Reports
Weekly WebKit security reports. Filtered by LogicError.
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W32
7 picks from 384 commits 2026-08-08 – 14 6 security 1 dev v1.3.3
Sixteen storage handlers took an integer as proof you owned the file.; Another site's cache will happily serve back what you wrote into it.; A shadow-DOM cache that outlived the table it was stored inside.
AuthBypass2CrossOrigin2Race2TypeConfusion2+5 -
W29
5 picks from 468 commits 2026-07-18 – 24 4 security 1 dev v1.2.0
The hash check that ran before the script even existed.; A hot defineProperty fold kept a shape but dropped the check it was an object.; A recorded font stays safe on one thread — until a canvas hands it to two.
TypeConfusion2MemoryCorruption1LogicError1CrossOrigin1 -
W26
8 picks from 557 commits 2026-06-27 – 07-03 6 security 2 dev v1.7.0
Omit one argument and the promise-pair bindings hand you an exception cell.; A buffer you can free between assigning it and pressing play.; A compromised renderer names a file it can't read, and Safari hands it back.
UAF40Race20AuthBypass16LogicError15+55 -
W23
8 picks from 484 commits 2026-06-06 – 12 6 security 2 dev v1.3.3
Closing a page freed the <html> element out from under its own shadow trees.; A scope guard that pinned the string cell but not the bytes you were reading; Streams' pipeTo checked for a fake promise with a cast that never fails
UAF9OOB5Race5CrossOrigin4+13 -
W22
9 picks from 480 commits 2026-05-30 – 06-05 6 security 3 dev v1.3.3
The CORS policy took a detour through the process it was written to contain.; The eval cache kept a raw pointer that nothing was keeping alive.; The array that came back from an OSR exit disagreed with itself about its layout.
CrossOrigin6Other5UAF4LogicError3+10 -
W21
6 picks from 423 commits 2026-05-23 – 29 6 security v1.3.3
B3 was right that the value was dead — the collector agreed, and freed it.; The DFG certified a property absent from an object that owned it outright.; An IC exit undid a stack adjustment that had never happened.
UAF10OOB5AuthBypass5LogicError5+17 -
W20
16 picks from 423 commits 2026-05-16 – 22 6 security 10 dev v1.5.0
The collector was never told where the exit stub parked its pointers; Nine arguments, six registers, and zero bytes reserved for the overflow; A private field read that answers with the prototype's value
UAF4Other3LogicError2MemoryCorruption2+6 -
W18
15 picks 2026-05-02 – 08 5 security 10 dev v1.7.0
A stylesheet and one getComputedStyle() call read freed token storage.; The object-src spelling that looks like deny-all was the permissive one.; The GPU process let the renderer vote on which draft extensions it could use.
UAF2CrossOrigin1TypeConfusion1LogicError1