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CVE-2026-49866 libp2p: CPU DoS via oversized IHAVE and IWANT control message arrays

🗓️ 08 Jul 2026 20:47:09Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 48 Views

Libp2p CPU DoS from oversized IHAVE and IWANT arrays due to Infinity limits; fixed in 16.0.0.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-49866
8 Jul 202620:47
–attackerkb
circl
Circl
CVE-2026-49866
10 Jul 202616:41
–circl
cve
CVE
CVE-2026-49866
8 Jul 202620:47
–cve
euvd
EUVD
EUVD-2026-42409
10 Jul 202616:04
–euvd
github
Github Security Blog
libp2p: CPU DoS via oversized IHAVE and IWANT control message arrays
10 Jul 202616:04
–github
mend
Mend
CVE-2026-49866
8 Jul 202620:47
–mend
nvd
NVD
CVE-2026-49866
8 Jul 202621:16
–nvd
osv_ghsa
osv_ghsa
GHSA-CWC9-CP4J-MCVV libp2p: CPU DoS via oversized IHAVE and IWANT control message arrays
10 Jul 202616:04
–osv_ghsa
ptsecurity
Positive Technologies
PT-2026-56603
8 Jul 202600:00
–ptsecurity
rapid7
Rapid7 Vulnerability Database (full)
CVE-2026-49866: Allocation of Resources Without Limits or Throttling
8 Jul 202600:00
–rapid7
Rows per page
[
  {
    "vendor": "libp2p",
    "product": "js-libp2p",
    "versions": [
      {
        "version": "< 16.0.0",
        "status": "affected"
      }
    ]
  }
]

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08 Jul 2026 20:47Current
CVSS 3.17.5
EPSS0.0063
SSVC
48