CVE-2026-53783

HIGHPre-NVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

This high-severity CVE scores 8.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4% (29th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer processing. Attackers can additionally leverage unrestricted flags such as --copy-unsafe-links, -D, and --log-file through rrsync to read or write files outside the permitted directory subtree.

CVSS v3
8.1
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
29th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

August 13, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Aug 13, 2026
Patch available. Sources: github, github_release.
Web page

rsync < 3.5.0 TOCTOU Race Condition Directory Escape via rrsync | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rsync-toctou-race-condition-directory-escape-via-rrsync
GitHub release Patch Available

v3.5.0

Patch available: RsyncProject/rsync v3.5.0

https://github.com/RsyncProject/rsync/releases/tag/v3.5.0
GitHub advisoryMentions a patch (unverified)

rsync: rrsync restricted-directory escape (validation-vs-exec race + unsafe option allowlist) · Advisory · RsyncProject/rsync · GitHub

Affected: 3.5.0. (Precise introduced-in ranges being finalised.)

https://github.com/RsyncProject/rsync/security/advisories/GHSA-9cgc-64g4-3gv5

Vendor Advisories for CVE-2026-53783(3)

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 / EcosystemFix (by version range) / PatchReleasedSource
redhatrsync-0:3.1.3-28.el8_102026-09-30redhat
redhatrsync-0:3.2.7-1.el9_82026-09-14redhat
redhatrsync-0:3.5.0-3.el10_22026-09-14redhat

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

(7 across 7 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.5.0-r0: fixed in 3.5.0-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.5.0-r0: fixed in 3.5.0-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.5.0-r0: fixed in 3.5.0-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
rsync—
  • every version up to 3.5.0-r0: fixed in 3.5.0-r0
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
rsync3.2.7-1 ... 3.5.1+ds1-1 (32 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
rsync3.4.1+ds1-5 ... 3.4.4+ds1-1 (13 versions)
  • every version up to 3.5.0+ds1-0+deb13u1: fixed in 3.5.0+ds1-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
rsync3.4.1+ds1-5 ... 3.4.4+ds1-1 (9 versions)
  • every version up to 3.5.0+ds1-1: fixed in 3.5.0+ds1-1
—

Weakness Classification(2)

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 11× in last 7d / 80× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 142 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 42 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  3. 2026-10-12 15:57 UTCEG score recompute
  4. 2026-10-11 19:40 UTCEG score recompute
  5. 2026-10-11 16:55 UTCEG score recompute
  6. 2026-10-11 14:18 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  12. 2026-10-07 02:21 UTCEG score recompute
  13. 2026-10-07 02:21 UTCVendor advisory
  14. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  15. 2026-10-06 13:25 UTCEG score recompute
  16. 2026-10-06 13:25 UTCVendor advisory
  17. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  18. 2026-10-05 14:38 UTCEG score recompute
  19. 2026-10-05 14:38 UTCVendor advisory
  20. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  21. 2026-10-04 22:21 UTCVendor advisory
  22. 2026-10-04 08:24 UTCVendor advisory
  23. 2026-10-03 19:49 UTCEG score recompute
  24. 2026-10-03 19:49 UTCVendor advisory
  25. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 29th percentile
Show 75 more
  1. 2026-10-02 21:52 UTCEG score recompute
  2. 2026-10-02 21:52 UTCVendor advisory
  3. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 29th percentile
  4. 2026-10-02 07:34 UTCEG score recompute
  5. 2026-10-02 07:34 UTCVendor advisory
  6. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  7. 2026-10-01 10:21 UTCVendor advisory
  8. 2026-09-30 21:47 UTCEG score recompute
  9. 2026-09-30 21:47 UTCVendor advisory
  10. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 28th percentile
  11. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  12. 2026-09-29 04:05 UTCEG score recompute
  13. 2026-09-29 04:05 UTCVendor advisory
  14. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-09-28 13:21 UTCVendor advisory
  16. 2026-09-28 00:48 UTCEG score recompute
  17. 2026-09-28 00:48 UTCVendor advisory
  18. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-09-27 09:45 UTCEG score recompute
  20. 2026-09-27 09:45 UTCVendor advisory
  21. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  22. 2026-09-25 03:34 UTCEG score recompute
  23. 2026-09-25 03:34 UTCVendor advisory
  24. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-09-24 01:19 UTCEG score recompute
  26. 2026-09-24 01:19 UTCVendor advisory
  27. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  28. 2026-09-23 12:45 UTCVendor advisory
  29. 2026-09-22 23:49 UTCEG score recompute
  30. 2026-09-22 23:49 UTCVendor advisory
  31. 2026-09-22 10:46 UTCVendor advisory
  32. 2026-09-21 22:06 UTCEG score recompute
  33. 2026-09-21 22:06 UTCVendor advisory
  34. 2026-09-21 09:32 UTCEG score recompute
  35. 2026-09-21 09:32 UTCVendor advisory
  36. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  37. 2026-09-20 18:51 UTCVendor advisory
  38. 2026-09-20 05:02 UTCVendor advisory
  39. 2026-09-19 16:19 UTCEG score recompute
  40. 2026-09-19 16:19 UTCVendor advisory
  41. 2026-09-19 03:03 UTCEG score recompute
  42. 2026-09-19 03:03 UTCVendor advisory
  43. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  44. 2026-09-18 14:29 UTCVendor advisory
  45. 2026-09-18 01:53 UTCEG score recompute
  46. 2026-09-18 01:53 UTCVendor advisory
  47. 2026-09-17 13:19 UTCVendor advisory
  48. 2026-09-17 00:00 UTCEG score recompute
  49. 2026-09-17 00:00 UTCVendor advisory
  50. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  51. 2026-09-16 10:47 UTCEG score recompute
  52. 2026-09-16 10:47 UTCVendor advisory
  53. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  54. 2026-09-15 21:57 UTCVendor advisory
  55. 2026-09-15 09:23 UTCEG score recompute
  56. 2026-09-13 17:39 UTCEG score recompute
  57. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  58. 2026-09-12 16:31 UTCEG score recompute
  59. 2026-09-11 15:22 UTCEG score recompute
  60. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  61. 2026-09-10 14:14 UTCEG score recompute
  62. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  63. 2026-09-09 09:31 UTCEG score recompute
  64. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  65. 2026-09-07 18:18 UTCEG score recompute
  66. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  67. 2026-09-06 16:29 UTCEG score recompute
  68. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  69. 2026-09-06 03:55 UTCEG score recompute
  70. 2026-09-05 02:25 UTCEG score recompute
  71. 2026-09-04 13:49 UTCEG score recompute
  72. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  73. 2026-09-02 23:12 UTCEG score recompute
  74. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.4% · 30th percentile
  75. 2026-09-02 01:50 UTCEG score recompute

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-53783?
CVE-2026-53783 is a high-severity vulnerability; its CVE record was published on August 13, 2026. rsync before 3.5.0 contains a time-of-check to time-of-use (TOCTOU) race condition vulnerability in the rrsync restricted shell wrapper that allows authenticated clients to escape enforced directory restrictions by substituting a symlink for a path component after validation but before transfer…
When was the CVE record for CVE-2026-53783 published?
The CVE record for CVE-2026-53783 was published on August 13, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of September 8, 2026; the record at its source may have been updated since.
Is CVE-2026-53783 actively exploited?
CVE-2026-53783 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (29th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53783?
CVE-2026-53783 has a CVSS base score of 8.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53783?
A fix for CVE-2026-53783 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53783 are linked in the Vendor Advisories panel on this page.

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