CVE-2026-44578

HIGHPre-NVD 8.68.6
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.6 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 36% (98th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated

Also known asEUVD-2026-30080 (ENISA EUVD)Source: ENISA EUVD

8.6EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 36%CVSS: 8.6Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server to proxy requests to arbitrary internal or external destinations, which may expose internal services or cloud metadata endpoints. Vercel-hosted deployments are not affected. This vulnerability is fixed in 15.5.16 and 16.2.5.

CVSS v3
8.6
EG Score
8.6HIGHmedium confidence
EG Risk
70
EG Risk 70/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity86% × 45%
Impact severity (EG Severity): CVSS 8.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
36%
EPSS %ILE
98th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.6): severity, escalated by confirmed exploitation. This CVE's 8.6 is its impact severity (EG Severity), not escalated.

EG Severity
8.6 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
36% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-28). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 13, 2026

Last Modified

October 26, 2026

Advisory Details (1)

Auto-updated May 13, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Server-side request forgery in applications using WebSocket upgrades · Advisory · vercel/next.js · GitHub

https://github.com/vercel/next.js/security/advisories/GHSA-c4j6-fc7j-m34r

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatnext2026-08-12redhat
redhatrhtas/rekor-search-ui-rhel9:17839586222026-07-16redhat
redhatrhtas/rekor-search-ui-rhel9:17833271852026-07-09redhat

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

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
next—
  • 13.4.13 up to 15.5.16: fixed in 15.5.16
  • 16.0.0 up to 16.2.5: fixed in 16.2.5
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 42× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 203 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 36% · 98th percentile
  2. 2026-10-29 16:25 UTCEG score recompute
  3. 2026-10-29 16:25 UTCVendor advisory
  4. 2026-10-28 16:32 UTCEPSS rescoreEPSS 36% · 98th percentile
  5. 2026-10-27 16:32 UTCEPSS rescoreEPSS 36% · 98th percentile
  6. 2026-10-26 14:32 UTCEG score recompute
  7. 2026-10-26 14:32 UTCVendor advisory
  8. 2026-10-25 16:33 UTCEPSS rescoreEPSS 36% · 98th percentile
  9. 2026-10-25 14:27 UTCEG score recompute
  10. 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  11. 2026-10-23 16:31 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  12. 2026-10-22 16:34 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  13. 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  14. 2026-10-21 16:25 UTCEG score recompute
  15. 2026-10-21 16:25 UTCVendor advisory
  16. 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  17. 2026-10-19 16:32 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  18. 2026-10-18 16:32 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  19. 2026-10-18 03:39 UTCEG score recompute
  20. 2026-10-17 16:34 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  21. 2026-10-17 13:55 UTCEG score recompute
  22. 2026-10-17 13:55 UTCVendor advisory
  23. 2026-10-16 16:42 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  24. 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.9% · 79th percentile
Show 75 more
  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  3. 2026-10-12 16:05 UTCEG score recompute
  4. 2026-10-11 19:47 UTCEG score recompute
  5. 2026-10-11 17:01 UTCEG score recompute
  6. 2026-10-11 14:27 UTCEG score recompute▼ 0.10
  7. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.9% · 79th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  13. 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  14. 2026-10-04 23:22 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  15. 2026-10-03 14:25 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  17. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  18. 2026-09-30 04:58 UTCOSV refresh
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  20. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.9% · 78th percentile
  21. 2026-09-23 17:53 UTCEPSS rescoreEPSS 39% · 98th percentile
  22. 2026-09-18 19:28 UTCEPSS rescoreEPSS 39% · 98th percentile
  23. 2026-09-17 19:31 UTCEPSS rescoreEPSS 39% · 98th percentile
  24. 2026-09-16 14:08 UTCEPSS rescoreEPSS 39% · 98th percentile
  25. 2026-09-16 05:15 UTCEPSS rescoreEPSS 39% · 98th percentile
  26. 2026-09-12 15:01 UTCEPSS rescoreEPSS 39% · 98th percentile
  27. 2026-09-11 14:53 UTCEPSS rescoreEPSS 39% · 98th percentile
  28. 2026-09-11 09:37 UTCEPSS rescoreEPSS 39% · 98th percentile
  29. 2026-09-11 08:23 UTCOSV refresh
  30. 2026-09-10 09:34 UTCEPSS rescoreEPSS 39% · 98th percentile
  31. 2026-09-08 22:00 UTCEPSS rescoreEPSS 39% · 98th percentile
  32. 2026-09-06 13:47 UTCEPSS rescoreEPSS 39% · 98th percentile
  33. 2026-09-04 05:06 UTCEPSS rescoreEPSS 39% · 98th percentile
  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 39% · 98th percentile
  35. 2026-09-01 13:54 UTCEPSS rescoreEPSS 39% · 98th percentile
  36. 2026-08-30 19:17 UTCEPSS rescoreEPSS 39% · 98th percentile
  37. 2026-08-30 01:22 UTCEPSS rescoreEPSS 39% · 98th percentile
  38. 2026-08-28 21:41 UTCEPSS rescoreEPSS 39% · 98th percentile
  39. 2026-08-26 14:46 UTCEPSS rescoreEPSS 39% · 98th percentile
  40. 2026-08-25 13:49 UTCEPSS rescoreEPSS 39% · 98th percentile
  41. 2026-08-23 17:51 UTCEG score recompute
  42. 2026-08-23 17:51 UTCVendor advisory
  43. 2026-08-23 00:19 UTCEPSS rescoreEPSS 39% · 98th percentile
  44. 2026-08-21 23:49 UTCEPSS rescoreEPSS 39% · 98th percentile
  45. 2026-08-20 22:55 UTCEPSS rescoreEPSS 39% · 98th percentile
  46. 2026-08-20 19:48 UTCEG score recompute
  47. 2026-08-20 19:48 UTCVendor advisory
  48. 2026-08-19 17:04 UTCEPSS rescoreEPSS 39% · 98th percentile
  49. 2026-08-17 13:47 UTCEPSS rescoreEPSS 39% · 98th percentile
  50. 2026-08-17 10:39 UTCEG score recompute
  51. 2026-08-17 10:39 UTCVendor advisory
  52. 2026-08-16 14:56 UTCEPSS rescoreEPSS 39% · 98th percentile
  53. 2026-08-16 04:03 UTCEG score recompute
  54. 2026-08-16 04:03 UTCVendor advisory
  55. 2026-08-16 02:14 UTCEPSS rescoreEPSS 39% · 98th percentile
  56. 2026-08-15 01:30 UTCEPSS rescoreEPSS 39% · 98th percentile
  57. 2026-08-15 00:29 UTCVendor advisory
  58. 2026-08-14 13:32 UTCVendor advisory
  59. 2026-08-14 02:32 UTCEG score recompute
  60. 2026-08-14 02:32 UTCVendor advisory
  61. 2026-08-13 22:00 UTCEPSS rescoreEPSS 39% · 98th percentile
  62. 2026-08-13 13:38 UTCEG score recompute
  63. 2026-08-13 13:38 UTCVendor advisory
  64. 2026-08-13 12:28 UTCEG score recompute
  65. 2026-08-13 12:28 UTCVendor advisory
  66. 2026-08-13 02:47 UTCVendor advisory
  67. 2026-08-12 15:50 UTCEG score recompute
  68. 2026-08-12 15:50 UTCVendor advisory
  69. 2026-08-12 13:51 UTCEPSS rescoreEPSS 39% · 98th percentile
  70. 2026-08-11 15:28 UTCEG score recompute
  71. 2026-08-11 15:28 UTCVendor advisory
  72. 2026-08-11 00:57 UTCVendor advisory
  73. 2026-08-10 11:30 UTCVendor advisory
  74. 2026-08-09 23:51 UTCVendor advisory
  75. 2026-08-09 12:54 UTCVendor advisory

