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Not in CISA KEV
HIGH severity

Switcher Client contains Regular Expression Denial of Service (ReDoS)GHSA-wqxw-8h5g-hq56

HIGHFix: switcherapi/switcher-client-master@3747525

GHSA-wqxw-8h5g-hq56 is a high-severity (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in switcher-client. A fix is available for switcher-client — see the affected versions and patch details below.

Also known asCVE-2023-23925
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-wqxw-8h5g-hq56.

EPSS Exploitation Probability

via FIRST.org ↗
0.5%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs46th percentile — riskier than 46% of all scored CVEsHighest risk
0.00%0.35%0.69%1.04%0.4%0.5%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

0other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
switcher-clientnpm
495downloads / week

Description

Switcher Client is a JavaScript SDK to work with Switcher API which is cloud-based Feature Flag. Unsanitized input flows into Strategy match operation (EXIST), where it is used to build a regular expression. This may result in a Regular expression Denial of Service attack (reDOS). This issue has been patched in version 3.1.4. As a workaround, avoid using Strategy settings that use REGEX in conjunction with EXIST and NOT_EXIST operations.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmswitcher-clientall versions3.1.4npm install switcher-client@3.1.4

Affected Products

1 product · 1 configurations
Application
switcher clientswitcherapi
< 3.1.4
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for switcher-client, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update switcher-client to 3.1.4 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-wqxw-8h5g-hq56 is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

### Impact Unsanitized input flows into Strategy match operation (EXIST), where it is used to build a regular expression. This may result in a Regular expression Denial of Service attack (reDOS). ### Patches Patched in 3.1.4 ### Workarounds Avoid using Strategy settings that use REGEX in conjunction with EXIST and NOT_EXIST operations.
O3 Security · Impact-Aware SCA

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Switcher Client contains Regular Expression Denial of…