CVE-2023-39326

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2023-12-06. NVD baseline CVSS 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.3Exploit: NoneExposed: 0

A fix is available — apply it.

A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
64.7%
KEV
Not listed

Published

December 6, 2023

Last Modified

November 21, 2024

References (10)

Vendor Advisories for CVE-2023-39326(20)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(29)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatnetwork-observability/network-observability-rhel9-operator:v1.6.0-662024-06-17redhat
redhatrhosp-rhel9/osp-director-operator-bundle:1.3.1-272024-05-29redhat
redhatrhosp-rhel8/osp-director-operator-bundle:1.3.0-262024-05-29redhat
redhatetcd-0:3.3.23-16.el8ost2024-05-29redhat
redhatmta/mta-cli-rhel9:7.0.3-162024-05-23redhat
redhatcontainer-tools:rhel8-8100020240227110532.828888972024-05-22redhat
redhatcollectd-sensubility-0:0.2.1-3.el9ost2024-05-22redhat
redhatetcd-0:3.4.26-8.el9ost2024-05-22redhat
redhatcollectd-sensubility-0:0.2.1-3.el8ost2024-05-22redhat
redhatcontainernetworking-plugins-1:1.4.0-2.el9_42024-04-30redhat
redhatbuildah-2:1.33.6-2.el92024-04-30redhat
redhatpodman-2:4.9.4-0.1.el92024-04-30redhat
redhattoolbox-0:0.0.99.5-2.el92024-04-30redhat
redhatopenshift4/ovirt-csi-driver-rhel8-operator:v4.12.0-202404170201.p0.ge5e0233.assembly.stream.el82024-04-25redhat
redhatservice-interconnect/skupper-site-controller-rhel9:1.5.3-22024-04-18redhat
redhatoadp/oadp-velero-rhel9:1.3.1-162024-04-16redhat
redhatcustom-metrics-autoscaler/custom-metrics-autoscaler-rhel8-operator:2.12.1-3762024-04-15redhat
redhatreceptor-0:1.4.5-1.el9ap2024-04-02redhat
redhatmigration-toolkit-virtualization/mtv-api-rhel9:2.5.6-82024-03-20redhat
redhatrhosdt/tempo-rhel8-operator:0.8.0-32024-03-20redhat
redhatrhc-worker-script-0:0.6-1.el7_92024-03-11redhat
redhatopenshift-secondary-scheduler-operator/secondary-scheduler-rhel9-operator:v1.2-262024-03-06redhat
redhatgolang-0:1.20.12-1.el9_32024-03-05redhat
redhatskopeo-2:1.13.3-4.el9_32024-03-05redhat
redhatstf/sg-core-rhel8:5.2.1-62024-03-05redhat
redhatgo-toolset-1.19-golang-0:1.19.13-5.el7_92024-02-29redhat
redhatrun-once-duration-override-operator/run-once-duration-override-rhel9-operator:v1.1-52024-02-28redhat
redhatopenshift4/ovirt-csi-driver-rhel9:v4.15.0-202401261531.p0.gb8d25ad.assembly.stream2024-02-27redhat
redhatskopeo-2:1.11.2-21.1.rhaos4.15.el82024-02-27redhat

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)
Go(1)
PackageVulnerable rangeFixed inDependents
stdlib—1.21.5—

