CVE-2026-42544

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 75% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction path, before the ASGI application is invoked. This vulnerability is fixed in 2.7.4.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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
Severity75% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
25%
KEV
Not listed

Published

May 12, 2026

Last Modified

May 18, 2026

Advisory Details (1)

Auto-updated May 12, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Unauthenticated DoS via WebSocket subprotocol header panic · Advisory · emmett-framework/granian · GitHub

https://github.com/emmett-framework/granian/security/advisories/GHSA-vrg7-482j-p6f6

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
granian1.2.3 ... 2.7.3 (58 versions)2.7.4—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 43× 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 130 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-23 18:06 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
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  11. 2026-08-17 10:46 UTCEG score recompute
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  1. 2026-08-09 02:00 UTCEG score recompute
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  25. 2026-07-23 03:11 UTCEG score recompute
  26. 2026-07-22 14:08 UTCEPSS rescore
  27. 2026-07-21 15:24 UTCEPSS rescore
  28. 2026-07-20 17:08 UTCEPSS rescore
  29. 2026-07-19 14:31 UTCEPSS rescore
  30. 2026-07-18 10:04 UTCEPSS rescore
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  32. 2026-07-16 12:49 UTCOSV refresh
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  73. 2026-06-10 22:18 UTCEPSS rescore
  74. 2026-06-10 13:22 UTCEPSS rescore
  75. 2026-06-10 13:22 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-42544?
CVE-2026-42544 is a high vulnerability published on May 12, 2026. Granian is a Rust HTTP server for Python applications. From 1.2.0 to 2.7.4, Granian aborts a worker process when an unauthenticated client sends a WebSocket upgrade request whose Sec-WebSocket-Protocol header contains non-ASCII bytes. The crash happens in Granian's WebSocket scope construction…
When was CVE-2026-42544 disclosed?
CVE-2026-42544 was first published in the National Vulnerability Database on May 12, 2026, with the most recent update on May 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42544 actively exploited?
CVE-2026-42544 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 75.2% of all scored CVEs.
What is the CVSS score of CVE-2026-42544?
CVE-2026-42544 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-42544?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42544, 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.

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