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Vulnerabilities

Vulnerability · RUSTSEC-2026-0341

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

Published Aug 17, 2026 · RustSec Rust

Open the advisory

Exploitation likelihood is not on this record for RUSTSEC-2026-0341. 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

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

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

How to fix RUSTSEC-2026-0341

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-2026-0341. 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. 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

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.