via crafted HTTP requests.
  • •Affected systems include both NGINX Plus and open-source versions.
  • •F5 recommends immediate upgrades to mitigate risks associated with this vulnerability.

F5 disclosed a critical vulnerability in NGINX, identified as CVE-2026-42533, which can lead to remote code execution (RCE) and denial-of-service (DoS) attacks. The flaw is a heap buffer overflow triggered by crafted HTTP requests that exploit unsafe regex processing in the map directive. This vulnerability affects both NGINX Plus and the open-source version, impacting widely used web infrastructure. Attackers can exploit this flaw if they can send specially crafted requests, potentially leading to service crashes or code execution in less secure environments. F5 has urged administrators to upgrade to fixed versions immediately and review their configurations. The vulnerability was published on July 15, 2026, following the release of a proof of concept on July 4, 2026. Other vulnerabilities were also disclosed in the same advisory, but CVE-2026-42533 is noted as particularly dangerous.

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Timeline

2026-07-04
First public PoC for CVE-2026-42533 released
A proof of concept demonstrating the exploit was made public, highlighting the vulnerability's risks.
Socprime
2026-07-15
CVE-2026-42533 published
F5 disclosed CVE-2026-42533 along with other vulnerabilities affecting NGINX.
Gbhackers
2026-07-15
F5 issues advisory for NGINX vulnerabilities
F5 urged immediate action to patch critical vulnerabilities affecting NGINX deployments.
Cybernews
2026-07-15
CVE-2026-56434 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-07-15
CVE-2026-60005 published
Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
MITRE
2026-07-16
Security community alerted to NGINX vulnerabilities
Multiple articles reported on the critical NGINX vulnerabilities, emphasizing the need for prompt updates.
Cybersecuritynews

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