CVE-2026-77384 json
libp2p: Circuit relay v2 server reservation refresh leaks abort listeners and allows remote resource exhaustion
published 2mo ago modified 30d ago also EUVD-2026-65154 , GHSA-x787-gh7p-hmq7
Unreviewed: the maintainers' own advisory
Published by the maintainers on their GitHub repository libp2p/js-libp2p. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.
- cvss
- 7.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.6%
- EPSS 0.6% chance of exploitation in 30 days, percentile 49%
- public exploits
- 0
- none known
Summary
libp2p is a JavaScript implementation of the libp2p networking stack. Prior to version 4.2.9, the reservation refresh path in reservation-store.ts reuses the same retimeableSignal but unconditionally registers another abort listener on every refresh. As a result, a remote peer can repeatedly send valid RESERVE requests for the same reservation, causing unbounded listener and closure growth in @libp2p/circuit-relay-v2 relay servers and leading to denial of service. This issue is fixed in version 4.2.9.
Patch / fix
- npm @libp2p/circuit-relay-v2 4.2.9
- protocol libp2p 4.2.9
Is CVE-2026-77384 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- yes
- Technical impact
- partial
- Assessed
- 2mo ago
Exploit prediction
0.61% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-11).
Exploits and checks
- github.com https://github.com/libp2p/js-libp2p/security/advisories/GHSA-x787-gh7p-hmq7 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @libp2p/circuit-relay-v2 | >=2.1.5, <4.2.9 |
4.2.9 |
Affected products
- libp2p js-libp2p
Classification
References
Sources
- CVE List CVE-2026-77384
- NVD CVE-2026-77384
- Maintainer advisory GHSA-x787-gh7p-hmq7
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of libp2p/js-libp2p published their own advisory on GitHub. Reviewed sources take precedence over it.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.