CVE-2024-49768

CRITICALNVD 9.19.1
EchelonGraph scoreMEDIUM confidence

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

Score 9.1 from GitHub Security Advisory (severity: CRITICAL) published 2024-10-29. NVD baseline CVSS 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2024-0187 (ENISA EUVD) · GHSA-9298-4cf8-g4wj (GitHub Security Advisories)Source: ENISA EUVD

9.1EG
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).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.1Exploit: None knownExposed services: Not assessed

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
9.1CRITICALmedium confidence
EG Risk
56
EG Risk 56/100

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)
Severity91% × 45%
Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
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 total (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
0.5%
EPSS %ILE
41st
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 (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.

EG Severity
9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). 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: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: 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 total (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)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (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

October 29, 2024

Last Modified

November 7, 2024

Advisory Details (2)

Auto-updated Jul 21, 2026
Patch available. Sources: github_commit, github.
GitHub advisoryMentions a patch (unverified)

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(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntupython3-waitress (1.4.1-1ubuntu0.2) @ focal2026-11-02ubuntu
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
pipwaitress @ 3.0.1 (fixes >= 2.0.0, < 3.0.1)—ghsa

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

(4 across 4 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
waitress2.1.2-2
  • every version up to 2.1.2-2+deb12u1: fixed in 2.1.2-2+deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
waitress—
  • every version up to 3.0.1-1: fixed in 3.0.1-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
waitress—
  • every version up to 3.0.1-1: fixed in 3.0.1-1
—
PyPI(1)
PackageVulnerable rangeFix by version rangeDependents
waitress2.0.0 ... 3.0.0 (6 versions)
  • 2.0.0 up to 3.0.1: fixed in 3.0.1
—

Weakness Classification(2)

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

All Vendor Advisories

(10)

Data Freshness Timeline

(refreshed 24× in last 7d / 75× 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 97 of 253 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. 3 repeat rows among the latest 100 are merged into the row they repeat. The 156 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 10:19 UTCEG score recompute
  2. 2026-11-02 10:19 UTCVendor advisory
  3. 2026-11-02 10:19 UTCGHSA enrichmentGHSA-9298-4cf8-g4wj · GitHub severity CRITICAL · GitHub CVSS 9.1
  4. 2026-11-01 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-11-01 08:24 UTCVendor advisory
  6. 2026-11-01 08:24 UTCGHSA enrichmentGHSA-9298-4cf8-g4wj · GitHub severity CRITICAL · GitHub CVSS 9.1
  7. 2026-11-01 08:11 UTCGHSA enrichmentGHSA-9298-4cf8-g4wj · GitHub severity CRITICAL · GitHub CVSS 9.1
  8. 2026-11-01 08:11 UTCEG score recompute
  9. 2026-10-31 16:30 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  10. 2026-10-31 06:34 UTCEG score recompute
  11. 2026-10-31 06:34 UTCVendor advisory
  12. 2026-10-30 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  13. 2026-10-30 04:43 UTCEG score recompute
  14. 2026-10-30 04:43 UTCVendor advisory
  15. 2026-10-29 16:31 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-10-29 02:52 UTCEG score recompute
  17. 2026-10-29 02:52 UTCVendor advisory
  18. 2026-10-28 16:29 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-28 01:01 UTCEG score recompute
  20. 2026-10-28 01:01 UTCVendor advisory
  21. 2026-10-27 16:30 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  22. 2026-10-26 23:08 UTCEG score recompute
  23. 2026-10-26 23:08 UTCVendor advisory
  24. 2026-10-26 16:29 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-25 17:54 UTCVendor advisory
Show 72 more
  1. 2026-10-25 16:59 UTCEG score recompute
  2. 2026-10-25 16:30 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-24 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-24 15:30 UTCEG score recompute
  5. 2026-10-24 15:30 UTCVendor advisory
  6. 2026-10-23 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-23 13:37 UTCEG score recompute
  8. 2026-10-23 13:37 UTCVendor advisory
  9. 2026-10-22 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-22 11:45 UTCEG score recompute
  11. 2026-10-22 11:45 UTCVendor advisory
  12. 2026-10-21 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-21 09:52 UTCEG score recompute
  14. 2026-10-21 09:52 UTCVendor advisory
  15. 2026-10-20 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-10-20 08:01 UTCEG score recompute
  17. 2026-10-20 08:01 UTCVendor advisory
  18. 2026-10-19 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  19. 2026-10-19 06:11 UTCEG score recompute
  20. 2026-10-19 06:11 UTCVendor advisory
  21. 2026-10-18 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  22. 2026-10-18 04:19 UTCEG score recompute
  23. 2026-10-18 04:19 UTCVendor advisory
  24. 2026-10-17 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  25. 2026-10-17 02:18 UTCEG score recompute
  26. 2026-10-17 02:18 UTCVendor advisory
  27. 2026-10-16 16:37 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  28. 2026-10-16 00:26 UTCEG score recompute
  29. 2026-10-16 00:26 UTCVendor advisory
  30. 2026-10-15 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  31. 2026-10-14 18:54 UTCEG score recompute
  32. 2026-10-14 18:54 UTCVendor advisory
  33. 2026-10-14 16:30 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  34. 2026-10-13 16:31 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  35. 2026-10-13 15:15 UTCVendor advisory
  36. 2026-10-12 17:42 UTCEG score recompute
  37. 2026-10-12 16:31 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  38. 2026-10-12 13:24 UTCVendor advisory
  39. 2026-10-11 21:07 UTCEG score recompute
  40. 2026-10-11 15:59 UTCEG score recompute
  41. 2026-10-11 13:46 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  42. 2026-10-10 19:58 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  43. 2026-10-10 10:33 UTCOSV refresh
  44. 2026-10-09 20:05 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  45. 2026-10-08 17:08 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  46. 2026-10-07 23:46 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  47. 2026-10-06 15:16 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  48. 2026-10-05 17:41 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  49. 2026-10-04 23:20 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  50. 2026-10-03 14:24 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  51. 2026-10-01 22:42 UTCEG score recompute
  52. 2026-10-01 19:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  53. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  54. 2026-09-29 15:18 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  55. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  56. 2026-09-27 13:44 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  57. 2026-09-26 15:57 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  58. 2026-09-24 14:01 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  59. 2026-09-23 13:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  60. 2026-09-22 14:47 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  61. 2026-09-20 20:14 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  62. 2026-09-20 20:03 UTCOSV refresh
  63. 2026-09-19 15:40 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  64. 2026-09-18 19:26 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  65. 2026-09-17 19:27 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  66. 2026-09-16 14:06 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  67. 2026-09-16 05:12 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  68. 2026-09-15 03:08 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  69. 2026-09-13 16:45 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  70. 2026-09-12 14:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  71. 2026-09-11 14:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  72. 2026-09-11 09:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile

Frequently asked(5)

What is CVE-2024-49768?
CVE-2024-49768 is a critical-severity vulnerability; its CVE record was 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 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…
When was the CVE record for CVE-2024-49768 published?
The CVE record for CVE-2024-49768 was published on October 29, 2024. 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 November 7, 2024; the record at its source may have been updated since.
Is CVE-2024-49768 actively exploited?
CVE-2024-49768 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (41st percentile of EPSS-scored CVEs).
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?
A fix for CVE-2024-49768 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2024-49768

Explore →

Is Your Infrastructure Affected by CVE-2024-49768?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.