CVE-2024-2398Network attack vector

Process memory exhaustion via unfreed HTTP/2 push headers

Published Mar 27, 2024 · Updated Feb 13, 2025

Memory leakage in libcurl 7.44.0 through 8.6.0 allows remote attackers to consume process memory via HTTP/2 server push. The lib/http2.c on_header path frees only the push_headers pointer after allocation exceeds 1,000 entries, leaving each allocated header string unreleased. HTTP/2 server push must be enabled, and repeated oversized PUSH_PROMISE responses can silently leak multiple megabytes per response until the client process is interrupted.

CVSS severity8.6
High
EPSS probability36.08%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in libcurl 7.44.0 through 8.6.0 allows remote attackers to consume process memory via HTTP/2 server push. The lib/http2.c on_header path frees only the push_headers pointer after allocation exceeds 1,000 entries, leaving each allocated header string unreleased. HTTP/2 server push must be enabled, and repeated oversized PUSH_PROMISE responses can silently leak multiple megabytes per response until the client process is interrupted.

The record

CVE
CVE-2024-2398
Published
Mar 27, 2024
Updated
Feb 13, 2025
Vendor
curl
Product
curl
Classifications
CWE-772, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=7.44.0 <=7.44.0
  2. Affected versionversion=7.44.0 <=8.6.0
  3. Affected versionversion=7.45.0 <=7.45.0
  4. Affected versionversion=7.46.0 <=7.46.0
  5. Affected versionversion=7.47.0 <=7.47.0
  6. Affected versionversion=7.47.1 <=7.47.1
  7. Affected versionversion=7.48.0 <=7.48.0
  8. Affected versionversion=7.49.0 <=7.49.0
  9. Affected versionversion=7.49.1 <=7.49.1
  10. Affected versionversion=7.50.0 <=7.50.0
  11. Affected versionversion=7.50.1 <=7.50.1
  12. Affected versionversion=7.50.2 <=7.50.2
  13. Affected versionversion=7.50.3 <=7.50.3
  14. Affected versionversion=7.51.0 <=7.51.0
  15. Affected versionversion=7.52.0 <=7.52.0
  16. Affected versionversion=7.52.1 <=7.52.1
  17. Affected versionversion=7.53.0 <=7.53.0
  18. Affected versionversion=7.53.1 <=7.53.1
  19. Affected versionversion=7.54.0 <=7.54.0
  20. Affected versionversion=7.54.1 <=7.54.1
  21. Affected versionversion=7.55.0 <=7.55.0
  22. Affected versionversion=7.55.1 <=7.55.1
  23. Affected versionversion=7.56.0 <=7.56.0
  24. Affected versionversion=7.56.1 <=7.56.1
  25. Affected versionversion=7.57.0 <=7.57.0
  26. Affected versionversion=7.58.0 <=7.58.0
  27. Affected versionversion=7.59.0 <=7.59.0
  28. Affected versionversion=7.60.0 <=7.60.0
  29. Affected versionversion=7.61.0 <=7.61.0
  30. Affected versionversion=7.61.1 <=7.61.1
  31. Affected versionversion=7.62.0 <=7.62.0
  32. Affected versionversion=7.63.0 <=7.63.0
  33. Affected versionversion=7.64.0 <=7.64.0
  34. Affected versionversion=7.64.1 <=7.64.1
  35. Affected versionversion=7.65.0 <=7.65.0
  36. Affected versionversion=7.65.1 <=7.65.1
  37. Affected versionversion=7.65.2 <=7.65.2
  38. Affected versionversion=7.65.3 <=7.65.3
  39. Affected versionversion=7.66.0 <=7.66.0
  40. Affected versionversion=7.67.0 <=7.67.0
  41. Affected versionversion=7.68.0 <=7.68.0
  42. Affected versionversion=7.69.0 <=7.69.0
  43. Affected versionversion=7.69.1 <=7.69.1
  44. Affected versionversion=7.70.0 <=7.70.0
  45. Affected versionversion=7.71.0 <=7.71.0
  46. Affected versionversion=7.71.1 <=7.71.1
  47. Affected versionversion=7.72.0 <=7.72.0
  48. Affected versionversion=7.73.0 <=7.73.0
  49. Affected versionversion=7.74.0 <=7.74.0
  50. Affected versionversion=7.75.0 <=7.75.0
  51. Affected versionversion=7.76.0 <=7.76.0
  52. Affected versionversion=7.76.1 <=7.76.1
  53. Affected versionversion=7.77.0 <=7.77.0
  54. Affected versionversion=7.78.0 <=7.78.0
  55. Affected versionversion=7.79.0 <=7.79.0
  56. Affected versionversion=7.79.1 <=7.79.1
  57. Affected versionversion=7.80.0 <=7.80.0
  58. Affected versionversion=7.81.0 <=7.81.0
  59. Affected versionversion=7.82.0 <=7.82.0
  60. Affected versionversion=7.83.0 <=7.83.0
  61. Affected versionversion=7.83.1 <=7.83.1
  62. Affected versionversion=7.84.0 <=7.84.0
  63. Affected versionversion=7.85.0 <=7.85.0
  64. Affected versionversion=7.86.0 <=7.86.0
  65. Affected versionversion=7.87.0 <=7.87.0
  66. Affected versionversion=7.88.0 <=7.88.0
  67. Affected versionversion=7.88.1 <=7.88.1
  68. Affected versionversion=8.0.0 <=8.0.0
  69. Affected versionversion=8.0.1 <=8.0.1
  70. Affected versionversion=8.1.0 <=8.1.0
  71. Affected versionversion=8.1.1 <=8.1.1
  72. Affected versionversion=8.1.2 <=8.1.2
  73. Affected versionversion=8.2.0 <=8.2.0
  74. Affected versionversion=8.2.1 <=8.2.1
  75. Affected versionversion=8.3.0 <=8.3.0
  76. Affected versionversion=8.4.0 <=8.4.0
  77. Affected versionversion=8.5.0 <=8.5.0
  78. Affected versionversion=8.6.0 <=8.6.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

