CVE-2026-3449Public exploit

Application task hangs via unsettled aborted Promises

Published Mar 3, 2026 · Updated Mar 3, 2026

Incorrect control-flow scoping in @tootallnate/once before 2.0.1 and 3.0.0 allows local users to hang application tasks. Within once(), the abort listener calls cleanup(), which removes event listeners but neither resolves nor rejects the returned Promise. Reachability requires an application path that supplies AbortSignal to once(); aborting it can stall requests or block workers without disclosing or altering data.

CVSS severity4.8
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect control-flow scoping in @tootallnate/once before 2.0.1 and 3.0.0 allows local users to hang application tasks. Within once(), the abort listener calls cleanup(), which removes event listeners but neither resolves nor rejects the returned Promise. Reachability requires an application path that supplies AbortSignal to once(); aborting it can stall requests or block workers without disclosing or altering data.

The record

CVE
CVE-2026-3449
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
TooTallNate
Product
@tootallnate/once
Classifications
CWE-705
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 2026Record 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=0 <3.0.1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

TooTallNate · @tootallnate/onceversion=0 <3.0.1

Published CVSS scores

1.9SnykCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
3.3SnykCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.8SnykCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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.

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No observations available

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

Weakness, pattern, technique

CWE-705Incorrect Control Flow Scoping

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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