CVE-2016-9642: JavaScriptCore in WebKit allows attackers to cause a denial of service (out-of-bounds heap read) via a crafted

Routine

MEDIUM 5.5MITIGATE

CVE-2016-9642 is a medium-severity flaw (CVSS 5.5) affecting webkit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

JavaScriptCore in WebKit allows attackers to cause a denial of service (out-of-bounds heap read) via a crafted Javascript file.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.3% (top 30%)
CISA exploited list	No
Weakness	CWE-125
Published	2017-02-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: webkit

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

Am I affected?

Timeline

2017-02-03 15:59 UTCPublished CVE record published
2026-06-17 00:56 UTCUpdated Record last modified

webkit webkit MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy webkit || rpm -q webkit || webkit --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2016-9642?

webkit: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2016-9642 being exploited?

CVE-2016-9642 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-2016-9642 affect?

CVE-2016-9642 affects webkit. Severity is medium (CVSS 5.5). JavaScriptCore in WebKit allows attackers to cause a denial of service (out-of-bounds heap read) via a crafted Javascript file.

How urgent is CVE-2016-9642?

Priority 37/100. No elevated risk signals yet.

Software pages

WebKit vulnerabilities · Apple Safari and WebKit vulnerabilities

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References

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