Vulnerability Report

CVE-2026-42945

Title: NGINX: HTTP rewrite module heap buffer overflow

Memory Corruption

Proof Of Concept

PoC Available for CVE-2026-42945

CWE Category CWE-122
Published Date May 13, 2026
Modified Date Jun 18, 2026
Exploit Status Available
Score 9.2 CVSS v4.0
Exploit Probability (EPSS)
23.02%

Vulnerability Summary

CVE-2026-42945: NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when the rewrite directive is followed by a rewrite, if, or set directive and an unnamed Perl-Compatible Regular Expression (PCRE) capture (for example, $1, $2) with a replacement string that includes a question mark (?). An unauthenticated attacker along with conditions beyond its 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.

Impacted Vendors

K
kubernetes 1
F
f5 9

Reference Links

https://my.f5.com/manage/s/article/K000161019
CVSS v4.0
Source Entity [email protected]
Severity CRITICAL
9.2
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
N/A
RAW VECTOR 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 v3.1
Source Entity [email protected]
Severity HIGH
8.1
Attack Vector
NETWORK
Complexity
HIGH
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-42945 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/DepthFirstDisclosures/Nginx-Rift
View Code
GitHub https://github.com/RyosukeDTomita/CVE-2026-42945
View Code
GitHub https://github.com/p3Nt3st3r-sTAr/CVE-2026-42945-POC
View Code
GitHub https://github.com/friparia/NGINX_RIFT_SCAN_CVE_2026_42945
View Code
GitHub https://github.com/rheodev/CVE-2026-42945
View Code
GitHub https://github.com/cipherspy/CVE-2026-42945-POC
View Code
MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector NETWORK
Complexity HIGH
Privileges N/A
Interaction NONE
CVSS Vector String 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

Affected Stack

No specific products linked.