lib0 `readUint8Array` performs an unbounded read past the end of the decoder’s view, disclosing adjacent process memory

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-102360
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-29 14:17:20 UTC
Updated2026-09-30 19:38:27 UTC
DescriptionA missing bounds check in the binary decoder in lib0, versions 0.2.1-0.2.117 and earlier and 1.0.0-rc.32 and earlier, lets any unauthenticated remote peer read adjacent process memory and receive it back. `readUint8Array` never compares the wire-supplied length against the decoder's own view, so one over-long length prefix returns whatever the host process allocated next: other tenants' document content, personal data, and live bearer session tokens**, recovered in full and at will. An attacker who can supply bytes to a lib0 decoder which means any peer that can open a socket, including before authentication reads adjacent process memory and, where the consumer echoes, stores or re-serves the decoded value, receives it back. This is patched in version 0.2.118 and 1.0.0-rc.33.

Risk And Classification

Primary CVSS: v3.1 8.6 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Problem Types: CWE-125 | CWE-125 CWE-125: Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Dmonad Lib0 affected <= 0.2.1-0.2.117 Not specified
CNA Dmonad Lib0 affected <= 1.0.0-rc.32 Not specified

References

ReferenceSourceLinkTags
github.com/dmonad/lib0/security/advisories/GHSA-r5c8-rf4w-qrq8 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/dmonad/lib0/commit/c4c9db0b41346a33aff31a51f1f09c3a17757f10 [email protected] github.com
github.com/dmonad/lib0/commit/425f28dc82c8df1b6f7e1ab20ea1a0a15a3c355f [email protected] github.com
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