Additional Vendor Advisories

(20)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 9× in last 7d / 45× 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. 2026-07-11 08:26 UTCEPSS rescore
  2. 2026-07-11 08:26 UTCEPSS rescore
  3. 2026-07-09 19:08 UTCEPSS rescore
  4. 2026-07-08 15:13 UTCEPSS rescore
  5. 2026-07-07 13:44 UTCEPSS rescore
  6. 2026-07-06 16:26 UTCEPSS rescore
  7. 2026-07-06 16:26 UTCEPSS rescore
  8. 2026-07-06 02:22 UTCEPSS rescore
  9. 2026-07-05 02:29 UTCEPSS rescore
  10. 2026-07-04 06:29 UTCEPSS rescore
  11. 2026-07-01 15:05 UTCEPSS rescore
  12. 2026-06-30 23:21 UTCEPSS rescore
  13. 2026-06-30 23:21 UTCEPSS rescore
  14. 2026-06-29 14:05 UTCEPSS rescore
  15. 2026-06-28 04:55 UTCEPSS rescore
  16. 2026-06-28 04:55 UTCEPSS rescore
  17. 2026-06-27 03:07 UTCEPSS rescore
  18. 2026-06-27 03:07 UTCEPSS rescore
  19. 2026-06-27 02:39 UTCOSV refresh
  20. 2026-06-25 13:48 UTCEPSS rescore
  21. 2026-06-25 13:48 UTCEPSS rescore
  22. 2026-06-24 14:04 UTCEPSS rescore
  23. 2026-06-24 14:04 UTCEPSS rescore
  24. 2026-06-23 21:31 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
Show 62 more
  1. 2026-06-22 14:24 UTCEPSS rescore
  2. 2026-06-22 14:24 UTCEPSS rescore
  3. 2026-06-21 14:55 UTCEPSS rescore
  4. 2026-06-21 14:55 UTCEPSS rescore
  5. 2026-06-21 01:58 UTCEPSS rescore
  6. 2026-06-21 01:58 UTCEPSS rescore
  7. 2026-06-19 19:24 UTCEPSS rescore
  8. 2026-06-19 19:24 UTCEPSS rescore
  9. 2026-06-18 17:51 UTCEPSS rescore
  10. 2026-06-17 17:51 UTCEPSS rescore
  11. 2026-06-17 17:51 UTCEPSS rescore
  12. 2026-06-16 17:51 UTCEPSS rescore
  13. 2026-06-16 17:51 UTCEPSS rescore
  14. 2026-06-15 17:47 UTCEPSS rescore
  15. 2026-06-15 17:47 UTCEPSS rescore
  16. 2026-06-14 23:16 UTCEPSS rescore
  17. 2026-06-13 22:59 UTCEPSS rescore
  18. 2026-06-13 22:59 UTCEPSS rescore
  19. 2026-06-12 23:10 UTCEPSS rescore
  20. 2026-06-12 23:10 UTCEPSS rescore
  21. 2026-06-11 13:59 UTCEPSS rescore
  22. 2026-06-11 13:59 UTCEPSS rescore
  23. 2026-06-10 22:17 UTCEPSS rescore
  24. 2026-06-10 13:21 UTCEPSS rescore
  25. 2026-06-10 13:21 UTCEPSS rescore
  26. 2026-06-09 13:17 UTCOSV refresh
  27. 2026-06-08 14:16 UTCEPSS rescore
  28. 2026-06-08 14:16 UTCEPSS rescore
  29. 2026-06-07 15:23 UTCEPSS rescore
  30. 2026-06-07 15:23 UTCEPSS rescore
  31. 2026-06-06 13:46 UTCEPSS rescore
  32. 2026-06-06 13:46 UTCEPSS rescore
  33. 2026-06-05 22:46 UTCEPSS rescore
  34. 2026-06-05 22:46 UTCEPSS rescore
  35. 2026-06-05 06:09 UTCEPSS rescore
  36. 2026-06-05 06:09 UTCEPSS rescore
  37. 2026-06-04 13:11 UTCEPSS rescore
  38. 2026-06-04 13:11 UTCEPSS rescore
  39. 2026-06-02 20:12 UTCEPSS rescore
  40. 2026-06-02 20:12 UTCEPSS rescore
  41. 2026-06-02 20:12 UTCEPSS rescore
  42. 2026-06-01 13:51 UTCEPSS rescore
  43. 2026-06-01 13:51 UTCEPSS rescore
  44. 2026-05-31 22:30 UTCEPSS rescore
  45. 2026-05-31 22:29 UTCEPSS rescore
  46. 2026-05-31 22:29 UTCEPSS rescore
  47. 2026-05-31 00:15 UTCEPSS rescore
  48. 2026-05-31 00:15 UTCEPSS rescore
  49. 2026-05-29 13:43 UTCEPSS rescore
  50. 2026-05-29 13:43 UTCEPSS rescore
  51. 2026-05-28 13:43 UTCEPSS rescore
  52. 2026-05-28 13:43 UTCEPSS rescore
  53. 2026-05-27 13:39 UTCEPSS rescore
  54. 2026-05-26 13:43 UTCEPSS rescore
  55. 2026-05-26 13:43 UTCEPSS rescore
  56. 2026-05-26 07:18 UTCEPSS rescore
  57. 2026-05-26 07:18 UTCEPSS rescore
  58. 2026-05-26 07:18 UTCEPSS rescore
  59. 2026-05-24 16:52 UTCEPSS rescore
  60. 2026-05-24 12:40 UTCEG score recompute
  61. 2026-05-24 12:40 UTCVendor advisory
  62. 2026-05-24 12:40 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-39326?
CVE-2023-39326 is a medium vulnerability published on December 6, 2023. A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about…
When was CVE-2023-39326 disclosed?
CVE-2023-39326 was first published in the National Vulnerability Database on December 6, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-39326 actively exploited?
CVE-2023-39326 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 64.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-39326?
CVE-2023-39326 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2023-39326?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39326, 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.

Dependency Blast Radius

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