lib0 `readUint8Array` performs an unbounded read past the end of the decoder’s view, disclosing adjacent process memory (CVE-2026-102360) | HOL Guard CVE

High · CVSS 8.6CVE-2026-102360

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

Answer in brief

CVE-2026-102360 records a High severity (CVSS 8.6) vulnerability in lib0 `readUint8Array` performs an unbounded read past the end of the decoder’s view, disclosing adjacent process memory. The current sources do not mark it as known exploited. The current feed maps dmonad/lib0 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps dmonad/lib0 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
dmonad/lib0generic	<=0.2.1-0.2.117 \|\| <=1.0.0-rc.32	= 0.2.1-0.2.117, = 1.0.0-rc.32

Recommended response

Check inventory. Check lockfiles and deployed manifests for dmonad/lib0.
Review the reported fix. Update dmonad/lib0 to = 0.2.1-0.2.117 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

Upstream source description

A 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.

Quoted source text, attributed separately from HOL analysis.