Out-of-Bounds Affecting webkit2gtk package, versions <2.22.0-2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-ECHOLATEST-WEBKIT2GTK-18016910
- published19 Jul 2026
- disclosed21 Dec 2017
Introduced: 21 Dec 2017
CVE-2017-17821 (opens in a new tab)How to fix?
Upgrade Echo:latest webkit2gtk to version 2.22.0-2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream webkit2gtk package and not the webkit2gtk package as distributed by Echo.
See How to fix? for Echo:latest relevant fixed versions and status.
WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release 46, allows remote attackers to cause a denial of service (buffer overflow) or possibly have unspecified other impact because it calls the FastBitVectorWordOwner::resizeSlow function (in WTF/wtf/FastBitVector.cpp) for a purpose other than initializing a bitvector size, and resizeSlow mishandles cases where the old array length is greater than the new array length.
References
- https://advisory.echohq.com/cve/CVE-2017-17821
- https://www.cve.org/CVERecord?id=CVE-2017-17821
- https://bugs.webkit.org/show_bug.cgi?id=181020
- https://github.com/dwfault/PoCs/blob/master/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF/WebKit%20Misuse%20of%20WTF:wtf:FastBitVector%20result%20in%20potential%20BOF.md