CVE-2026-49017

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 76% 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, secondary
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

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

In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently unresponsive with increasing CPU and memory consumption. An authenticated attacker can systematically exhaust all proxy-server workers, resulting in denial of service. The defect was introduced in Swift 2.36.0.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
—
EPSS
24.5%
KEV
Not listed

Published

May 27, 2026

Last Modified

June 2, 2026

Advisory Details (5)

Auto-updated Jun 12, 2026
No patch confirmed yet.
generic

oss-security - [OSSA-2026-014] OpenStack Swift: Errata 1 - Proxy-server denial of service via truncated s3api chunked upload, (CVE-2026-49017)

http://www.openwall.com/lists/oss-security/2026/06/02/6
generic

oss-security - [OSSA-2026-014] OpenStack Swift: Swift proxy-server denial of service via truncated s3api chunked upload (CVE-2026-49017)

http://www.openwall.com/lists/oss-security/2026/05/27/9
generic
https://review.opendev.org/c/openstack/swift/+/988093
generic
https://review.opendev.org/c/openstack/swift/+/987957
generic

Bug #2152205 “[OSSA-2026-014] Swift proxy-server denial of servi...” : Bugs : OpenStack Object Storage (swift)

https://bugs.launchpad.net/bugs/2152205

Vendor Advisories for CVE-2026-49017(1)

