CVE-2026-70455

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5%, top 61% 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
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N with a large value to spawn an unbounded number of Zstandard worker threads on the receiver, exhausting available thread and memory resources.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: Track

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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 26, 2026

Advisory Details (3)

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

rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion | Advisories | VulnCheck

https://www.vulncheck.com/advisories/rsync-dos-via-zt-zstandard-compression-thread-exhaustion
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 Patch Available

rsync: Peer-controlled Zstandard worker exhaustion on an rsync daemon · Advisory · RsyncProject/rsync · GitHub

https://github.com/RsyncProject/rsync/security/advisories/GHSA-rjvj-qgqg-cvx9

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 19× in last 7d / 44× 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.

  1. 2026-08-30 01:22 UTCEPSS rescore
  2. 2026-08-29 20:45 UTCVendor advisory
  3. 2026-08-29 07:40 UTCEG score recompute
  4. 2026-08-29 07:40 UTCVendor advisory
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 10:10 UTCVendor advisory
  7. 2026-08-27 20:38 UTCEG score recompute
  8. 2026-08-27 20:38 UTCVendor advisory
  9. 2026-08-27 07:17 UTCVendor advisory
  10. 2026-08-26 17:26 UTCEG score recompute
  11. 2026-08-26 17:26 UTCVendor advisory
  12. 2026-08-26 14:47 UTCEPSS rescore
  13. 2026-08-26 08:26 UTCVendor advisory
  14. 2026-08-25 19:23 UTCEG score recompute
  15. 2026-08-25 19:23 UTCVendor advisory
  16. 2026-08-25 13:49 UTCEPSS rescore
  17. 2026-08-25 06:18 UTCVendor advisory
  18. 2026-08-24 17:15 UTCEG score recompute
  19. 2026-08-24 17:15 UTCVendor advisory
  20. 2026-08-23 00:51 UTCEG score recompute
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-22 11:47 UTCEG score recompute
  23. 2026-08-21 23:49 UTCEPSS rescore
  24. 2026-08-21 09:39 UTCEG score recompute
  25. 2026-08-20 22:56 UTCEPSS rescore
Show 19 more
  1. 2026-08-19 18:28 UTCEG score recompute
  2. 2026-08-19 17:04 UTCEPSS rescore
  3. 2026-08-18 15:43 UTCEG score recompute
  4. 2026-08-18 13:49 UTCEPSS rescore
  5. 2026-08-18 13:49 UTCEPSS rescore
  6. 2026-08-18 02:39 UTCEG score recompute
  7. 2026-08-17 13:47 UTCEPSS rescore
  8. 2026-08-17 00:33 UTCEG score recompute
  9. 2026-08-16 14:56 UTCEPSS rescore
  10. 2026-08-16 14:56 UTCEPSS rescore
  11. 2026-08-16 11:29 UTCEG score recompute
  12. 2026-08-16 02:15 UTCEPSS rescore
  13. 2026-08-15 09:22 UTCEG score recompute
  14. 2026-08-15 01:31 UTCEPSS rescore
  15. 2026-08-14 20:18 UTCEG score recompute
  16. 2026-08-14 13:14 UTCEG score recompute
  17. 2026-08-13 15:23 UTCEG score recompute
  18. 2026-08-13 15:12 UTCEG score recompute
  19. 2026-08-13 15:11 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-70455?
CVE-2026-70455 is a high vulnerability published on August 13, 2026. rsync 3.4.2 before 3.5.0 contains a denial of service vulnerability that allows a remote sender to exhaust system resources by specifying the --zt short alias for --compress-threads, which bypasses the refuse options directive's string matching on long option names. Attackers can specify --zt=N…
When was CVE-2026-70455 disclosed?
CVE-2026-70455 was first published in the National Vulnerability Database on August 13, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-70455 actively exploited?
CVE-2026-70455 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.7% of all scored CVEs.
What is the CVSS score of CVE-2026-70455?
CVE-2026-70455 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-70455?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-70455, 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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