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Vulnerabilities

Vulnerability · CVE-2026-2391

### Summary The option in qs does not enforce limits for comma-separated values when is enabled, allowing attackers to cause denial-of-service via memory exhaustion.

Published Feb 12, 2026 · catalog updated Feb 12, 2026 · ### Summary The option

Last checked Nov 6, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-2391. EPSS is 0.54%. Act only if a listed version of ### Summary The option is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (### Summary The option).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Medium6.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.54%
Remediation
Advisory link
Affected products
vendor harborist

### Summary The option in qs does not enforce limits for comma-separated values when is enabled, allowing attackers to cause denial-of-service via memory exhaustion. This is a bypass of the array limit enforcement, similar to the bracket notation bypass addressed in GHSA-6rw7-vpxm-498p (CVE-2025-15284). ### Details When the option is set to (not the default, but configurable in applications), qs allows parsing comma-separated strings as arrays (e.g., becomes ). However, the limit check for (default: 20) and the optional throwOnLimitExceeded occur after the comma-handling logic in , enabling a

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor harboristversion unspecified

How to fix CVE-2026-2391

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-2391. EPSS is 0.54%. Act only if a listed version of ### Summary The option is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.54%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 12, 2026 · EUVD

    Detected

    ### Summary The option in qs does not enforce limits for comma-separated values when is enabled, allowing attackers to cause denial-of-service via memory exhaustion. This is a bypass of the array limit enforcement, similar to the bracket notation bypass addressed in GHSA-6rw7-vpxm-498p (CVE-2025-15284). ### Details When the option is set to (not the default, but configurable in applications), qs a

  2. Feb 12, 2026 · EUVD

    Updated

    ### Summary The option in qs does not enforce limits for comma-separated values when is enabled, allowing attackers to cause denial-of-service via memory exhaustion. This is a bypass of the array limit enforcement, similar to the bracket notation bypass addressed in GHSA-6rw7-vpxm-498p (CVE-2025-15284). ### Details When the option is set to (not the default, but configurable in applications), qs a

Sources

  • CVE.orgVulnerability recordCVE-2026-2391

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-2391

    30-day exploitation probability 0.54%

    first.org
  • EUVDVulnerability recordEUVD-2026-6720

    ### Summary The option in qs does not enforce limits for comma-separated values when is enabled, allowing attackers to cause denial-of-service via memory exhaustion. This is a bypass of the array limit enforcement, similar to the bracket notation bypass addressed in GHSA-6rw7-vpx

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 6, 2026
  • CVE.orgNov 4, 2026
  • EUVDNov 3, 2026