CVE-2026-42945 (GCVE-0-2026-42945)
Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-09-10 12:04Title
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)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 00:00 UTC
Assigner
References
34 references
Impacted products
48 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| F5 | NGINX Plus |
Unaffected:
R37 , < *
(custom)
Affected: R36 , < R36 P4 (custom) Affected: R32 , < R32 P6 (custom) |
guessed | |
| F5 | NGINX Open Source |
Unaffected:
1.31.0 , < *
(semver)
Affected: 0.6.27 , < 1.30.1 (semver) |
guessed | |
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
2:1.26.3-2.el10_1.2 , < *
(rpm)
Unaffected: 2:1.26.3-6.el10_2.3 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.1 cpe:/o:redhat:enterprise_linux:10.2 |
||
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
2:1.26.3-1.el10_0.9 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
||
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260514165201.489197e6 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8 |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
2:1.20.1-24.el9_7.3 , < *
(rpm)
Unaffected: 2:1.20.1-28.el9_8.2 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260514160836.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
||
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
9080020260514152324.9 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 |
||
| Red Hat | Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions |
Unaffected:
1:1.20.1-10.el9_0.4 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.0 |
||
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
1:1.20.1-14.el9_2.6 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
||
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
1:1.20.1-16.el9_4.6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
||
| Red Hat | Red Hat Enterprise Linux 9.4 Extended Update Support |
Unaffected:
9040020260514192210.9 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.4 |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
9060020260514175739.9 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
9060020260514170123.9 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
||
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
2:1.20.1-22.el9_6.6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
||
| Red Hat | Red Hat Hardened Images |
Unaffected:
1.30.1-1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.14 |
Unaffected:
1779972138 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.14::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.14 |
Unaffected:
1779972283 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.14::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.14 |
Unaffected:
1779972179 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.14::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.15 |
Unaffected:
1779967811 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.15::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.15 |
Unaffected:
1779967813 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.15::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.15 |
Unaffected:
1779968303 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.15::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.16 |
Unaffected:
1779959318 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.16::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.16 |
Unaffected:
1779959527 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.16::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.16 |
Unaffected:
1779959592 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.16::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.17 |
Unaffected:
1779952245 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.17::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.17 |
Unaffected:
1779952279 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.17::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.17 |
Unaffected:
1779952463 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.17::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.18 |
Unaffected:
1779881302 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.18::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.18 |
Unaffected:
1779881608 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.18::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.18 |
Unaffected:
1779881122 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.18::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.19 |
Unaffected:
1779881012 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.19::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.19 |
Unaffected:
1779881008 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.19::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.19 |
Unaffected:
1779881332 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.19::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.20 |
Unaffected:
1779879463 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.20::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.20 |
Unaffected:
1779877770 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.20::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.20 |
Unaffected:
1779881377 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.20::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.21 |
Unaffected:
1779946521 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.21::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.21 |
Unaffected:
1779946525 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.21::el9 |
||
| Red Hat | Red Hat Openshift Data Foundation 4.21 |
Unaffected:
1779946691 , < *
(rpm)
cpe:/a:redhat:openshift_data_foundation:4.21::el9 |
||
| Red Hat | Red Hat Satellite 6.18 |
Unaffected:
1779706745 , < *
(rpm)
cpe:/a:redhat:satellite:6.18::el9 |
||
| Red Hat | Red Hat Satellite 6.19 |
Unaffected:
1779706797 , < *
(rpm)
cpe:/a:redhat:satellite:6.19::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1779798159 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1779798222 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241211 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat Update Infrastructure 5 |
Unaffected:
1787241260 , < *
(rpm)
cpe:/a:redhat:rhui:5::el9 |
||
| Red Hat | Red Hat 3scale API Management Platform 2 |
cpe:/a:redhat:red_hat_3scale_amp:2
|
||
| Red Hat | Red Hat Lightspeed proxy 1 |
cpe:/a:redhat:insights_proxy:1
|
Date Public
2026-05-13 14:00
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 4e443b69-4039-45a7-b99d-a89cc8ee80e9
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
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Vulnerability timeline
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.