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

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
swift2.36.0, 2.36.1——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 41× 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 126 total refreshes for this CVE.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-21 15:25 UTCEPSS rescore
  3. 2026-07-20 17:08 UTCEPSS rescore
  4. 2026-07-19 05:22 UTCOSV refresh
  5. 2026-07-19 02:29 UTCEPSS rescore
  6. 2026-07-18 10:04 UTCEPSS rescore
  7. 2026-07-16 17:03 UTCEPSS rescore
  8. 2026-07-15 16:57 UTCEPSS rescore
  9. 2026-07-15 02:00 UTCEPSS rescore
  10. 2026-07-13 22:30 UTCEPSS rescore
  11. 2026-07-13 06:13 UTCEPSS rescore
  12. 2026-07-12 05:46 UTCEPSS rescore
  13. 2026-07-11 08:27 UTCEPSS rescore
  14. 2026-07-09 19:10 UTCEPSS rescore
  15. 2026-07-08 15:16 UTCEPSS rescore
  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-06 16:27 UTCEPSS rescore
  18. 2026-07-06 02:23 UTCEPSS rescore
  19. 2026-07-05 02:30 UTCEPSS rescore
  20. 2026-07-04 06:31 UTCEPSS rescore
  21. 2026-07-01 15:07 UTCEPSS rescore
  22. 2026-07-01 11:49 UTCGHSA enrichment
  23. 2026-06-30 23:22 UTCEPSS rescore
  24. 2026-06-29 14:45 UTCGHSA enrichment
  25. 2026-06-29 14:06 UTCEPSS rescore
Show 75 more
  1. 2026-06-29 14:06 UTCEPSS rescore
  2. 2026-06-28 22:23 UTCGHSA enrichment
  3. 2026-06-28 14:07 UTCEPSS rescore
  4. 2026-06-28 07:29 UTCGHSA enrichment
  5. 2026-06-28 04:56 UTCEPSS rescore
  6. 2026-06-28 04:56 UTCEPSS rescore
  7. 2026-06-27 18:47 UTCGHSA enrichment
  8. 2026-06-27 06:57 UTCGHSA enrichment
  9. 2026-06-27 03:08 UTCEPSS rescore
  10. 2026-06-26 17:26 UTCGHSA enrichment
  11. 2026-06-25 20:30 UTCGHSA enrichment
  12. 2026-06-25 13:49 UTCEPSS rescore
  13. 2026-06-25 09:33 UTCGHSA enrichment
  14. 2026-06-24 14:05 UTCEPSS rescore
  15. 2026-06-23 21:33 UTCEPSS rescore
  16. 2026-06-23 21:33 UTCEPSS rescore
  17. 2026-06-22 14:25 UTCEPSS rescore
  18. 2026-06-22 14:25 UTCEPSS rescore
  19. 2026-06-21 14:56 UTCEPSS rescore
  20. 2026-06-21 14:56 UTCEPSS rescore
  21. 2026-06-21 01:59 UTCEPSS rescore
  22. 2026-06-21 01:59 UTCEPSS rescore
  23. 2026-06-19 19:26 UTCEPSS rescore
  24. 2026-06-19 19:26 UTCEPSS rescore
  25. 2026-06-18 17:52 UTCEPSS rescore
  26. 2026-06-18 17:52 UTCEPSS rescore
  27. 2026-06-18 01:49 UTCGHSA enrichment
  28. 2026-06-17 17:53 UTCEPSS rescore
  29. 2026-06-17 14:25 UTCGHSA enrichment
  30. 2026-06-17 03:27 UTCGHSA enrichment
  31. 2026-06-16 17:53 UTCEPSS rescore
  32. 2026-06-16 16:30 UTCGHSA enrichment
  33. 2026-06-16 03:44 UTCGHSA enrichment
  34. 2026-06-15 17:49 UTCEPSS rescore
  35. 2026-06-15 17:49 UTCEPSS rescore
  36. 2026-06-15 16:47 UTCGHSA enrichment
  37. 2026-06-15 05:50 UTCGHSA enrichment
  38. 2026-06-14 23:18 UTCEPSS rescore
  39. 2026-06-14 18:54 UTCGHSA enrichment
  40. 2026-06-14 07:58 UTCGHSA enrichment
  41. 2026-06-13 23:00 UTCEPSS rescore
  42. 2026-06-13 21:02 UTCGHSA enrichment
  43. 2026-06-13 09:35 UTCGHSA enrichment
  44. 2026-06-12 23:12 UTCEPSS rescore
  45. 2026-06-12 23:12 UTCEPSS rescore
  46. 2026-06-12 22:35 UTCGHSA enrichment
  47. 2026-06-12 11:39 UTCGHSA enrichment
  48. 2026-06-12 00:43 UTCGHSA enrichment
  49. 2026-06-11 14:00 UTCEPSS rescore
  50. 2026-06-11 13:47 UTCGHSA enrichment
  51. 2026-06-11 02:51 UTCGHSA enrichment
  52. 2026-06-10 22:19 UTCEPSS rescore
  53. 2026-06-10 15:55 UTCGHSA enrichment
  54. 2026-06-10 13:22 UTCEPSS rescore
  55. 2026-06-10 13:22 UTCEPSS rescore
  56. 2026-06-10 04:58 UTCGHSA enrichment
  57. 2026-06-09 18:02 UTCGHSA enrichment
  58. 2026-06-09 07:06 UTCGHSA enrichment
  59. 2026-06-08 20:09 UTCGHSA enrichment
  60. 2026-06-08 14:17 UTCEPSS rescore
  61. 2026-06-08 14:17 UTCEPSS rescore
  62. 2026-06-08 09:13 UTCGHSA enrichment
  63. 2026-06-07 22:16 UTCGHSA enrichment
  64. 2026-06-07 15:25 UTCEPSS rescore
  65. 2026-06-07 15:25 UTCEPSS rescore
  66. 2026-06-07 11:20 UTCGHSA enrichment
  67. 2026-06-07 00:24 UTCGHSA enrichment
  68. 2026-06-06 13:47 UTCEPSS rescore
  69. 2026-06-06 13:47 UTCEPSS rescore
  70. 2026-06-06 13:27 UTCGHSA enrichment
  71. 2026-06-06 02:31 UTCGHSA enrichment
  72. 2026-06-05 22:47 UTCEPSS rescore
  73. 2026-06-05 15:34 UTCGHSA enrichment
  74. 2026-06-05 06:10 UTCEPSS rescore
  75. 2026-06-05 06:10 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-49017?
CVE-2026-49017 is a high vulnerability published on May 27, 2026. In OpenStack Swift before 2.36.2 and 2.37.2, s3api middleware enters an infinite loop when processing a truncated aws-chunked PUT request body. The StreamingInput class repeatedly appends an empty buffer and re-reads, causing the proxy-server worker handling the request to become permanently…
When was CVE-2026-49017 disclosed?
CVE-2026-49017 was first published in the National Vulnerability Database on May 27, 2026, with the most recent update on June 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-49017 actively exploited?
CVE-2026-49017 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 24.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-49017?
CVE-2026-49017 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-49017?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49017, 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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