CVE-2026-47783

HIGHPre-NVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-20. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 8.1Exploit: NoneExposed: 0

A fix is available — apply it.

In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by sasl_server_userdb_checkpass.

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
67.3%
KEV
Not listed

Published

May 20, 2026

Last Modified

June 30, 2026

Advisory Details (3)

Auto-updated May 20, 2026
No patch confirmed yet.
generic

ReleaseNotes1642 · memcached/memcached Wiki · GitHub

https://github.com/memcached/memcached/wiki/ReleaseNotes1642
generic

Comparing 1.6.41...1.6.42 · memcached/memcached · GitHub

https://github.com/memcached/memcached/compare/1.6.41...1.6.42
generic

Fix timing side-channel in SASL password database authentication · memcached/memcached@d13f282 · GitHub

https://github.com/memcached/memcached/commit/d13f282b4bce33a9c33b8a1bbf07f12114160fed

Vendor Advisories for CVE-2026-47783(2)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntumemcached (1.6.38-1ubuntu0.1) @ questing2026-06-29ubuntu
redhatmemcached-0:1.6.23-7.el10_2.12026-06-22redhat
redhatmemcached-0:1.6.9-7.el9_8.12026-06-22redhat

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.

Weakness Classification(1)

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

Additional Vendor Advisories

(3)

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 7× in last 7d / 87× 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 182 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-47783?
CVE-2026-47783 is a high vulnerability published on May 20, 2026. In memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid username is found by saslserveruserdb_checkpass.
When was CVE-2026-47783 disclosed?
CVE-2026-47783 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on June 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-47783 actively exploited?
CVE-2026-47783 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-47783?
CVE-2026-47783 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-47783?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-47783, 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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