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CVE-2026-34219— libp2p-gossipsub: Gossipsub PRUNE Backoff Heartbeat Instant Overflow

Quick assessment

Affected
libp2p rust-libp2p
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

rust-libp2p是libp2p开源的一种 libp2p 网络堆栈的 Rust 实现。 rust-libp2p 0.49.4之前版本存在安全漏洞，该漏洞源于处理特制PRUNE控制消息时未检查Instant和Duration的算术运算，可能导致远程内核崩溃。

AI Predicted 7.5 Difficulty: Easy EPSS 0.50% · P42

Possible ATT&CK Techniques 1 AI

T1133 · External Remote Services
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I. Basic Information for CVE-2026-34219

Vulnerability Information
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Vulnerability Title
libp2p-gossipsub: Gossipsub PRUNE Backoff Heartbeat Instant Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
libp2p-rust is the official rust language Implementation of the libp2p networking stack. Prior to version 0.49.4, the Rust libp2p Gossipsub implementation contains a remotely reachable panic in backoff expiry handling. After a peer sends a crafted PRUNE control message with an attacker-controlled, near-maximum backoff value, the value is accepted and stored as an Instant near the representable upper bound. On a later heartbeat, the implementation performs unchecked Instant + Duration arithmetic (backoff_time + slack), which can overflow and panic with: overflow when adding duration to instant. This issue is reachable from any Gossipsub peer over normal TCP + Noise + mplex/yamux connectivity and requires no further authentication beyond becoming a protocol peer. This issue has been patched in version 0.49.4.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
rust-libp2p 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
rust-libp2p是libp2p开源的一种 libp2p 网络堆栈的 Rust 实现。 rust-libp2p 0.49.4之前版本存在安全漏洞，该漏洞源于处理特制PRUNE控制消息时未检查Instant和Duration的算术运算，可能导致远程内核崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
libp2p rust-libp2p < 0.49.4 -

II. Public POCs for CVE-2026-34219

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III. Intelligence Information for CVE-2026-34219

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Vendor Advisories for CVE-2026-34219 (1)

IV. Related Vulnerabilities

Same product: rust-libp2p
Same vendor: libp2p
Same weakness: CWE-190

V. Comments for CVE-2026-34219

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