CVE-2026-53788

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (18th 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
6.5EG
EchelonGraph verdictMonitorRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names communicated over the pipe-based line-oriented protocol to cause the rsync daemon to process attacker-influenced data as legitimate protocol input, corrupting uid/gid mapping logic.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
44
EG Risk 44/100

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)
Severity65% × 45%
The EG Score, 6.5 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
18th
KEV
Not listed

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

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (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 Newline Injection via name-converter uid/gid mapping | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rsync-newline-injection-via-name-converter-uid-gid-mapping
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: daemon name-converter accepts newline-bearing names into its line protocol · Advisory · RsyncProject/rsync · GitHub

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

https://github.com/RsyncProject/rsync/security/advisories/GHSA-p4c5-8c68-5fjq

Vendor Advisories for CVE-2026-53788(1)

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

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(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 43× 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.

  1. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  2. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.3% · 18th 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 0.3% · 18th percentile
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  9. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  10. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  11. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  12. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  13. 2026-10-06 13:25 UTCEG score recompute
  14. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  15. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  16. 2026-10-03 19:49 UTCEG score recompute
  17. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  18. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  19. 2026-10-02 07:34 UTCEG score recompute
  20. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  21. 2026-09-30 21:47 UTCEG score recompute
  22. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  23. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-09-28 11:18 UTCEG score recompute
Show 73 more
  1. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  2. 2026-09-27 09:45 UTCEG score recompute
  3. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  4. 2026-09-25 03:34 UTCEG score recompute
  5. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  6. 2026-09-24 00:11 UTCEG score recompute
  7. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  8. 2026-09-22 22:22 UTCEG score recompute
  9. 2026-09-21 20:45 UTCEG score recompute
  10. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  11. 2026-09-19 16:23 UTCEG score recompute
  12. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  13. 2026-09-18 14:51 UTCEG score recompute
  14. 2026-09-17 13:19 UTCEG score recompute
  15. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  16. 2026-09-16 10:55 UTCEG score recompute
  17. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  18. 2026-09-15 09:23 UTCEG score recompute
  19. 2026-09-14 07:50 UTCEG score recompute
  20. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  21. 2026-09-13 06:17 UTCEG score recompute
  22. 2026-09-12 04:44 UTCEG score recompute
  23. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  24. 2026-09-11 03:11 UTCEG score recompute
  25. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  26. 2026-09-10 01:38 UTCEG score recompute
  27. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  28. 2026-09-07 16:33 UTCEG score recompute
  29. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  30. 2026-09-06 06:21 UTCEG score recompute
  31. 2026-09-05 04:47 UTCEG score recompute
  32. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  33. 2026-09-03 01:02 UTCEG score recompute
  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  35. 2026-09-01 23:07 UTCEG score recompute
  36. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  37. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  38. 2026-08-31 21:34 UTCEG score recompute
  39. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  40. 2026-08-30 16:41 UTCEG score recompute
  41. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  42. 2026-08-29 15:09 UTCEG score recompute
  43. 2026-08-28 21:41 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  44. 2026-08-28 13:13 UTCEG score recompute
  45. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  46. 2026-08-27 11:29 UTCEG score recompute
  47. 2026-08-26 14:46 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  48. 2026-08-26 09:56 UTCEG score recompute
  49. 2026-08-25 13:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  50. 2026-08-25 08:08 UTCEG score recompute
  51. 2026-08-23 04:58 UTCEG score recompute
  52. 2026-08-23 00:19 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  53. 2026-08-22 03:26 UTCEG score recompute
  54. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  55. 2026-08-21 01:53 UTCEG score recompute
  56. 2026-08-20 22:55 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  57. 2026-08-20 00:19 UTCEG score recompute
  58. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  59. 2026-08-18 22:47 UTCEG score recompute
  60. 2026-08-18 13:48 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  61. 2026-08-17 21:09 UTCEG score recompute
  62. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  63. 2026-08-16 19:36 UTCEG score recompute
  64. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  65. 2026-08-16 02:14 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  66. 2026-08-15 18:04 UTCEG score recompute
  67. 2026-08-15 01:30 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  68. 2026-08-14 16:32 UTCEG score recompute
  69. 2026-08-14 16:04 UTCEG score recompute
  70. 2026-08-14 13:14 UTCEG score recompute
  71. 2026-08-13 15:24 UTCEG score recompute
  72. 2026-08-13 15:12 UTCEG score recomputeFirst assessed: 6.5 MEDIUM
  73. 2026-08-13 15:11 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-53788?
CVE-2026-53788 is a medium-severity vulnerability; its CVE record was published on August 13, 2026. rsync before 3.5.0 contains a newline injection vulnerability in the name-converter uid/gid mapping interface that allows local attackers to forge protocol messages by creating user or group names containing newline characters. Attackers can inject malicious newline characters into names…
When was CVE-2026-53788 made public?
CVE-2026-53788 was made public on August 12, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on August 13, 2026. 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-2026-53788 actively exploited?
CVE-2026-53788 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (18th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53788?
CVE-2026-53788 has a CVSS base score of 6.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53788?
A fix for CVE-2026-53788 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53788 are linked in the Vendor Advisories panel on this page.

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