CVE-2026-2391Public exploitNetwork attack vector

Memory exhaustion via unchecked comma-split arrays

Published Feb 12, 2026 · Updated Feb 12, 2026

Improper input validation in qs 6.7.0 through 6.14.1 allows remote attackers to exhaust application memory through comma-separated query values. The parse logic splits comma-delimited strings into arrays before enforcing arrayLimit, so oversized arrays bypass the configured bound. Reachability requires a consuming application to parse attacker-controlled input with the non-default comma option enabled, resulting in service interruption from excessive allocation.

CVSS severity6.3
Medium
EPSS probability0.50%
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 qs 6.7.0 through 6.14.1 allows remote attackers to exhaust application memory through comma-separated query values. The parse logic splits comma-delimited strings into arrays before enforcing arrayLimit, so oversized arrays bypass the configured bound. Reachability requires a consuming application to parse attacker-controlled input with the non-default comma option enabled, resulting in service interruption from excessive allocation.

The record

CVE
CVE-2026-2391
Published
Feb 12, 2026
Updated
Feb 12, 2026
Vendor
ljharb
Product
qs
Classifications
CWE-20, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 12, 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=6.7.0 <=6.14.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ljharb · qsversion=6.7.0 <=6.14.1

Published CVSS scores

6.3harboristCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.7harboristCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
T1499.003Application Exhaustion Flood

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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