CVE-2026-106070
A flaw in the Node.js `zlib.ZipFile` API can cause it to return bytes that do not belong to the…
- Risk score
- 42/100
- CVSS
- 3.7 v3.0
- Exploit chance (30 days)
- 0.3%
- Published
- 21 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- A flaw in the Node.js zlib.ZipFile API can cause it to return bytes that do not belong to the requested entry after the local and central header validation fails. When zipEntry.modified is read on an archive whose local header does not match its central directory, either directly or while compacting the archive, the v…
- Affected
- Node.js
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Story map
At a glance
Node.js: Red, act today. A buffer overflow vulnerability in the Brotli decoder of Google Brotli versions 1.0.3 through 1.2.0 allows a remote unauthenticated attacker to potentially execute arbitrary code or cause a denial of service.
The flaws
- CVE-2026-106070: A flaw in the Node.js `zlib.ZipFile` API can cause it to return bytes that do not belong to the… (CVSS 3.7 · EPSS 0%)
- CVE-2026-111497: Out-of-bounds write can lead to remote code execution (CVSS 9.2 · EPSS 1%)
- CVE-2026-48930: Access control flaw (CVSS 9.8 · EPSS 0%)
- CVE-2026-48618: Authentication bypass (CVSS 6.5 · EPSS 3%)
The fix
Fix: Update to the latest available version: 1.0.10 or 1.1.1 or 1.2.1
Who is exposed: {'product': 'Google Brotli', 'packages': ['1.0.3', '1.0.4', '1.0.5', '1.0.6', '1.0.7', '1.0.8', '1.0.9', '1.0.10', '1.1.0', '1.1.1', '1.2.0', '1.2.1'], 'versions': ['1.0.3', '1.0.4', '1.0.5', '1.0.6', '1.0.7', '1.0.8', '1.0.9', '1.0.10', '1.1.0', '1.1.1', '1.2.0', '1.2.1']}
Where it stands
- Exploitation reported in the press
- 1 outlet covering it
How it unfolded
- 21 Oct, Node.js security releases (official): Wednesday, October 21, 2026 Security Releases
- 23 Oct, The Hacker News (press): Researchers Demonstrate Node2Shell RCE Exploit on Node.js Build Using Crafted Brotli Data
- 24 Oct, The Hacker News (press): Brotli Decoder Flaw Behind Node.js RCE Also Affects Bun, Python and Other Widely Used Software
Connects to
- Same weakness: CWE-840 (CWE-840). 2 other warnings in 30 days
- Same product: Earlier Node.js warnings. 11 in the last 90 days
Why it is Yellow
- CVSS 3.7 low
- On your watchlist: node.js
- Named in a government or vendor bulletin
Government and vendor bulletins
References
Original description
A flaw in the Node.js `zlib.ZipFile` API can cause it to return bytes that do not belong to the requested entry after the local and central header validation fails. When `zipEntry.modified` is read on an archive whose local header does not match its central directory, either directly or while compacting the archive, the validation error is caught but the parsed local header is left cached without a content offset. A later content read then returns attacker-controlled bytes from the start of the file instead of rejecting the archive, and CRC-32 verification still passes because the attacker controls the central directory CRC. A Node.js-based scanner can therefore approve different content from what another ZIP implementation extracts from the same archive. This vulnerability affects Node.js **26.x**.
Last activity 23 Oct 2026. Patch Forecast updates every hour.