How severe is CVE-2026-35405?

CVE-2026-35405 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-35405 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35405?

CVE-2026-35405 affects Protocol Libp2p. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35405?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-35405 have an EU (EUVD) identifier?

Yes. CVE-2026-35405 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19649.

When was CVE-2026-35405 published?

CVE-2026-35405 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-35405

CVE-2026-35405 is a high-severity vulnerability in Protocol Libp2p with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19649
Weakness: CWE-770
Affected product: Protocol Libp2p
Published: 2026-04-07
Last modified: 2026-06-17

Description

libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, libp2p-rendezvous server has no limit on how many namespaces a single peer can register. A malicious peer can just keep registering unique namespaces in a loop and the server happily accepts every single one allocating memory for each registration with no pushback. Keep doing this long enough (or with multiple sybil peers) and the server process gets OOM killed. This vulnerability is fixed in 0.17.1.

Frequently asked questions

What is CVE-2026-35405?: libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, libp2p-rendezvous server has no limit on how many namespaces a single peer can register. A malicious peer can just keep registering unique namespaces in a loop and the server happily accepts every single one allocating memory for each registration with no pushback. Keep doing this long enough (or with multiple sybil peers) and the server process gets OOM killed. This vulnerability is fixed in 0.17.1.
How severe is CVE-2026-35405?: CVE-2026-35405 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-35405 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35405?: CVE-2026-35405 affects Protocol Libp2p. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35405?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-35405 have an EU (EUVD) identifier?: Yes. CVE-2026-35405 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19649.
When was CVE-2026-35405 published?: CVE-2026-35405 was published on 2026-04-07 and last updated on 2026-06-17.

References

https://github.com/libp2p/rust-libp2p/security/advisories/GHSA-cqfx-gf56-8x59

Affected products (1)

cpe:2.3:a:protocol:libp2p:*:*:*:*:*:rust:*:*

More vulnerabilities in Protocol Libp2p

CVE-2026-35457 — High (CVSS 8.2): libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to 0.17.1, the…
CVE-2023-40583 — High (CVSS 7.5): libp2p is a networking stack and library modularized out of The IPFS Project, and bundled separately for other tools to…
CVE-2022-23492 — High (CVSS 7.5): go-libp2p is the offical libp2p implementation in the Go programming language. Version `0.18.0` and older of go-libp2p…
CVE-2022-23487 — High (CVSS 7.5): js-libp2p is the official javascript Implementation of libp2p networking stack. Versions older than `v0.38.0` of…
CVE-2022-23486 — High (CVSS 7.5): libp2p-rust is the official rust language Implementation of the libp2p networking stack. In versions prior to 0.45.1 an…

All CVEs affecting Protocol Libp2p →

Other CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities

CVE-2026-31283 — Critical (CVSS 9.8): In Totara LMS v19.1.5 and before, the forgot password API does not implement rate limiting for the target email…
CVE-2020-37067 — Critical (CVSS 9.8): Filetto 1.0 FTP server contains a denial of service vulnerability in the FEAT command processing that allows attackers…
CVE-2021-47875 — Critical (CVSS 9.8): GeoGebra CAS Calculator 6.0.631.0 contains a denial of service vulnerability that allows attackers to crash the…
CVE-2025-11832 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling vulnerability in Azure Access Technology BLU-IC2, Azure Access…
CVE-2024-44241 — Critical (CVSS 9.8): The issue was addressed with improved bounds checks. This issue is fixed in iOS 18.1 and iPadOS 18.1, macOS Sequoia…
CVE-2022-3439 — Critical (CVSS 9.8): Allocation of Resources Without Limits or Throttling in GitHub repository ikus060/rdiffweb prior to 2.5.0.

Browse all CWE-770 (Allocation of Resources Without Limits or Throttling) vulnerabilities →