CVE-2026-25800 — Quinn: Remote memory exhaustion in quinn-proto —...

HIGH

Quinn: Remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly

Published July 24, 2026Updated September 10, 2026Source: osv

Summary

## Summary 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.

Advisory Timeline

First published July 24, 2026 (80 days ago).
Last revised September 10, 2026 — 48 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Cargo

Update quinn-proto to 0.11.15 or later

cargo update -p quinn-proto --precise 0.11.15

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: crates.io (1).

Package	Ecosystem	Affected	Fixed In
quinn-proto	crates.io	All versions	0.11.15

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-770
Allocation of Resources Without LimitsMITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 7.5 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Frequently Asked Questions

What is CVE-2026-25800?: Quinn: Remote memory exhaustion in quinn-proto from unbounded out-of-order stream reassembly This vulnerability has been assigned a severity rating of HIGH (CVSS score: 7.5/10).
How do I check if my project is affected by CVE-2026-25800?: CVE-2026-25800 affects quinn-proto. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-25800 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

7.5

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-4w2j-m93h-cj5j

RUSTSEC-2026-0185

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