CVE-2026-73568

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-07-24. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, 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.

py-libp2p is the Python implementation of the libp2p networking stack. In 0.7.0 and earlier, the yamux handle_incoming() method in libp2p/stream_muxer/yamux/yamux.py reads an attacker-controlled 32-bit DATA frame length with read_exactly() before validating it against MAX_WINDOW_SIZE or checking whether stream_id exists. A peer that completes the standard Noise handshake can send a 12-byte frame declaring a 0xFFFFFFFF body and then withhold the body, causing the sequential yamux read loop used by the default new_host() configuration to block and preventing every stream on that connection from making progress. No fixed version is available as of this review.

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
28%
KEV
Not listed

Published

August 13, 2026

Last Modified

August 13, 2026

Advisory Details (2)

Auto-updated Aug 13, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit.
github_commit

commit 146ea87d1a20 (libp2p/py-libp2p)

Fix landed in libp2p/py-libp2p commit 146ea87d1a20 — awaiting tagged release

https://github.com/libp2p/py-libp2p/commit/146ea87d1a20cc7dacf684ecf7c204543be04b37
github Patch Available🟡 PoC Available

yamux connection DoS via oversized data frame · Advisory · libp2p/py-libp2p · GitHub

https://github.com/libp2p/py-libp2p/security/advisories/GHSA-hmj8-5xmh-5573

Vendor Advisories for CVE-2026-73568(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
piplibp2p—ghsa

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.

Data Freshness Timeline

(refreshed 24× in last 7d / 66× 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 20:30 UTCGHSA enrichment
  3. 2026-08-29 07:33 UTCEG score recompute
  4. 2026-08-29 07:33 UTCGHSA enrichment
  5. 2026-08-28 21:42 UTCEPSS rescore
  6. 2026-08-28 10:08 UTCGHSA enrichment
  7. 2026-08-27 21:01 UTCEG score recompute
  8. 2026-08-27 21:01 UTCGHSA enrichment
  9. 2026-08-27 14:25 UTCEPSS rescore
  10. 2026-08-27 08:04 UTCGHSA enrichment
  11. 2026-08-26 19:06 UTCEG score recompute
  12. 2026-08-26 19:06 UTCGHSA enrichment
  13. 2026-08-26 14:47 UTCEPSS rescore
  14. 2026-08-26 06:10 UTCGHSA enrichment
  15. 2026-08-25 17:12 UTCEG score recompute
  16. 2026-08-25 17:12 UTCGHSA enrichment
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 04:06 UTCGHSA enrichment
  19. 2026-08-24 15:09 UTCEG score recompute
  20. 2026-08-24 15:09 UTCGHSA enrichment
  21. 2026-08-24 02:12 UTCEG score recompute
  22. 2026-08-24 02:12 UTCGHSA enrichment
  23. 2026-08-23 13:11 UTCEG score recompute
  24. 2026-08-23 13:11 UTCGHSA enrichment
  25. 2026-08-23 00:19 UTCEPSS rescore
Show 41 more
  1. 2026-08-23 00:07 UTCGHSA enrichment
  2. 2026-08-22 11:11 UTCEG score recompute
  3. 2026-08-22 11:11 UTCGHSA enrichment
  4. 2026-08-21 23:49 UTCEPSS rescore
  5. 2026-08-21 22:14 UTCGHSA enrichment
  6. 2026-08-21 09:17 UTCEG score recompute
  7. 2026-08-21 09:17 UTCGHSA enrichment
  8. 2026-08-20 22:56 UTCEPSS rescore
  9. 2026-08-20 20:20 UTCGHSA enrichment
  10. 2026-08-20 07:24 UTCGHSA enrichment
  11. 2026-08-19 18:27 UTCEG score recompute
  12. 2026-08-19 18:27 UTCGHSA enrichment
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-19 04:45 UTCGHSA enrichment
  15. 2026-08-18 15:48 UTCEG score recompute
  16. 2026-08-18 15:48 UTCGHSA enrichment
  17. 2026-08-18 13:49 UTCEPSS rescore
  18. 2026-08-18 13:49 UTCEPSS rescore
  19. 2026-08-18 02:51 UTCGHSA enrichment
  20. 2026-08-17 13:54 UTCEG score recompute
  21. 2026-08-17 13:54 UTCGHSA enrichment
  22. 2026-08-17 13:47 UTCEPSS rescore
  23. 2026-08-17 00:58 UTCEG score recompute
  24. 2026-08-17 00:58 UTCGHSA enrichment
  25. 2026-08-16 14:56 UTCEPSS rescore
  26. 2026-08-16 14:56 UTCEPSS rescore
  27. 2026-08-16 12:02 UTCEG score recompute
  28. 2026-08-16 12:02 UTCGHSA enrichment
  29. 2026-08-16 02:15 UTCEPSS rescore
  30. 2026-08-15 23:06 UTCGHSA enrichment
  31. 2026-08-15 10:09 UTCEG score recompute
  32. 2026-08-15 10:09 UTCGHSA enrichment
  33. 2026-08-15 01:31 UTCEPSS rescore
  34. 2026-08-14 21:12 UTCGHSA enrichment
  35. 2026-08-14 08:16 UTCGHSA enrichment
  36. 2026-08-13 19:19 UTCGHSA enrichment
  37. 2026-08-13 18:18 UTCEG score recompute
  38. 2026-08-13 18:18 UTCGHSA enrichment
  39. 2026-08-13 17:47 UTCEG score recompute
  40. 2026-08-13 17:47 UTCGHSA enrichment
  41. 2026-08-13 17:46 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-73568?
CVE-2026-73568 is a high vulnerability published on August 13, 2026. py-libp2p is the Python implementation of the libp2p networking stack. In 0.7.0 and earlier, the yamux handleincoming() method in libp2p/streammuxer/yamux/yamux.py reads an attacker-controlled 32-bit DATA frame length with readexactly() before validating it against MAXWINDOWSIZE or checking whether…
When was CVE-2026-73568 disclosed?
CVE-2026-73568 was first published in the National Vulnerability Database on August 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-73568 actively exploited?
CVE-2026-73568 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 72.2% of all scored CVEs.
What is the CVSS score of CVE-2026-73568?
CVE-2026-73568 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-73568?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-73568, 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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