CVE-2026-42945 (GCVE-0-2026-42945)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-06-29 12:34
VLAI KEVIntel
Title
NGINX ngx_http_rewrite_module vulnerability
Summary
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.
Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
9.2 (Critical)
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-122 - Heap-based Buffer Overflow.
  • CWE-131 - Incorrect Calculation of Buffer Size
Assigner
f5
References
URL Tags
https://my.f5.com/manage/s/article/K000161019 vendor-advisorypatch
https://depthfirst.com/nginx-rift
https://github.com/DepthFirstDisclosures/Nginx-Rift
https://access.redhat.com/security/cve/CVE-2026-42945 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2477116 issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v… x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:17790 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18063 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19159 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18041 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17791 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17751 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17792 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17793 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17752 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17794 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17753 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:18029 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19371 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19374 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19372 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:17417 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22396 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22393 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22394 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22390 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22388 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22389 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22382 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:22383 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20442 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20444 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:21275 vendor-advisoryx_refsource_REDHAT
Impacted products
Vendor Product Version
F5 NGINX Plus Unaffected: R37 , < * (custom)
Affected: R36 , < R36 P4 (custom)
Affected: R32 , < R32 P6 (custom)
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F5 NGINX Open Source Unaffected: 1.31.0 , < * (semver)
Affected: 0.6.27 , < 1.30.1 (semver)
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream (v. 8)     cpe:/a:redhat:enterprise_linux:8::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.0)     cpe:/a:redhat:rhel_e4s:9.0::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.1
    cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.4)     cpe:/a:redhat:rhel_eus:9.4::crb
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Openshift Data Foundation 4.14     cpe:/a:redhat:openshift_data_foundation:4.14::el9
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Red Hat Red Hat Openshift Data Foundation 4.15     cpe:/a:redhat:openshift_data_foundation:4.15::el9
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Red Hat Red Hat Openshift Data Foundation 4.16     cpe:/a:redhat:openshift_data_foundation:4.16::el9
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Red Hat Red Hat Openshift Data Foundation 4.17     cpe:/a:redhat:openshift_data_foundation:4.17::el9
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Red Hat Red Hat Openshift Data Foundation 4.18     cpe:/a:redhat:openshift_data_foundation:4.18::el9
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Red Hat Red Hat Openshift Data Foundation 4.19     cpe:/a:redhat:openshift_data_foundation:4.19::el9
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Red Hat Red Hat Openshift Data Foundation 4.21     cpe:/a:redhat:openshift_data_foundation:4.21::el9
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Red Hat Red Hat Openshift Data Foundation 4.2     cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Satellite 6.18     cpe:/a:redhat:satellite:6.18::el9
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Red Hat Red Hat Satellite 6.19     cpe:/a:redhat:satellite:6.19::el9
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Red Hat Red Hat Update Infrastructure 5     cpe:/a:redhat:rhui:5::el9
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Red Hat Red Hat 3scale API Management Platform 2     cpe:/a:redhat:red_hat_3scale_amp:2
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Red Hat Red Hat Lightspeed proxy 1     cpe:/a:redhat:insights_proxy:1
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Date Public
2026-05-13 14:00
Credits
F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure.
KEVIntel
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e443b69-4039-45a7-b99d-a89cc8ee80e9

Vulnerability ID: CVE-2026-42945

Status: Confirmed

Status Updated: 2026-05-19 15:36 UTC

Exploited: Yes

Timestamps
First Seen: 2026-05-19
Asserted: 2026-05-19
Scope
Notes: KEVIntel entry: NGINX ngx_http_rewrite_module vulnerability | Affected: F5 / NGINX Plus, NGINX Open Source | CVSS: 9.2 (CRITICAL) | EPSS: 0.14453 | Used in malware: unknown | Not yet in CISA KEV: True
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title NGINX ngx_http_rewrite_module vulnerability
Vendor F5
Product NGINX Plus, NGINX Open Source
Added Date 2026-05-19T15:36:39.000Z
Cvss Score 9.2
Epss Score 0.14453
Cvss Severity CRITICAL
Epss Percentile 0.96178
Used In Malware unknown
Ahead Of Cisa Kev None
Not Yet In Cisa Kev True
References
Created: 2026-06-19 12:42 UTC | Updated: 2026-06-19 12:42 UTC
Show details on NVD website
To clipboard 

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}


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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.