CVE-2024-49768

CRITICALNVD 9.19.1—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 60% 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
9.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.1Exploit: NoneExposed: 0

A fix is available — apply it.

Waitress is a Web Server Gateway Interface server for Python 2 and 3. A remote client may send a request that is exactly recv_bytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining. When request lookahead is disabled (default) we won't read any more requests, and when the first request fails due to a parsing error, we simply close the connection. However when request lookahead is enabled, it is possible to process and receive the first request, start sending the error message back to the client while we read the next request and queue it. This will allow the secondary request to be serviced by the worker thread while the connection should be closed. Waitress 3.0.1 fixes the race condition. As a workaround, disable channel_request_lookahead, this is set to 0 by default disabling this feature.

CVSS v3
9.1
EG Score
9.1(medium)
EG Risk
56(Track)
EG Risk 56/100SSVC: 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
Severity91% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
39.6%
KEV
Not listed

Published

October 29, 2024

Last Modified

November 7, 2024

Advisory Details (2)

Auto-updated Jul 21, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Request processing race condition in HTTP pipelining with invalid first request · Advisory · Pylons/waitress · GitHub

https://github.com/Pylons/waitress/security/advisories/GHSA-9298-4cf8-g4wj
github_commit Patch Available

commit e4359018537a (Pylons/waitress)

Patch available: Pylons/waitress v3.0.1 (contains commit e4359018537a)

https://github.com/Pylons/waitress/commit/e4359018537af376cf24bd13616d861e2fb76f65

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-waitress (3.0.0-1ubuntu0.1) @ oracular2026-05-23ubuntu
redhatpython-waitress-0:2.0.0-4.el9ost2025-02-10redhat
redhatpython-waitress-0:2.0.0-4.el8ost2025-02-10redhat
redhatpython-waitress-0:3.0.1-1.el92024-12-12redhat

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)
PyPI(1)
PackageVulnerable rangeFixed inDependents
waitress2.0.0 ... 3.0.0 (6 versions)3.0.1—

Weakness Classification(2)

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

All Vendor Advisories

(10)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 12× in last 7d / 44× 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.

  1. 2026-07-23 02:42 UTCEG score recompute
  2. 2026-07-22 14:07 UTCEPSS rescore
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  18. 2026-07-13 22:07 UTCOSV refresh
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  1. 2026-07-07 13:45 UTCEPSS rescore
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  14. 2026-06-25 19:16 UTCOSV refresh
  15. 2026-06-25 13:49 UTCEPSS rescore
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  23. 2026-06-21 01:59 UTCEPSS rescore
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  25. 2026-06-19 19:25 UTCEPSS rescore
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  42. 2026-06-08 14:16 UTCEPSS rescore
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  44. 2026-06-08 08:58 UTCOSV refresh
  45. 2026-06-07 15:24 UTCEPSS rescore
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  47. 2026-06-06 13:46 UTCEPSS rescore
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  73. 2026-05-23 19:24 UTCEG score recompute
  74. 2026-05-23 19:24 UTCVendor advisory

Frequently asked(5)

What is CVE-2024-49768?
CVE-2024-49768 is a critical vulnerability published on October 29, 2024. Waitress is a Web Server Gateway Interface server for Python 2 and 3. A remote client may send a request that is exactly recvbytes (defaults to 8192) long, followed by a secondary request using HTTP pipelining. When request lookahead is disabled (default) we won't read any more requests, and when…
When was CVE-2024-49768 disclosed?
CVE-2024-49768 was first published in the National Vulnerability Database on October 29, 2024, with the most recent update on November 7, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-49768 actively exploited?
CVE-2024-49768 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2024-49768?
CVE-2024-49768 has a CVSS v3 base score of 9.1 (NVD).
How do I remediate CVE-2024-49768?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-49768, 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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