CVE-2021-30456
Double-free in id-map
An issue was discovered in the id-map crate through 2021-02-26 for Rust. A double free can occur in get_or_insert upon a panic of a user-provided f function.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in the id-map crate through 2021-02-26 for Rust. A double free can occur in get_or_insert upon a panic of a user-provided f function.
- Record
CVE-2021-30456- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-415
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the id-map crate through 2021-02-26 for Rust. A double free can occur in get_or_insert upon a panic of a user-provided f function.
- Record
CVE-2021-30456- Updated
- 2026-11-02
EUVDEUVD-2021-1891 No score
An issue was discovered in the id-map crate through 2021-02-26 for Rust. A double free can occur in get_or_insert upon a panic of a user-provided f function.
- Record
EUVD-2021-1891- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-vfqx-hv88-f9cv
Double-free in id-map
A double free can occur in get_or_insert upon a panic of a user-provided f function. get_or_insert reserves space for a value, before calling the user provided insertion function f. If the function f panics then uninitialized or previously freed memory can be dropped.
- Record
GHSA-vfqx-hv88-f9cv- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVGHSA-8gmx-cpcg-f8h5
Double-free in id-map
The clone_from implementation for IdMap drops the values present in the map and then begins cloning values from the other map. If a .clone() call pancics, then the afformentioned dropped elements can be freed again. get_or_insert
get_or_insert reserves space for a value, before calling the user provided insertion function f. If the function f panics then uninitialized or previously freed memory can be dropped. remove_set
When removing a set of elements, ptr::drop_in_place is called on each of the element to be removed. If the Drop impl of one of these elements panics then the previously dropped elements can be dropped again.
- Record
GHSA-8gmx-cpcg-f8h5- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVGHSA-rccq-j2m7-8fwr
Double-free in id-map
A double free can occur in remove_set upon a panic in a Drop impl. When removing a set of elements, ptr::drop_in_place is called on each of the element to be removed. If the Drop impl of one of these elements panics then the previously dropped elements can be dropped again.
- Record
GHSA-rccq-j2m7-8fwr- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVGHSA-vfqx-hv88-f9cv
Double-free in id-map
A double free can occur in get_or_insert upon a panic of a user-provided f function. get_or_insert reserves space for a value, before calling the user provided insertion function f. If the function f panics then uninitialized or previously freed memory can be dropped.
- Record
GHSA-vfqx-hv88-f9cv- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-415
- Updated
- 2026-11-02
OSVRUSTSEC-2021-0052 No score
Multiple functions can cause double-frees
The following functions in the crate are affected:
IdMap::clone_from
The clone_from implementation for IdMap drops the values present in the
map and then begins cloning values from the other map. If a .clone() call
pancics, then the afformentioned dropped elements can be freed again.
get_or_insert
get_or_insert reserves space for a value, before calling the user provided
insertion function f. If the function f panics then uninitialized or
previously freed memory can be dropped.
remove_set
When removing a set of elements, ptr::drop_in_place is called on each of the
element to be removed. If the Drop impl of one of these elements panics then
the previously dropped elements can be dropped again.
- Record
RUSTSEC-2021-0052- Updated
- 2026-11-02
Affected products
Affected packages
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-30456 is a critical vulnerability (CVSS 9.8) in Id-map Project Id-map, published February 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.14%, the 66th percentile. No source names a fixed version.