CVE-2026-43620

MEDIUMNVD 5.56.5▲
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-05-20. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:vulncheck, epss, ghsa
5.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.5Exploit: NoneExposed: 0

A fix is available — apply it.

Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recv_files() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CF_INC_RECURSE in compatibility flags and sending a specially crafted file list where the first sorted entry is not the leading dot directory, followed by a transfer record with ndx=0 and an iflag word without ITEM_TRANSFER, causing the receiver to read 8 bytes before the allocated pointer array and dereference an invalid pointer at an unmapped address, resulting in a deterministic SIGSEGV crash of the rsync client.

CVSS v3
5.5
EG Score
6.5(medium)
EPSS
39.6%
KEV
Not listed

Published

May 20, 2026

Last Modified

July 14, 2026

Advisory Details (3)

Auto-updated May 20, 2026
Patch available. Sources: github.
generic

Rsync < 3.4.3 Out-of-Bounds Array Read via recv_files() | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rsync-out-of-bounds-array-read-via-recv-files
github Patch Available

rsync: receiver-side out-of-bounds read enables remote DoS from malicious server · Advisory · RsyncProject/rsync · GitHub

https://github.com/RsyncProject/rsync/security/advisories/GHSA-28pw-r563-rxvm
generic

Release v3.4.3 · RsyncProject/rsync · GitHub

https://github.com/RsyncProject/rsync/releases/tag/v3.4.3

Vendor Advisories for CVE-2026-43620(2)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntursync (3.4.1+ds1-7ubuntu0.2) @ resolute2026-06-29ubuntu
ubuntursync (3.1.3-8ubuntu0.9+esm1) @ focal2026-06-29ubuntu

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

(2)