curl · curlversion=7.44.0 <=7.44.0; version=7.44.0 <=8.6.0; version=7.45.0 <=7.45.0; version=7.46.0 <=7.46.0; version=7.47.0 <=7.47.0; version=7.47.1 <=7.47.1; version=7.48.0 <=7.48.0; version=7.49.0 <=7.49.0; version=7.49.1 <=7.49.1; version=7.50.0 <=7.50.0; version=7.50.1 <=7.50.1; version=7.50.2 <=7.50.2; version=7.50.3 <=7.50.3; version=7.51.0 <=7.51.0; version=7.52.0 <=7.52.0; version=7.52.1 <=7.52.1; version=7.53.0 <=7.53.0; version=7.53.1 <=7.53.1; version=7.54.0 <=7.54.0; version=7.54.1 <=7.54.1; version=7.55.0 <=7.55.0; version=7.55.1 <=7.55.1; version=7.56.0 <=7.56.0; version=7.56.1 <=7.56.1; version=7.57.0 <=7.57.0; version=7.58.0 <=7.58.0; version=7.59.0 <=7.59.0; version=7.60.0 <=7.60.0; version=7.61.0 <=7.61.0; version=7.61.1 <=7.61.1; version=7.62.0 <=7.62.0; version=7.63.0 <=7.63.0; version=7.64.0 <=7.64.0; version=7.64.1 <=7.64.1; version=7.65.0 <=7.65.0; version=7.65.1 <=7.65.1; version=7.65.2 <=7.65.2; version=7.65.3 <=7.65.3; version=7.66.0 <=7.66.0; version=7.67.0 <=7.67.0; version=7.68.0 <=7.68.0; version=7.69.0 <=7.69.0; version=7.69.1 <=7.69.1; version=7.70.0 <=7.70.0; version=7.71.0 <=7.71.0; version=7.71.1 <=7.71.1; version=7.72.0 <=7.72.0; version=7.73.0 <=7.73.0; version=7.74.0 <=7.74.0; version=7.75.0 <=7.75.0; version=7.76.0 <=7.76.0; version=7.76.1 <=7.76.1; version=7.77.0 <=7.77.0; version=7.78.0 <=7.78.0; version=7.79.0 <=7.79.0; version=7.79.1 <=7.79.1; version=7.80.0 <=7.80.0; version=7.81.0 <=7.81.0; version=7.82.0 <=7.82.0; version=7.83.0 <=7.83.0; version=7.83.1 <=7.83.1; version=7.84.0 <=7.84.0; version=7.85.0 <=7.85.0; version=7.86.0 <=7.86.0; version=7.87.0 <=7.87.0; version=7.88.0 <=7.88.0; version=7.88.1 <=7.88.1; version=8.0.0 <=8.0.0; version=8.0.1 <=8.0.1; version=8.1.0 <=8.1.0; version=8.1.1 <=8.1.1; version=8.1.2 <=8.1.2; version=8.2.0 <=8.2.0; version=8.2.1 <=8.2.1; version=8.3.0 <=8.3.0; version=8.4.0 <=8.4.0; version=8.5.0 <=8.5.0; version=8.6.0 <=8.6.0

Published CVSS scores

8.6CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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