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HIGH severity

CVE-2019-17598 — play-ws_2.12

HIGH

CVE-2019-17598 is a high-severity (CVSS 7.5) CWE-326 vulnerability in com.typesafe.play:play-ws_2.12. A fix is available for com.typesafe.play:play-ws_2.12 — see the affected versions and patch details below.

Play Framework Inadequate Encryption Strength vulnerability

Also known asGHSA-442g-gcg6-mhm4
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
0.7%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs53th percentile — riskier than 53% of all scored CVEsHighest risk
0.00%0.40%0.80%1.20%0.1%0.7%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
☕com.typesafe.play:play-ws_2.12

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in Lightbend Play Framework 2.5.x through 2.6.23. When configured to make requests using an authenticated HTTP proxy, play-ws may sometimes, typically under high load, when connecting to a target host using https, expose the proxy credentials to the target host.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavencom.typesafe.play:play-ws_2.12≥ 2.5.0&&< 2.6.242.6.24com.typesafe.play:play-ws_2.12:2.6.24

Affected Products

1 product · 2 configurations
Application
play frameworklightbend
≥ 2.6.0 && ≤ 2.6.23
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 com.typesafe.play:play-ws_2.12, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update com.typesafe.play:play-ws_2.12 to 2.6.24 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2019-17598 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

An issue was discovered in Lightbend Play Framework 2.5.x through 2.6.23. When configured to make requests using an authenticated HTTP proxy, play-ws may sometimes, typically under high load, when connecting to a target host using https, expose the proxy credentials to the target host.
O3 Security · Impact-Aware SCA

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CVE-2019-17598: play-ws_2.12 — Fixed in 2.6.24