Security Bulletin
Summary
HashiCorp memberlist before version 0.6.0 is vulnerable to a denial-of-service issue in its push/pull state handling that may allow an attacker with network access to the gossip port to exhaust memory on a receiving node and cause the process to terminate. This vulnerability (CVE-2026-14362) is fixed in memberlist 0.6.0.
Vulnerability Details
CVEID: CVE-2026-14362
DESCRIPTION: When a node received a push/pull state message, memberlist used the node count and user state length declared in the message header to pre-allocate memory before reading the remainder of the message, without validating those values against the actual message size or any upper bound. An attacker with network access to the gossip port could send a small, crafted message whose header declares very large values, causing the receiver to attempt an excessive memory allocation and be terminated, resulting in a denial of service. In clustered deployments, repeated requests could keep affected nodes unavailable. The affected path does not require authentication when gossip encryption is not enabled, which is the default configuration; clusters that enable gossip encryption require the shared key to communicate on the gossip port and are only exposed to authenticated exploitation of this issue.
CWE: CWE-770: Allocation of Resources Without Limits or Throttling
CVSS Source: HashiCorp Inc.
CVSS Base score: 4.9
CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)
Affected Products and Versions
| Affected Product(s) | Version(s) |
| Shared library Community Edition | affected from 0.1.5 up to 0.6.0 |
| Shared library Enterprise | N/A |
Remediation/Fixes
Customers should evaluate the risk associated with this issue and consider upgrading to memberlist 0.6.0, Consul 2.0.2, or Nomad 2.0.4. Customers who are unable to upgrade immediately can mitigate unauthenticated exploitation of this issue by enabling gossip encryption.
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References
Acknowledgement
This issue was reported to HashiCorp by Andy Gill of ZephrSec.
Change History
08 Jul 2026: Initial Publication
*The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin.
Disclaimer
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Document Location
Worldwide
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Document Information
Modified date:
08 July 2026
Initial Publish date:
08 July 2026
UID
ibm17279451