TI-2017-13058 Aliases CVE-2017-17821 GHSA-353g-x49j-hjg7

WTF/wtf/FastBitVector.h in WebKit, as distributed in Safari Technology Preview Release…

MEDIUM 45CWE-119Published 2017-12-21 · Updated 2024-08-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.01379 72nd percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:apple:safari:46::::technology_preview:::	46	Vulnerable	Apple

cpe:2.3:a:apple:safari:46:*:*:*:technology_preview:*:*:* Versions 46 Vulnerable ·Apple

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2017-17821
2026-10-03 Alias added: GHSA-353g-x49j-hjg7

References

Advisory 1

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

Other 1

https://bugs.webkit.org/show_bug.cgi?id=181020

TI-2025-17951 Out-of-bounds write in Apple Safari KEVCVSS 3.1CRITICAL 10.0
TI-2025-28228 Use after free in Apple Safari KEVCVSS 3.1HIGH 8.8
TI-2025-22512 Memory corruption in Apple Safari KEVCVSS 3.1HIGH 8.8
TI-2025-12953 Memory corruption in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2025-05957 Improper input validation in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2024-29863 Apple Safari: Processing maliciously crafted web content may lead to arbitrary code… KEVCVSS 3.1HIGH 8.8

See all 1693 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences