CVE-2021-45693
Use of Uninitialized Resource in messagepack-rs.
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
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 messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
- Record
CVE-2021-45693- 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-908
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
- Record
CVE-2021-45693- Updated
- 2026-11-02
EUVDEUVD-2022-0631 No score
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
- Record
EUVD-2022-0631- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-jqjj-r4qp-x2gh
Use of Uninitialized Resource in messagepack-rs.
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
- Record
GHSA-jqjj-r4qp-x2gh- 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-908
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-m325-rxjv-pwph No score
Deserialization functions pass uninitialized memory to user-provided Read
Affected versions of this crate passed an uninitialized buffer to a
user-provided Read instance in:
deserialize_binarydeserialize_stringdeserialize_extension_othersdeserialize_string_primitive
This can result in safe Read implementations reading from the uninitialized
buffer leading to undefined behavior.
- Record
GHSA-m325-rxjv-pwph- Updated
- 2026-11-02
OSVGHSA-hr52-f9vp-582c
Use of Uninitialized Resource in messagepack-rs.
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_extension_others may read from uninitialized memory locations.
- Record
GHSA-hr52-f9vp-582c- 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-908
- Updated
- 2026-11-02
Show 5 moreShow less
OSVGHSA-jqjj-r4qp-x2gh
Use of Uninitialized Resource in messagepack-rs.
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string_primitive may read from uninitialized memory locations.
- Record
GHSA-jqjj-r4qp-x2gh- 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-908
- Updated
- 2026-11-02
OSVGHSA-jwfh-j623-m97h
Use of Uninitialized Resource in messagepack-rs
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_string may read from uninitialized memory locations.
- Record
GHSA-jwfh-j623-m97h- 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-908
- Updated
- 2026-11-02
OSVGHSA-vw5m-qw2r-m923
Use of Uninitialized Resource in messagepack-rs.
An issue was discovered in the messagepack-rs crate through 2021-01-26 for Rust. deserialize_binary may read from uninitialized memory locations.
- Record
GHSA-vw5m-qw2r-m923- 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-908
- Updated
- 2026-11-02
OSVGHSA-m325-rxjv-pwph No score
Deserialization functions pass uninitialized memory to user-provided Read
Affected versions of this crate passed an uninitialized buffer to a
user-provided Read instance in:
deserialize_binarydeserialize_stringdeserialize_extension_othersdeserialize_string_primitive
This can result in safe Read implementations reading from the uninitialized
buffer leading to undefined behavior.
- Record
GHSA-m325-rxjv-pwph- Updated
- 2026-11-02
OSVRUSTSEC-2021-0092 No score
Deserialization functions pass uninitialized memory to user-provided Read
Affected versions of this crate passed an uninitialized buffer to a
user-provided Read instance in:
deserialize_binarydeserialize_stringdeserialize_extension_othersdeserialize_string_primitive
This can result in safe Read implementations reading from the uninitialized
buffer leading to undefined behavior.
- Record
RUSTSEC-2021-0092- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
messagepack-rscrates.io |
through 0.8.1 | None known |
messagepack-rscrates.io From an advisory covering 4 CVEs |
through 0.8.1 | None known |
messagepack-rscrates.io From an advisory covering 4 CVEs |
0.0.0-0 and later | None known |
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-2021-45693 is a critical vulnerability (CVSS 9.8) in Messagepack-rs Project Messagepack-rs, published January 26, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.23%, the 69th percentile. No source names a fixed version.
References
rustsec.org/advisories/RUSTSEC-2021-0092.html
raw.githubusercontent.com/rustsec/advisory-db/main/crates/messagepack-rs/RUSTSEC-2021-0092.md
nvd.nist.gov/vuln/detail/CVE-2021-45693
github.com/otake84/messagepack-rs/issues/2