Publicly available exploits

(6 references)

Public exploit code is referenced for this CVE (5 GitHub PoCs), as is 1 Nuclei detection template. A detection template checks whether a system is affected; it is not necessarily exploit code. Defenders should treat patch urgency accordingly.

  • GitHub PoC0xBlackash/CVE-2026-44578
    Published May 16, 2026

    CVE-2026-44578

    Open source ↗
  • GitHub PoC0xredash/CVE-2026-44578
    Published May 16, 2026

    CVE-2026-44578

    Open source ↗
  • GitHub PoCdinosn/CVE-2026-44578
    Published May 16, 2026

    CVE-2026-44578: Next.js WebSocket Upgrade SSRF — pre-auth credential theft via localhost:80. Lab + exploit + audit.

    Open source ↗
  • GitHub PoClove07oj/nextjs-cve-2026-44578
    Published May 15, 2026

    Nuclei templates for detecting CVE-2026-44578 (Next.js WebSocket Upgrade SSRF) with multi-cloud metadata validation, Next.js fingerprinting, and real-world scanning workflows. Includes references to the original NextSSRF research and exploit tooling.

    Open source ↗
  • GitHub PoCynsmroztas/nextssrf
    Published May 15, 2026

    NextSSRF — CVE-2026-44578 Scanner & Exploit ║ ║ Next.js WebSocket Upgrade Handler SSRF

    Open source ↗
  • Nucleijavascript/cves/2026/CVE-2026-44578.yaml
    Published May 15, 2026

    Next.js WebSocket Upgrade Handler - SSRF

    Open source ↗

Frequently asked(5)

What is CVE-2026-44578?
CVE-2026-44578 is a high-severity vulnerability; its CVE record was published on May 13, 2026. Next.js is a React framework for building full-stack web applications. From 13.4.13 to before 15.5.16 and 16.2.5, self-hosted applications using the built-in Node.js server can be vulnerable to server-side request forgery through crafted WebSocket upgrade requests. An attacker can cause the server…
When was the CVE record for CVE-2026-44578 published?
The CVE record for CVE-2026-44578 was published on May 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-44578 actively exploited?
CVE-2026-44578 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36% probability of exploitation in the next 30 days (98th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-44578?
CVE-2026-44578 has a CVSS base score of 8.6 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-44578?
A fix for CVE-2026-44578 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-44578 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-44578

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