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CVE-2026-34219

30
FAUCET Score

CVE-2026-34219 details a remotely reachable panic vulnerability in the libp2p-rust Gossipsub implementation, affecting versions prior to 0.49.4. An attacker can trigger a denial of service by sending a crafted PRUNE control message with a specific backoff value, causing an Instant overflow during heartbeat processing. This high-severity vulnerability (CVSS 8.2) is easily exploitable over the network without authentication, leading to a system panic. Currently, there is no evidence of active exploitation or public exploit code, though the issue has received minimal community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.49.4CPE matchmatch criteria
cpe:2.3:a:protocol:libp2p-gossipsub:*:*:*:*:*:rust:*:*

CVSS Data

CVSS version used by this source: 4.0

8.2HIGH

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
VS Confidentiality
NONE
VS Integrity
NONE
VS Availability
HIGH
SS Confidentiality
NONE
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
0.40%
Probability of exploitation in next 30 days
EPSS Percentile
32.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0040 is in the 4th percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

rustpatch availablevia ghsa
Product: libp2p-gossipsubFixed in: 0.49.4
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

rustGHSA-xqmp-fxgv-xvq5high

libp2p-gossipsub: Remote crash via unchecked Instant overflow in heartbeat backoff expiry handling

Mar 30, 2026

References

github.com / libp2p/rust-libp2p/security/advisories/GHSA-xqmp-fxgv-xvq5
ExploitVendor Advisory