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Vulnerabilities

Vulnerability · RUSTSEC-2026-0340

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

Published Sep 14, 2026 · RustSec Rust

Open the advisory

Exploitation likelihood is not on this record for RUSTSEC-2026-0340. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Not established
Affected products
RustSec Rust

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

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix RUSTSEC-2026-0340

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for RUSTSEC-2026-0340. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

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

Freshness

Last verified in this catalog Unknown date. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.