CVE-2026-42945

HIGHPre-NVD 8.18.6▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.6 because EPSS predicts 61% probability of exploitation within the next 30 days (top 0.9% of all CVEs). the CNA's CVSS baseline 8.1 retained for reference (NVD's own analysis pending). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: cna:f5, epss, ghsa
Elevated
8.6EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 61%
CISA-KEV: Not listedEPSS PROB: 61%CVSS: 8.1Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.1
EG Score
8.6(high)
EG Risk
63(Track)
EG Risk 63/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity86% × 45%
Exploitation61% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
61%
EPSS %ILE
99%
KEV
Not listed

Published

May 13, 2026

Last Modified

July 20, 2026

Advisory Details (1)

Auto-updated May 13, 2026
No patch confirmed yet.
generic

myF5

https://my.f5.com/manage/s/article/K000161019

Vendor Advisories for CVE-2026-42945(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(29)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.10.3-0ubuntu0.16.04.5+esm7) @ xenial2026-06-29ubuntu
ubuntunginx-light (1.28.0-6ubuntu1.3) @ questing2026-06-29ubuntu
redhatodf4/odf-multicluster-console-rhel9:17799683032026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799466912026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17798813322026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17798811222026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799524632026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799595922026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799721792026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17798813772026-06-02redhat
redhatrhui5/rhua-rhel9:17797982222026-05-27redhat
redhatsatellite/iop-gateway-rhel9:17797067972026-05-25redhat
redhatsatellite/iop-gateway-rhel9:17797067452026-05-25redhat
redhatnginx:1.24-9080020260514160836.92026-05-19redhat
redhatnginx-2:1.26.3-6.el10_2.32026-05-19redhat
redhatnginx:1.26-9080020260514152324.92026-05-19redhat
redhatnginx-2:1.20.1-28.el9_8.22026-05-19redhat
redhatnginx:1.24-8100020260514165201.489197e62026-05-18redhat
redhatnginx-2:1.20.1-24.el9_7.32026-05-18redhat
redhatnginx-2:1.26.3-2.el10_1.22026-05-18redhat
redhatnginx-1:1.20.1-10.el9_0.42026-05-15redhat
redhatnginx-2:1.20.1-22.el9_6.62026-05-15redhat
redhatnginx:1.26-9060020260514170123.92026-05-15redhat
redhatnginx-1:1.20.1-14.el9_2.62026-05-15redhat
redhatnginx-1:1.20.1-16.el9_4.62026-05-15redhat
redhatnginx:1.24-9040020260514192210.92026-05-15redhat
redhatnginx-2:1.26.3-1.el10_0.92026-05-15redhat
redhatnginx:1.24-9060020260514175739.92026-05-15redhat
redhatnginx-main-1.30.1-1.hum12026-05-14redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 30× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 156 total refreshes for this CVE.

