Vulnerability HighRUSTSEC-2026-0185 · quinn-proto
RUSTSEC-2026-0185: Remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly
Short answerA security vulnerability in the quinn-proto crate: Remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly. High severity (CVSS 7.5). Fixed in 0.11.15: update to a fixed version.
| Crate | quinn-proto |
|---|---|
| Type | Vulnerability (denial-of-service) |
| Affected versions | Before 0.11.15. |
| Fixed in | 0.11.15 |
| Severity | High, CVSS 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| Published | 2026-06-22 |
| Last changed | 2026-10-12 |
| Also known as | CVE-2026-25800, GHSA-4w2j-m93h-cj5j |
What to do
- See which version you have:
cargo tree -i quinn-proto(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p quinn-proto. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplequinn-proto = "0.11.15") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
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.
References
- Package: crates.io/crates/quinn-proto
- Advisory: rustsec.org/advisories/RUSTSEC-2026-0185.html
- Web: github.com/quinn-rs/quinn/pull/2694
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Other advisories for quinn-proto
- Vulnerability HighRUSTSEC-2023-0063 · 2023-09-21Denial of service in Quinn servers
- Vulnerability HighRUSTSEC-2024-0373 · 2024-09-02`Endpoint::retry()` calls can lead to panicking
- VulnerabilityRUSTSEC-2026-0037 · 2026-03-09Denial of service in Quinn endpoints
- VulnerabilityRUSTSEC-2026-0338 · 2026-09-14Remote peer can panic quinn-proto with zero-length STREAM frames during unordered reads
- VulnerabilityRUSTSEC-2026-0339 · 2026-08-17Unbounded growth of pending connection ID retirements in quinn-proto
- Vulnerability HighRUSTSEC-2026-0340 · 2026-09-14Peer minimum ACK delay can panic quinn-proto when ACK_FREQUENCY transmission is enabled
- Vulnerability HighRUSTSEC-2026-0341 · 2026-08-17Stream reassembly memory-exhaustion guard in quinn-proto can be bypassed
- VulnerabilityRUSTSEC-2026-0342 · 2026-08-17Zero-length DATAGRAM frames bypass the receive buffer limit in quinn-proto
Up next
Same cratequinn-proto: security historyEvery advisory for this crate, and whether it is safe to use today.Read it next →Did this answer your question?