CVE-2025-29606 py-libp2p is vulnerable to DoS attacks through use of large RSA keys
A remote peer can cause resource exhaustion and denial of service in py-libp2p by sending a large RSA key.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-29606?
CVE-2025-29606 is a medium-severity denial of service vulnerability in py-libp2p, published on 14 Jul 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
py-libp2p before 0.2.3 allows a peer to cause a denial of service (resource consumption) via a large RSA key.
Weakness: CWE-770
Which versions are affected by CVE-2025-29606?
3 open source packages ship an affected version, including libp2p.
| Package | Affected | Fixed in |
|---|---|---|
libp2p PyPI | All versions | 0.2.3 |
libp2p PyPI | All versions | 0.2.3 |
libp2p PyPI | All versions | 0.2.3 |
How do I fix CVE-2025-29606?
Upgrade libp2p to 0.2.3 or later.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-29606 being exploited?
There is no known exploitation of CVE-2025-29606 in the wild and no public exploit code.
Sources
Also known as GHSA-x8c6-gj59-6rx8, PYSEC-2026-1536.