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cve recordhigh

CVE-2026-9256

f5 · nginx open source

Published
CVSS8.1
Severityhigh
WeaknessCWE-122
ExploitedNot in CISA KEV

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomizat

References

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Our coverage of CVE-2026-9256

CVE-2026-42533critical

Critical NGINX Vulnerability Can Crash Workers and May Allow Remote Code Execution

A critical vulnerability (CVE-2026-42533) has been discovered in NGINX, potentially allowing remote attackers to crash worker processes or even execute arbitrary code. The flaw, present in versions from 0.9.6 up to 1.31.2, arises from a specific configuration involving regex-based maps and string expressions. While F5 has released patches, researchers suggest that existing mitigations might not be entirely effective, emphasizing the need for immediate upgrades.