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Findings

Vulnerability · RUSTSEC-2026-0341

Stream reassembly memory-exhaustion guard in quinn-proto can be bypassed

Published Aug 17, 2026 · RustSec Rust · evidence confidence high

The fix for RUSTSEC-2026-0185 in 0.11.15 added a cap on the number of chunks buffered by the that reassembles out-of-order stream data. However, the cap was only checked inside the branch that triggers defragmentation, which only runs when the estimated over-allocation exceeds a threshold proportional to the amount of buffered data. Frames handled entirely by the unordered-read deduplication loop returned before the check ran at all. A peer sending one small gapped STREAM frame per packet (for example, 6-byte frames separated by 1-byte gaps) keeps the per-chunk overhead below the defragmentati

Grounded briefings

Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.

Executive

RUSTSEC-2026-0341 is a unknown public vulnerability record for RustSec Rust. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.

System administrator

Identify whether RustSec Rust is in your estate, then compare installed versions with the affected ranges. Affected version ranges have not been ingested yet. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.

Security analyst

Signals on file: no CVSS/EPSS yet. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: rustsec. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.

Exploitation and remediation

  • Exploitation evidence

    Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.

  • Patch and remediation

    No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.

  • Safe detection guidance

    Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 17, 2026 · RustSec Advisory DB

    Detected

    The fix for RUSTSEC-2026-0185 in 0.11.15 added a cap on the number of chunks buffered by the that reassembles out-of-order stream data. However, the cap was only checked inside the branch that triggers defragmentation, which only runs when the estimated over-allocation exceeds a threshold proportional to the amount of buffered data. Frames handled entirely by the unordered-read deduplication loop

Sources

  • RustSec Advisory DBVendor advisoryRUSTSEC-2026-0341

    The fix for RUSTSEC-2026-0185 in 0.11.15 added a cap on the number of chunks buffered by the that reassembles out-of-order stream data. However, the cap was only checked inside the branch that triggers defragmentation, which only runs when the estimated over-allocation exceeds a

    crates.io