# RUSTSEC-2026-0343 - Outgoing datagram buffer accounting can panic the sender in quinn-proto

Source: https://junglewise.ai/threats/rustsec-2026-0343-outgoing-datagram-buffer-accounting-can-panic-the-270f6598  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-14  
License: CC BY 4.0 with a link back

Severity: low · CVSS 3.1 · Published 2026-09-14

Outgoing datagram buffer accounting can panic the sender in quinn-proto

Technologies: [quinn-proto (crates.io)](https://junglewise.ai/threats/technologies/crates-io-quinn-proto). Vendors: [crates.io](https://junglewise.ai/threats/vendors/crates-io).

## Quick answers

**Is This vulnerability exploited in the wild?** No. Junglewise Threat Intelligence has no report of This vulnerability being exploited in the wild.

**How severe is This vulnerability?** Low severity, with a CVSS score of 3.1, published 14 September 2026.

**Which products and versions are affected?** quinn-proto (crates.io) SEMVER:introduced=0.11.17,fixed=0.11.18.

**Is there a fix for This vulnerability?** Yes. quinn-proto (crates.io): upgrade to 0.11.18 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected?** Check whether you run quinn-proto (crates.io) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- quinn-proto (crates.io): upgrade to 0.11.18 or later

  ```sh
  cargo update -p quinn-proto
  ```


## Affected products

- quinn-proto (crates.io) SEMVER:introduced=0.11.17,fixed=0.11.18

## Identifiers

- GHSA-ppcp-v39w-8jq2
- RUSTSEC-2026-0343

## Related threats

- [RUSTSEC-2026-0340 - Peer minimum ACK delay can panic quinn-proto when ACK_FREQUENCY transmission is enabled](https://junglewise.ai/threats/rustsec-2026-0340-peer-minimum-ack-delay-can-panic-quinn-proto-when-ack-29882a7a)
- [quinn-proto denial of service in unordered stream reads](https://junglewise.ai/threats/rustsec-2026-0338-remote-peer-can-panic-quinn-proto-with-zero-length-c5ff03b1)
- [RUSTSEC-2026-0339 - Unbounded growth of pending connection ID retirements in quinn-proto](https://junglewise.ai/threats/rustsec-2026-0339-unbounded-growth-of-pending-connection-id-retirements-0568d867)
- [RUSTSEC-2026-0342 - Zero-length DATAGRAM frames bypass the receive buffer limit in quinn-proto](https://junglewise.ai/threats/rustsec-2026-0342-zero-length-datagram-frames-bypass-the-receive-buffer-613ca2dc)
- [RUSTSEC-2026-0341 - Stream reassembly memory-exhaustion guard in quinn-proto can be bypassed](https://junglewise.ai/threats/rustsec-2026-0341-stream-reassembly-memory-exhaustion-guard-in-quinn-f8cf793d)