CVE-2016-10544: uws is a WebSocket server library

Q: How do I fix CVE-2016-10544?

uws: upgrade to newer than 0.10.8. Exact commands for each OS are on this page.

Q: Is CVE-2016-10544 being exploited?

CVE-2016-10544 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2016-10544 affect?

CVE-2016-10544 affects uws. Severity is medium (CVSS 5.9). uws is a WebSocket server library. By sending a 256mb websocket message to a uws server instance with permessage-deflate enabled, there is a possibility used compression will shrink said 256mb down to less than 16mb of websocket payload whi

Q: How urgent is CVE-2016-10544?

Priority 43/100. Remotely exploitable, no login, no user action

This month

MEDIUM 5.9REMOTEUPGRADE

CVE-2016-10544 is a medium-severity flaw (CVSS 5.9) affecting uws. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

uws is a WebSocket server library. By sending a 256mb websocket message to a uws server instance with permessage-deflate enabled, there is a possibility used compression will shrink said 256mb down to less than 16mb of websocket payload which passes the length check of 16mb payload. This data will then inflate up to 256mb and crash the node process by exceeding V8's maximum string size. This affects uws >=0.10.0 <=0.10.8.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	1.3% (top 29%)
CISA exploited list	No
Weakness	CWE-400, CWE-20
Published	2018-05-31
Last modified	2026-06-17

Publisher (CNA): HackerOne · Vendor: uws project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2018-05-31 20:29 UTCPublished CVE record published
2026-06-17 00:39 UTCUpdated Record last modified

uws project uws UPGRADE

Affected: >= 0.10.0 and <= 0.10.8

Fixed in: newer than 0.10.8

Safe to downgrade to: a release before 0.10.0

1. Check installed version

npm ls uws

2. UPGRADE to newer than 0.10.8

npm install uws@">0.10.8"

3. If no update is available yet, DOWNGRADE to a release before 0.10.0

npm view uws versions npm install uws@"<0.10.0"

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-10544?

uws: upgrade to newer than 0.10.8. Exact commands for each OS are on this page.

Is CVE-2016-10544 being exploited?

CVE-2016-10544 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2016-10544 affect?

CVE-2016-10544 affects uws. Severity is medium (CVSS 5.9). uws is a WebSocket server library. By sending a 256mb websocket message to a uws server instance with permessage-deflate enabled, there is a possibility used compression will shrink said 256mb down to less than 16mb of websocket payload whi

How urgent is CVE-2016-10544?

Priority 43/100. Remotely exploitable, no login, no user action

References

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