CVE-2024-27932Public exploitNetwork attack vector

Authentication-token disclosure via boundary-free hostname suffix matching

Published Mar 6, 2024 · Updated Aug 5, 2024

Improper input validation in Deno 1.8.0 through 1.40.3 allows remote attackers to obtain authentication tokens via crafted import hosts. AuthTokens::get in cli/auth_tokens.rs uses ends_with without requiring a preceding label boundary, so an unrelated hostname ending in the token domain receives DENO_AUTH_TOKENS credentials. Exploitation requires a configured token and execution of potentially untrusted imports, exposing only tokens matched by the crafted hostname.

CVSS severity4.6
Medium
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Deno 1.8.0 through 1.40.3 allows remote attackers to obtain authentication tokens via crafted import hosts. AuthTokens::get in cli/auth_tokens.rs uses ends_with without requiring a preceding label boundary, so an unrelated hostname ending in the token domain receives DENO_AUTH_TOKENS credentials. Exploitation requires a configured token and execution of potentially untrusted imports, exposing only tokens matched by the crafted hostname.

The record

CVE
CVE-2024-27932
Published
Mar 6, 2024
Updated
Aug 5, 2024
Vendor
Deno Land Inc.
Product
Deno
Classifications
CWE-20, T1041
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 1.8.0, < 1.40.4
  2. Affected versionversion=1.8.0 <1.40.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Deno Land Inc. · Denoversion=>= 1.8.0, < 1.40.4; version=1.8.0 <1.40.4

Published CVSS scores

4.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1041Exfiltration Over C2 Channel

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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