DEBIAN-CVE-2026-42533

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Source
https://security-tracker.debian.org/tracker/CVE-2026-42533
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42533.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-42533
Upstream
Published
2026-07-15T15:16:33Z
Modified
2026-09-18T04:00:07Z
Severity
  • 9.2 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

A vulnerability exists in NGINX Plus and NGINX Open Source when a map directive uses regex matching and a string expression references the map's regex capture variables before referencing the map output variable. Alternatively, the same result could be achieved by using a non-cacheable variable in a string expression under certain conditions. 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. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or to possibly trigger a code execution. There is no control plane exposure; this is a data plane issue only.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

References

Affected packages

Debian:12 / nginx

Package

Name
nginx
Purl
pkg:deb/debian/nginx?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.22.1-9+deb12u10

Affected versions

1.*
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
1.22.1-9+deb12u8
1.22.1-9+deb12u9

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42533.json"

Debian:13 / nginx

Package

Name
nginx
Purl
pkg:deb/debian/nginx?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.26.3-3+deb13u8

Affected versions

1.*
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
1.26.3-3+deb13u6
1.26.3-3+deb13u7

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42533.json"

Debian:14 / nginx

Package

Name
nginx
Purl
pkg:deb/debian/nginx?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.30.4-3

Affected versions

1.*
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
1.30.1-3
1.30.1-4
1.30.1-5
1.30.1-6
1.30.1-7
1.30.4-1
1.30.4-2

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-42533.json"