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DenoApplication

CVE-2024-27935

HIGH · 8.3 CVSS v3.1 Published 2024-03-21
Fix available
A fix is available. Upgrade to 1.36.3 or later.
See remediation →
92/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
Deno is a JavaScript, TypeScript, and WebAssembly runtime. Starting in version 1.35.1 and prior to version 1.36.3, a vulnerability in Deno's Node.js compatibility runtime allows for cross-session data contamination during simultaneous asynchronous reads from Node.js streams sourced from sockets or files. The issue arises from the re-use of a global buffer (BUF) in stream_wrap.ts used as a performance optimization to limit allocations during these asynchronous read operations. This can lead to data intended for one session being received by another session, potentially resulting in data corruption and unexpected behavior. This affects all users of Deno that use the node.js compatibility layer for network communication or other streams, including packages that may require node.js libraries indirectly. Version 1.36.3 contains a patch for this issue.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
DenoApplication
Affected:>= 1.35.1, < 1.36.3

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 1.36.3 or later
Fixed in 1.36.3
Vendor patch github.com →
Recommended fix High confidence

Deno 1.36.3 or later

  1. 1. Check the current Deno version by running: deno --version
  2. 2. If the version is >=1.35.1 and <1.36.3, upgrade to version 1.36.3 or later
  3. 3. On Linux/macOS, run: curl -fsSL https://deno.land/install.sh | sh -s v1.36.3
  4. 4. Or use the Deno version manager (dvm) if installed: dvm install 1.36.3
  5. 5. On Windows, run: irm https://deno.land/install.ps1 | iex
  6. 6. Verify the upgrade was successful by running: deno --version
  7. 7. Ensure the version now shows 1.36.3 or higher (e.g., 1.37.0, 1.38.0, etc.)
Caveat Minor version upgrades in Deno may include breaking changes; review the Deno release notes for any deprecation warnings or behavioral changes relevant to your application

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,950. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2024-27935 in production — separate from our analysis above.

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What this is

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  • Version or environment caveats, and links to real fixes
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