CVE-2021-26308 json
Uninitialized buffer use in marc
published 2021-01-26 5 y ago modified 2026-06-17 4 mo ago also GHSA-3mf3-2gv9-h39j , RUSTSEC-2021-0014 , EUVD-2021-1549
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.5%
- EPSS 1.5% chance of exploitation in 30 days, percentile 74%
- public exploits
- 0
- none known
Summary
An issue was discovered in the marc crate before 2.0.0 for Rust. A user-provided Read implementation can gain access to the old contents of newly allocated memory, violating soundness.
Patch / fix
Exploit prediction
1.52% chance of exploitation in the next 30 days, higher than 74% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- rustsec.org https://rustsec.org/advisories/RUSTSEC-2021-0014.html referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | marc | <2.0.0 >=0.0.0-0, <2.0.0 |
2.0.0 |
Classification
- Weakness
-
- CWE-908 Use of Uninitialized Resource
References
-
github.com
/blackbeam/rust-marc/commit/6299af0
web
-
rustsec.org
/advisories/RUSTSEC-2021-0014.html
web, exploit, vendor-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-26308
advisory
-
github.com
/blackbeam/rust-marc/issues/7
web, report
-
github.com
/blackbeam/rust-marc
package
-
crates.io
/crates/marc
package
Sources
- CVE List CVE-2021-26308
- GitHub Advisory GHSA-3mf3-2gv9-h39j
- NVD CVE-2021-26308
- OSV RUSTSEC-2021-0014
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.