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 (continuous uplift above 30%)
Sources: epss, ghsa, secondary
Elevated
8.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.4%CVSS: 8.1Exploit: Elevated riskExposed services: Not assessed

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
8.7HIGHhigh confidence
EG Risk
66
EG Risk 66/100

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%
EPSS PROB
3.4%
EPSS %ILE
88th
KEV
Not listed

Published

May 13, 2026

Last Modified

September 10, 2026

Advisory Details (1)

Auto-updated May 13, 2026
Patch available.
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 / EcosystemFix (by version range) / 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 rangeFix by version rangeDependents
nginx—
  • every version up to 1.26.3-r1: fixed in 1.26.3-r1
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
nginx—
  • every version up to 1.28.3-r1: fixed in 1.28.3-r1
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
nginx—
  • every version up to 1.28.3-r1: fixed in 1.28.3-r1
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
nginx—
  • every version up to 1.30.1-r0: fixed in 1.30.1-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
nginx1.18.0-6.1 ... 1.18.0-6.1+deb11u5 (6 versions)
  • every version up to 1.18.0-6.1+deb11u6: fixed in 1.18.0-6.1+deb11u6
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
nginx1.22.1-9 ... 1.22.1-9+deb12u6 (7 versions)
  • every version up to 1.22.1-9+deb12u7: fixed in 1.22.1-9+deb12u7
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
nginx1.26.3-3, 1.26.3-3+deb13u1, 1.26.3-3+deb13u2, 1.26.3-3+deb13u3, 1.26.3-3+deb13u4
  • every version up to 1.26.3-3+deb13u5: fixed in 1.26.3-3+deb13u5
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
nginx1.26.3-3 ... 1.30.0-2 (18 versions)
  • every version up to 1.30.0-3: fixed in 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 / 19× 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 301 total refreshes for this CVE.

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

Publicly available exploits

(14 references, 10 shown)

Public exploit code is referenced for this CVE (14 GitHub PoCs). Defenders should treat patch urgency accordingly.

  • GitHub PoCbamov970/CVE-2026-42945-Nginx-RCE-bypass-ASLR
    Published 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 PoCnu0l/NGINX-Rift
    Published May 25, 2026

    CVE-2026-42945 NGINX 堆溢出漏洞扫描与验证工具

    Open source ↗
  • GitHub PoCgagaltotal/CVE-2026-42945-NGINX-Rift-Toolkit
    Published May 20, 2026

    CVE-2026-42945 - NGINX Rift Toolkit

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

    🛡️ Script to test for NGINX CVE-2026-42945

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

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

    Open source ↗
  • GitHub PoCiammerrida-source/nginx-rift-detect
    Published 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 PoCjelasin/CVE-2026-42945
    Published May 15, 2026
    Open source ↗
  • GitHub PoCoseasfr/Scanner_CVE_2026-42945
    Published May 15, 2026

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

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

    exploit for CVE-2026-42945

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

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

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

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 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 3.4% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-42945?
CVE-2026-42945 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.7 (HIGH).
How do I remediate CVE-2026-42945?
A fix for CVE-2026-42945 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-42945 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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