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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: nginx: CVE-2026-9256
Message-ID: <177947869262.934623.14090766234631431807.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0
Date: Fri, 22 May 2026 21:38:12 +0200
Delivered-To: submit@bugs.debian.org

Source: nginx
Version: 1.30.1-2
Severity: grave
Tags: security upstream
Justification: user security hole
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for nginx.

CVE-2026-9256[0]:
| 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.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-9256
    https://www.cve.org/CVERecord?id=CVE-2026-9256
[1] https://github.com/nginx/nginx/commit/3f135ae2eb60ce376196c898a6c7cb4d774f7068

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]