DEBIAN-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.
DEBIAN-CVE-2026-9256
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-9256
nginx
Source reference: /affected/0/package/name
- Affected versions
- 1.22.1-9
Source reference:
/affected/0/versions1.22.1-9+deb12u1Source reference:
/affected/0/versions1.22.1-9+deb12u2Source reference:
/affected/0/versions1.22.1-9+deb12u3Source reference:
/affected/0/versions1.22.1-9+deb12u4Source reference:
/affected/0/versions1.22.1-9+deb12u5Source reference:
/affected/0/versions1.22.1-9+deb12u6Source reference:
/affected/0/versions1.22.1-9+deb12u7Source reference:
/affected/0/versions - Fixed versions
- 1.22.1-9+deb12u8
Source reference:
/affected/0/ranges - Prerequisites
- Not stated in this record
nginx
Source reference: /affected/1/package/name
- Affected versions
- 1.26.3-3
Source reference:
/affected/1/versions1.26.3-3+deb13u1Source reference:
/affected/1/versions1.26.3-3+deb13u2Source reference:
/affected/1/versions1.26.3-3+deb13u3Source reference:
/affected/1/versions1.26.3-3+deb13u4Source reference:
/affected/1/versions1.26.3-3+deb13u5Source reference:
/affected/1/versions - Fixed versions
- 1.26.3-3+deb13u6
Source reference:
/affected/1/ranges - Prerequisites
- Not stated in this record
nginx
Source reference: /affected/2/package/name
- Affected versions
- 1.26.3-3
Source reference:
/affected/2/versions1.28.0-1Source reference:
/affected/2/versions1.28.0-2Source reference:
/affected/2/versions1.28.0-3Source reference:
/affected/2/versions1.28.0-4Source reference:
/affected/2/versions1.28.0-5Source reference:
/affected/2/versions1.28.0-6Source reference:
/affected/2/versions1.28.1-1Source reference:
/affected/2/versions1.28.1-2Source reference:
/affected/2/versions1.28.1-3Source reference:
/affected/2/versions1.28.2-1Source reference:
/affected/2/versions1.28.2-2Source reference:
/affected/2/versions1.28.2-3Source reference:
/affected/2/versions1.28.2-4Source reference:
/affected/2/versions1.28.3-1Source reference:
/affected/2/versions1.28.3-2Source reference:
/affected/2/versions1.30.0-1Source reference:
/affected/2/versions1.30.0-2Source reference:
/affected/2/versions1.30.0-3Source reference:
/affected/2/versions1.30.0-4Source reference:
/affected/2/versions1.30.1-1Source reference:
/affected/2/versions1.30.1-2Source reference:
/affected/2/versions - Fixed versions
- 1.30.1-3
Source reference:
/affected/2/ranges - Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.22.1-9+deb12u8"
}
]
}
],
"package": {
"name": "nginx",
"purl": "pkg:deb/debian/nginx?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.22.1-9",
"1.22.1-9+deb12u1",
"1.22.1-9+deb12u2",
"1.22.1-9+deb12u3",
"1.22.1-9+deb12u4",
"1.22.1-9+deb12u5",
"1.22.1-9+deb12u6",
"1.22.1-9+deb12u7"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9256.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.26.3-3+deb13u6"
}
]
}
],
"package": {
"name": "nginx",
"purl": "pkg:deb/debian/nginx?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.26.3-3",
"1.26.3-3+deb13u1",
"1.26.3-3+deb13u2",
"1.26.3-3+deb13u3",
"1.26.3-3+deb13u4",
"1.26.3-3+deb13u5"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9256.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.30.1-3"
}
]
}
],
"package": {
"name": "nginx",
"purl": "pkg:deb/debian/nginx?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.26.3-3",
"1.28.0-1",
"1.28.0-2",
"1.28.0-3",
"1.28.0-4",
"1.28.0-5",
"1.28.0-6",
"1.28.1-1",
"1.28.1-2",
"1.28.1-3",
"1.28.2-1",
"1.28.2-2",
"1.28.2-3",
"1.28.2-4",
"1.28.3-1",
"1.28.3-2",
"1.30.0-1",
"1.30.0-2",
"1.30.0-3",
"1.30.0-4",
"1.30.1-1",
"1.30.1-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-9256.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #58578 · Revision 1
- Added to Heist Feed
- Publisher date