CVE-2018-20991
Possible double free during unwinding in SmallVec::insert_many
Description
If an iterator passed to `SmallVec::insert_many` panicked in `Iterator::next`, destructors were run during unwinding while the vector was in an inconsistent state, possibly causing a double free (a destructor running on two copies of the same value). This is fixed in smallvec 0.6.3 by ensuring that the vector's length is not updated to include moved items until they have been removed from their original positions. Items may now be leaked if `Iterator::next` panics, but they will not be dropped more than once. Thank you to @Vurich for reporting this bug.
How to fix CVE-2018-20991
To remediate CVE-2018-20991, upgrade the affected package to a fixed version below.
- —upgrade to 0.6.3 or later
- —upgrade to 0.3.4 or later
Is CVE-2018-20991 being exploited?
Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- >= 0.3.2, < 0.6.3
- >= 0.3.2, < 0.3.4, >= 0.4.0-0, < 0.4.5, >= 0.5.0-0, < 0.5.1, >= 0.6.0-0, < 0.6.3
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |