CVE detail
CVE-2026-9256
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 Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 28.3 · diversity 20.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 0
- within the 30d window
- Peak daily
- 0
- highest bucket
Evidence
Source links by recency
16 source links · newest first
Information published.
vendormsrc.microsoft.comMay 27, 2026, 8:18 AM- CVE-2026-9256: Nginx 1.31.1 and 1.30.1Hacker News
Linked URL: https://www.cve.org/CVERecord?id=CVE-2026-9256 | Posted by petecooper | 11 points | 0 comments
communitynews.ycombinator.comMay 22, 2026, 11:42 PM - https://access.redhat.com/errata/RHSA-2026:44481access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9256.jsonsecurity.access.redhat.com
No excerpt available.
Vendor Advisorysecurity.access.redhat.comMay 22, 2026, 3:16 PM - https://bugzilla.redhat.com/show_bug.cgi?id=2480746bugzilla.redhat.com
No excerpt available.
Exploitbugzilla.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/security/cve/CVE-2026-9256access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:33313access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:29874access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:29151access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:28973access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:28921access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:28212access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM - https://access.redhat.com/errata/RHSA-2026:20351access.redhat.com
No excerpt available.
Vendor Advisoryaccess.redhat.comMay 22, 2026, 3:16 PM No excerpt available.
Vendor Advisorylists.debian.orgMay 22, 2026, 3:16 PM- http://www.openwall.com/lists/oss-security/2026/05/22/14www.openwall.com
No excerpt available.
Exploitwww.openwall.comMay 22, 2026, 3:16 PM No excerpt available.
Vendor Advisorymy.f5.comMay 22, 2026, 3:16 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
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