What’s Vulnerable › Vulnerabilities

CVE-2026-25800: quinn-proto has remote memory exhaustion from unbounded out-of-order stream reassembly

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-23 · updated 2026-10-24
• Weakness: CWE-770

Description

Quinn is a pure-Rust, async-compatible implementation of the IETF QUIC transport protocol. Starting in version 0.1.0 and prior to version 0.11.15, the `Assembler` component that assembles unordered stream fragments into consecutive chunks of the stream incurs some overhead for non-contiguous fragments. Readers that read from a `RecvStream` in order (through an `AsyncRead` impl for example) will be sensitive to peers that send fragments while leaving out early parts of the stream, and in particular, fragments with many gaps (because these cannot be defragmented). In such a scenario, the receiving connection suffers from high buffer overhead, enabling memory exhaustion. Version 0.11.15 fixes the issue.

Affected products

• quinn-rs quinn: from 0.1.0, < 0.11.15

References

• https://github.com/quinn-rs/quinn/pull/2694
• https://github.com/quinn-rs/quinn/security/advisories/GHSA-4w2j-m93h-cj5j
• https://rustsec.org/advisories/RUSTSEC-2026-0185.html

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