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Not in CISA KEV
HIGH severity

CVE-2019-15545 — libp2p-core

HIGH

CVE-2019-15545 is a high-severity (CVSS 7.5) CWE-347 vulnerability in libp2p-core. A fix is available for libp2p-core — see the affected versions and patch details below.

Failure to properly verify ed25519 signatures in libp2p-core

Also known asGHSA-4q4x-67hx-5mpgRUSTSEC-2019-0004
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs56th percentile — riskier than 56% of all scored CVEsHighest risk
0.00%0.42%0.84%1.26%0.1%0.8%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🦀libp2p-core

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

Affected versions of this crate did not properly verify ed25519 signatures. Any signature with a correct length was considered valid. This allows an attacker to impersonate any node identity.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iolibp2p-coreall versions0.8.1cargo update -p libp2p-core --precise 0.8.1

Affected Products

1 product · 1 configurations
Application
libp2plibp2p
≥ 0.3 && < 0.8.1
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for libp2p-core, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update libp2p-core to 0.8.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-15545 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

Affected versions of this crate did not properly verify ed25519 signatures. Any signature with a correct length was considered valid. This allows an attacker to impersonate any node identity.
O3 Security · Impact-Aware SCA

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CVE-2019-15545: libp2p-core — Fixed in 0.8.1