  1. 2026-07-26 14:54 UTCEPSS rescore
  2. 2026-07-26 14:54 UTCEPSS rescore
  3. 2026-07-25 14:18 UTCEPSS rescore
  4. 2026-07-24 14:17 UTCEPSS rescore
  5. 2026-07-23 14:18 UTCEPSS rescore
  6. 2026-07-23 03:12 UTCEG score recompute▲ 0.50
  7. 2026-07-22 14:08 UTCEPSS rescore
  8. 2026-07-21 15:24 UTCEPSS rescore
  9. 2026-07-20 17:08 UTCEPSS rescore
  10. 2026-07-19 14:31 UTCEPSS rescore
  11. 2026-07-18 10:04 UTCEPSS rescore
  12. 2026-07-18 03:29 UTCOSV refresh
  13. 2026-07-16 17:03 UTCEPSS rescore
  14. 2026-07-15 16:57 UTCEPSS rescore
  15. 2026-07-13 22:30 UTCEPSS rescore
  16. 2026-07-13 06:13 UTCEPSS rescore
  17. 2026-07-11 08:27 UTCEPSS rescore
  18. 2026-07-09 19:10 UTCEPSS rescore
  19. 2026-07-08 15:16 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-05 02:30 UTCEPSS rescore
  22. 2026-07-01 15:06 UTCEPSS rescore
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-29 22:58 UTCVendor advisory
  25. 2026-06-29 22:58 UTCGHSA enrichment
Show 75 more
  1. 2026-06-28 11:31 UTCVendor advisory
  2. 2026-06-28 11:31 UTCGHSA enrichment
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 23:33 UTCVendor advisory
  5. 2026-06-27 23:33 UTCGHSA enrichment
  6. 2026-06-27 08:12 UTCVendor advisory
  7. 2026-06-27 08:12 UTCGHSA enrichment
  8. 2026-06-27 03:08 UTCEPSS rescore
  9. 2026-06-26 20:32 UTCVendor advisory
  10. 2026-06-26 20:32 UTCGHSA enrichment
  11. 2026-06-25 19:41 UTCVendor advisory
  12. 2026-06-25 19:41 UTCGHSA enrichment
  13. 2026-06-25 13:49 UTCEPSS rescore
  14. 2026-06-25 13:49 UTCEPSS rescore
  15. 2026-06-24 14:05 UTCEPSS rescore
  16. 2026-06-23 21:33 UTCEPSS rescore
  17. 2026-06-22 14:25 UTCEPSS rescore
  18. 2026-06-22 14:25 UTCEPSS rescore
  19. 2026-06-21 14:56 UTCEPSS rescore
  20. 2026-06-21 14:56 UTCEPSS rescore
  21. 2026-06-21 01:59 UTCEPSS rescore
  22. 2026-06-18 17:52 UTCEPSS rescore
  23. 2026-06-18 17:52 UTCEPSS rescore
  24. 2026-06-17 17:53 UTCEPSS rescore
  25. 2026-06-17 14:34 UTCVendor advisory
  26. 2026-06-17 14:34 UTCGHSA enrichment
  27. 2026-06-16 22:33 UTCVendor advisory
  28. 2026-06-16 22:33 UTCGHSA enrichment
  29. 2026-06-16 17:52 UTCEPSS rescore
  30. 2026-06-16 00:57 UTCVendor advisory
  31. 2026-06-16 00:56 UTCGHSA enrichment
  32. 2026-06-15 17:49 UTCEPSS rescore
  33. 2026-06-14 22:53 UTCVendor advisory
  34. 2026-06-14 22:53 UTCGHSA enrichment
  35. 2026-06-14 11:20 UTCVendor advisory
  36. 2026-06-14 11:20 UTCGHSA enrichment
  37. 2026-06-13 23:47 UTCVendor advisory
  38. 2026-06-13 23:47 UTCGHSA enrichment
  39. 2026-06-13 23:00 UTCEPSS rescore
  40. 2026-06-13 07:00 UTCVendor advisory
  41. 2026-06-13 07:00 UTCGHSA enrichment
  42. 2026-06-12 23:12 UTCEPSS rescore
  43. 2026-06-12 23:12 UTCEPSS rescore
  44. 2026-06-12 19:26 UTCVendor advisory
  45. 2026-06-12 19:26 UTCGHSA enrichment
  46. 2026-06-12 07:50 UTCVendor advisory
  47. 2026-06-12 07:49 UTCGHSA enrichment
  48. 2026-06-11 20:17 UTCVendor advisory
  49. 2026-06-11 20:17 UTCGHSA enrichment
  50. 2026-06-11 14:00 UTCEPSS rescore
  51. 2026-06-11 08:45 UTCVendor advisory
  52. 2026-06-11 08:44 UTCGHSA enrichment
  53. 2026-06-10 22:18 UTCEPSS rescore
  54. 2026-06-10 21:12 UTCVendor advisory
  55. 2026-06-10 21:12 UTCGHSA enrichment
  56. 2026-06-10 13:22 UTCEPSS rescore
  57. 2026-06-10 13:22 UTCEPSS rescore
  58. 2026-06-10 09:39 UTCVendor advisory
  59. 2026-06-10 09:39 UTCGHSA enrichment
  60. 2026-06-09 22:07 UTCVendor advisory
  61. 2026-06-09 22:07 UTCGHSA enrichment
  62. 2026-06-09 10:29 UTCVendor advisory
  63. 2026-06-09 10:29 UTCGHSA enrichment
  64. 2026-06-08 22:57 UTCVendor advisory
  65. 2026-06-08 22:57 UTCGHSA enrichment
  66. 2026-06-08 14:17 UTCEPSS rescore
  67. 2026-06-08 14:17 UTCEPSS rescore
  68. 2026-06-08 11:24 UTCVendor advisory
  69. 2026-06-08 11:24 UTCGHSA enrichment
  70. 2026-06-07 23:51 UTCVendor advisory
  71. 2026-06-07 23:51 UTCGHSA enrichment
  72. 2026-06-07 15:25 UTCEPSS rescore
  73. 2026-06-07 15:25 UTCEPSS rescore
  74. 2026-06-07 12:18 UTCVendor advisory
  75. 2026-06-07 12:18 UTCGHSA enrichment

