CVE-2021-45696 json
Incorrect hash in sha2
published 2021-09-08 5 y ago modified 2026-06-17 4 mo ago also GHSA-fc7x-2cmc-8j2g , GHSA-xpww-g9jx-hp8r , RUSTSEC-2021-0100 , EUVD-2022-0580
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.8%
- EPSS 0.8% chance of exploitation in 30 days, percentile 57%
- public exploits
- 0
- none known
Summary
An issue was discovered in the sha2 crate 0.9.7 before 0.9.8 for Rust. Hashes of long messages may be incorrect when the AVX2-accelerated backend is used.
Patch / fix
Exploit prediction
0.83% chance of exploitation in the next 30 days, higher than 57% 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 |
| 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 | sha2 | >=0.9.7, <0.9.8 |
0.9.8 |
Classification
- Weakness
-
- CWE-327 Use of a Broken or Risky Cryptographic Algorithm
References
-
github.com
/RustCrypto/hashes/pull/314
web
-
rustsec.org
/advisories/RUSTSEC-2021-0100.html
web, third-party-advisory, advisory
-
raw.githubusercontent.com
/rustsec/advisory-db/main/crates/sha2/RUSTSEC-2021-0100.md
web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-45696
advisory
-
github.com
/RustCrypto/hashes
package
-
crates.io
/crates/sha2
package
Sources
- CVE List CVE-2021-45696
- GitHub Advisory GHSA-fc7x-2cmc-8j2g
- GitHub Advisory GHSA-xpww-g9jx-hp8r
- NVD CVE-2021-45696
- OSV RUSTSEC-2021-0100
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.