How severe is CVE-2024-27935?

CVE-2024-27935 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.

Is CVE-2024-27935 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2024-27935?

CVE-2024-27935 affects Deno. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2024-27935?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2024-27935 have an EU (EUVD) identifier?

Yes. CVE-2024-27935 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1029.

When was CVE-2024-27935 published?

CVE-2024-27935 was published on 2024-03-21 and last updated on 2026-06-17.

CVE-2024-27935

CVE-2024-27935 is a high-severity vulnerability in Deno with a CVSS 3.x base score of 7.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-488.

Key facts

Severity: High (CVSS 3.x base score 7.2)
EPSS exploit prediction: 1% (50th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2024-1029
Weakness: CWE-488
Affected product: Deno
Published: 2024-03-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2024-27935?: 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.
How severe is CVE-2024-27935?: CVE-2024-27935 has a CVSS 3.x base score of 7.2, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability low.
Is CVE-2024-27935 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (50th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2024-27935?: CVE-2024-27935 affects Deno. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2024-27935?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2024-27935 have an EU (EUVD) identifier?: Yes. CVE-2024-27935 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-1029.
When was CVE-2024-27935 published?: CVE-2024-27935 was published on 2024-03-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:deno:deno:*:*:*:*:*:*:*:*

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