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Vulnerability · RUSTSEC-2026-0340

Peer minimum ACK delay can panic quinn-proto when ACK_FREQUENCY transmission is enabled

Published Sep 14, 2026 · RustSec Rust · evidence confidence high

When sending ACK_FREQUENCY frames is enabled through , the peer's transport parameters could cause to call with a minimum greater than its maximum, which panics. For example, a peer advertising a of 100,000 microseconds and a of 100 milliseconds passes transport parameter validation. At a 5 ms RTT, the lower bound of the clamp becomes 100 ms while the upper bound is 25 ms, violating the precondition of and panicking while driving the connection. Both automatically derived and explicitly configured maximum ACK delays use this calculation. Sending ACK_FREQUENCY frames is disabled by default, so

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-2026-0340 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. Sep 14, 2026 · RustSec Advisory DB

    Detected

    When sending ACK_FREQUENCY frames is enabled through , the peer's transport parameters could cause to call with a minimum greater than its maximum, which panics. For example, a peer advertising a of 100,000 microseconds and a of 100 milliseconds passes transport parameter validation. At a 5 ms RTT, the lower bound of the clamp becomes 100 ms while the upper bound is 25 ms, violating the preconditi

Sources

  • RustSec Advisory DBVendor advisoryRUSTSEC-2026-0340

    When sending ACK_FREQUENCY frames is enabled through , the peer's transport parameters could cause to call with a minimum greater than its maximum, which panics. For example, a peer advertising a of 100,000 microseconds and a of 100 milliseconds passes transport parameter validat

    crates.io