CVE-2026-42945

HIGHPre-NVD 8.18.7▲
EchelonGraph scoreHIGH confidence

Score elevated to 8.7 because EPSS predicts 68% probability of exploitation within the next 30 days (top 0.7% of all CVEs). a secondary CVSS source baseline 8.1 retained for reference (NVD's own analysis pending). Confidence: see factors.

Triggered by: EPSS exploit prediction ≥85%
Sources: epss, ghsa, secondary
Elevated
8.7EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • High exploitation likelihood — EPSS 68%
CISA-KEV: Not listedEPSS PROB: 68%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
8.7(high)
EG Risk
66(Track)
EG Risk 66/100SSVC: 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
Severity87% × 45%
Exploitation68% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
68%
EPSS %ILE
99%
KEV
Not listed

Published

May 13, 2026

Last Modified

September 10, 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(30)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntunginx-light (1.28.3-2ubuntu1.1) @ resolute2026-09-10ubuntu
ubuntunginx-light (1.10.3-0ubuntu0.16.04.5+esm7) @ xenial2026-09-10ubuntu
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatodf4/odf-multicluster-console-rhel9:17799466912026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799595922026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17798813772026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17798811222026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799721792026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799524632026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17799683032026-06-02redhat
redhatodf4/odf-multicluster-console-rhel9:17798813322026-06-02redhat
redhatrhui5/rhua-rhel9:17797982222026-05-27redhat
redhatsatellite/iop-gateway-rhel9:17797067452026-05-25redhat
redhatsatellite/iop-gateway-rhel9:17797067972026-05-25redhat
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:1.24-9080020260514160836.92026-05-19redhat
redhatnginx-2:1.26.3-2.el10_1.22026-05-18redhat
redhatnginx-2:1.20.1-24.el9_7.32026-05-18redhat
redhatnginx:1.24-8100020260514165201.489197e62026-05-18redhat
redhatnginx:1.24-9040020260514192210.92026-05-15redhat
redhatnginx-1:1.20.1-10.el9_0.42026-05-15redhat
redhatnginx-1:1.20.1-16.el9_4.62026-05-15redhat
redhatnginx-1:1.20.1-14.el9_2.62026-05-15redhat
redhatnginx:1.26-9060020260514170123.92026-05-15redhat
redhatnginx-2:1.20.1-22.el9_6.62026-05-15redhat
redhatnginx:1.24-9060020260514175739.92026-05-15redhat
redhatnginx-2:1.26.3-1.el10_0.92026-05-15redhat
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.

Affected Packages

(8 across 8 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
nginx—1.26.3-r1—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r1—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
nginx—1.28.3-r1—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
nginx—1.30.1-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nginx1.18.0-6.1 ... 1.18.0-6.1+deb11u5 (6 versions)1.18.0-6.1+deb11u6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nginx1.22.1-9 ... 1.22.1-9+deb12u6 (7 versions)1.22.1-9+deb12u7—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3, 1.26.3-3+deb13u1, 1.26.3-3+deb13u2, 1.26.3-3+deb13u3, 1.26.3-3+deb13u41.26.3-3+deb13u5—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nginx1.26.3-3 ... 1.30.0-2 (18 versions)1.30.0-3—

Weakness Classification(2)

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

Additional Vendor Advisories

(9)

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 6× in last 7d / 52× 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 289 total refreshes for this CVE.

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

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 PoCgagaltotal/CVE-2026-42945-NGINX-Rift-Toolkit
    First seen May 20, 2026

    CVE-2026-42945 - NGINX Rift Toolkit

    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 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 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 PoCp3Nt3st3r-sTAr/CVE-2026-42945-POC
    First seen May 14, 2026
    Open source ↗
  • GitHub PoCnanwinata/nginxrift-CVE-2026-42945
    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 September 10, 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 68% probability of exploitation in the next 30 days, which ranks it in the top 0.7% of all scored CVEs.
What is the CVSS score of CVE-2026-42945?
CVE-2026-42945 has a CVSS v3 base score of 8.1 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.7.
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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-42945

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