Publicly available exploits

(10 references)

Working exploit code is in the public domain (10 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCnu0l/NGINX-Rift
    First seen May 25, 2026

    CVE-2026-42945 NGINX 堆溢出漏洞扫描与验证工具

    Open source ↗
  • GitHub PoCbamov970/CVE-2026-42945-Nginx-RCE-bypass-ASLR
    First seen May 25, 2026

    CVE-2026-42945 turns a 17-year-old NGINX rewrite bug into remote code execution — even with ASLR on, by chaining the heap overflow with live worker memory read through a common file-read flaw.

    Open source ↗
  • GitHub PoCtal7aouy/nginx-cve-2026-42945
    First seen May 17, 2026

    🛡️ Script to test for NGINX CVE-2026-42945

    Open source ↗
  • GitHub PoCMateusVerass/nGixshell
    First seen May 16, 2026

    nginx CVE scanner + RCE exploit framework (CVE-2026-42945 + 16 others)

    Open source ↗
  • GitHub PoCoseasfr/Scanner_CVE_2026-42945
    First seen May 15, 2026

    Script Python para detecção de instâncias Nginx vulneráveis ao CVE-2026-42945 em IPs, CIDRs e ASNs.

    Open source ↗
  • GitHub PoCjelasin/CVE-2026-42945
    First seen May 15, 2026
    Open source ↗
  • GitHub PoCiammerrida-source/nginx-rift-detect
    First seen May 15, 2026

    Behavioral detection script for CVE-2026-42945 (NGINX Rift) — heap overflow in ngx_http_rewrite_module. No RCE, crash-based detection only.

    Open source ↗
  • GitHub PoCcipherspy/CVE-2026-42945-POC
    First seen May 14, 2026

    exploit for CVE-2026-42945

    Open source ↗
  • GitHub PoCfriparia/NGINX_RIFT_SCAN_CVE_2026_42945
    First seen May 14, 2026

    Nginx Rewrite CVE Scan(CVE-2026-42945 nginx-rift CVE-2026-9256)

    Open source ↗
  • GitHub PoCp3Nt3st3r-sTAr/CVE-2026-42945-POC
    First seen May 14, 2026
    Open source ↗

Frequently asked(5)

What is CVE-2026-42945?
CVE-2026-42945 is a high vulnerability published on May 13, 2026. NGINX Plus and NGINX Open Source have a vulnerability in the ngxhttprewrite_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…
When was CVE-2026-42945 disclosed?
CVE-2026-42945 was first published in the National Vulnerability Database on May 13, 2026, with the most recent update on July 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42945 actively exploited?
CVE-2026-42945 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 61% probability of exploitation in the next 30 days, which ranks it in the top 0.9% of all scored CVEs.
What is the CVSS score of CVE-2026-42945?
CVE-2026-42945 has a CVSS v4.0 base score of 8.1 (CNA self-assessment; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.6.
How do I remediate CVE-2026-42945?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42945, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-42945

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