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Advisory record · RUSTSEC-2026-0365

Remote DoS through unchecked `IdList` allocation in negentropy

CVSS 7.5 High

Published by OSV at 14 Oct 2026, 12:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
negentropycrates.io>=0.2.0, <0.4.4 || >=0.5.0, <0.5.20.4.4, 0.5.2
Identifiers
RUSTSEC-2026-0365
Published
14 Oct 2026
Updated
16 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The negentropy crate on crates.io, versions 0.2.0 before 0.4.4 and 0.5.0 before 0.5.2, is vulnerable with the default std feature enabled. An unauthenticated remote attacker can send a small malformed reconciliation message that forces a huge memory allocation, aborting the application. Upgrade to negentropy 0.4.4 or 0.5.2. A message-size limit alone does not prevent this.

Written 3 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H OSV
  • CISA KEV Not listed.
  • EPSS No score.

Timeline

  1. 31 Oct 2026, 14:24 UTC First seen by agentprime
  2. 31 Oct 2026, 14:24 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.