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 8× in last 7d / 52× 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 138 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:00 UTCEPSS rescore
  3. 2026-07-14 21:22 UTCNVD updateCVSS v3 → 5.5
  4. 2026-07-13 22:30 UTCEPSS rescore
  5. 2026-07-13 06:13 UTCEPSS rescore
  6. 2026-07-12 05:46 UTCEPSS rescore
  7. 2026-07-11 08:27 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-08 15:16 UTCEPSS rescore
  10. 2026-07-07 13:46 UTCEPSS rescore
  11. 2026-07-06 16:27 UTCEPSS rescore
  12. 2026-07-06 02:23 UTCEPSS rescore
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 06:31 UTCEPSS rescore
  15. 2026-07-01 15:07 UTCEPSS rescore
  16. 2026-06-30 23:22 UTCEPSS rescore
  17. 2026-06-29 20:33 UTCEG score recompute
  18. 2026-06-29 20:33 UTCVendor advisory
  19. 2026-06-29 20:33 UTCGHSA enrichment
  20. 2026-06-29 14:06 UTCEPSS rescore
  21. 2026-06-28 14:07 UTCEPSS rescore
  22. 2026-06-28 04:56 UTCEPSS rescore
  23. 2026-06-27 20:19 UTCEG score recompute
  24. 2026-06-27 20:19 UTCVendor advisory
  25. 2026-06-27 20:19 UTCGHSA enrichment
Show 75 more
  1. 2026-06-27 03:08 UTCEPSS rescore
  2. 2026-06-26 19:41 UTCEG score recompute
  3. 2026-06-26 19:41 UTCVendor advisory
  4. 2026-06-26 19:41 UTCGHSA enrichment
  5. 2026-06-25 16:25 UTCEG score recompute
  6. 2026-06-25 16:25 UTCVendor advisory
  7. 2026-06-25 16:25 UTCGHSA enrichment
  8. 2026-06-25 13:49 UTCEPSS rescore
  9. 2026-06-25 13:49 UTCEPSS rescore
  10. 2026-06-24 14:05 UTCEPSS rescore
  11. 2026-06-23 21:33 UTCEPSS rescore
  12. 2026-06-22 14:25 UTCEPSS rescore
  13. 2026-06-22 14:25 UTCEPSS rescore
  14. 2026-06-21 14:56 UTCEPSS rescore
  15. 2026-06-21 14:56 UTCEPSS rescore
  16. 2026-06-21 01:59 UTCEPSS rescore
  17. 2026-06-19 19:25 UTCEPSS rescore
  18. 2026-06-18 17:52 UTCEPSS rescore
  19. 2026-06-18 17:52 UTCEPSS rescore
  20. 2026-06-17 20:05 UTCEG score recompute
  21. 2026-06-17 20:05 UTCVendor advisory
  22. 2026-06-17 20:05 UTCGHSA enrichment
  23. 2026-06-17 17:53 UTCEPSS rescore
  24. 2026-06-16 20:21 UTCEG score recompute
  25. 2026-06-16 20:21 UTCVendor advisory
  26. 2026-06-16 20:21 UTCGHSA enrichment
  27. 2026-06-16 17:52 UTCEPSS rescore
  28. 2026-06-15 17:49 UTCEPSS rescore
  29. 2026-06-15 15:53 UTCEG score recompute
  30. 2026-06-15 15:53 UTCVendor advisory
  31. 2026-06-15 15:53 UTCGHSA enrichment
  32. 2026-06-14 13:21 UTCEG score recompute
  33. 2026-06-14 13:21 UTCVendor advisory
  34. 2026-06-14 13:21 UTCGHSA enrichment
  35. 2026-06-13 23:00 UTCEPSS rescore
  36. 2026-06-13 14:39 UTCEG score recompute
  37. 2026-06-13 14:39 UTCVendor advisory
  38. 2026-06-13 14:39 UTCGHSA enrichment
  39. 2026-06-12 23:12 UTCEPSS rescore
  40. 2026-06-12 23:12 UTCEPSS rescore
  41. 2026-06-12 15:55 UTCEG score recompute
  42. 2026-06-12 15:55 UTCVendor advisory
  43. 2026-06-12 15:55 UTCGHSA enrichment
  44. 2026-06-11 16:46 UTCEG score recompute
  45. 2026-06-11 16:46 UTCVendor advisory
  46. 2026-06-11 16:46 UTCGHSA enrichment
  47. 2026-06-11 14:00 UTCEPSS rescore
  48. 2026-06-10 22:18 UTCEPSS rescore
  49. 2026-06-10 16:53 UTCEG score recompute
  50. 2026-06-10 16:53 UTCVendor advisory
  51. 2026-06-10 16:53 UTCGHSA enrichment
  52. 2026-06-10 13:22 UTCEPSS rescore
  53. 2026-06-10 13:22 UTCEPSS rescore
  54. 2026-06-09 18:11 UTCEG score recompute
  55. 2026-06-09 18:11 UTCVendor advisory
  56. 2026-06-09 18:11 UTCGHSA enrichment
  57. 2026-06-08 19:29 UTCEG score recompute
  58. 2026-06-08 19:29 UTCVendor advisory
  59. 2026-06-08 19:29 UTCGHSA enrichment
  60. 2026-06-08 14:17 UTCEPSS rescore
  61. 2026-06-08 14:17 UTCEPSS rescore
  62. 2026-06-07 17:57 UTCEG score recompute
  63. 2026-06-07 17:57 UTCVendor advisory
  64. 2026-06-07 17:57 UTCGHSA enrichment
  65. 2026-06-07 15:25 UTCEPSS rescore
  66. 2026-06-07 15:25 UTCEPSS rescore
  67. 2026-06-06 19:15 UTCEG score recompute
  68. 2026-06-06 19:15 UTCVendor advisory
  69. 2026-06-06 19:15 UTCGHSA enrichment
  70. 2026-06-06 13:47 UTCEPSS rescore
  71. 2026-06-06 13:47 UTCEPSS rescore
  72. 2026-06-05 22:47 UTCEPSS rescore
  73. 2026-06-05 20:33 UTCEG score recompute
  74. 2026-06-05 20:33 UTCVendor advisory
  75. 2026-06-05 20:33 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-43620?
CVE-2026-43620 is a medium vulnerability published on May 20, 2026. Rsync version 3.4.2 and prior contain a receiver-side out-of-bounds array read vulnerability in recvfiles() in receiver.c that allows a malicious rsync server to crash the rsync client process. Attackers can exploit the vulnerability by setting CFINCRECURSE in compatibility flags and sending a…
When was CVE-2026-43620 disclosed?
CVE-2026-43620 was first published in the National Vulnerability Database on May 20, 2026, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43620 actively exploited?
CVE-2026-43620 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43620?
CVE-2026-43620 has a CVSS v3 base score of 5.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 6.5.
How do I remediate CVE-2026-43620?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43620, 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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