CVE-2019-16143 json
Algorithms compute incorrect results in blake2
published 2019-08-25 7 y ago modified 2026-06-17 4 mo ago also GHSA-4x25-pvhw-5224 , RUSTSEC-2019-0019 , EUVD-2021-1566
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 60%
- public exploits
- 0
- none known
Summary
An issue was discovered in the blake2 crate before 0.8.1 for Rust. The BLAKE2b and BLAKE2s algorithms, when used with HMAC, produce incorrect results because the block sizes are half of the required sizes.
Patch / fix
- crates.io blake2 0.8.1
- blake2 blake2-rust 0.8.1
Exploit prediction
0.93% chance of exploitation in the next 30 days, higher than 60% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | blake2 | <0.8.1 >=0.0.0-0, <0.8.1 |
0.8.1 |
Classification
- Weakness
-
- CWE-327 Use of a Broken or Risky Cryptographic Algorithm
References
-
rustsec.org
/advisories/RUSTSEC-2019-0019.html
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2019-16143
advisory
-
github.com
/RustCrypto/MACs/issues/19
web, report
-
github.com
/RustCrypto/hashes/tree/master/blake2
package
-
crates.io
/crates/blake2
package
Sources
- CVE List CVE-2019-16143
- GitHub Advisory GHSA-4x25-pvhw-5224
- NVD CVE-2019-16143
- OSV RUSTSEC-2019-0019
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.