Rust advisories / bam
Vulnerability CriticalRUSTSEC-2021-0027 · bam
RUSTSEC-2021-0027: Loading a bgzip block can write out of bounds if size overflows.
Short answerA security vulnerability in the bam crate: Loading a bgzip block can write out of bounds if size overflows.. Critical severity (CVSS 9.8). Fixed in 0.1.3: update to a fixed version.
| Crate | bam |
|---|---|
| Type | Vulnerability (memory-corruption) |
| Affected versions | Before 0.1.3. |
| Fixed in | 0.1.3 |
| Severity | Critical, CVSS 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| Published | 2021-01-07 |
| Last changed | 2023-11-08 |
| Also known as | CVE-2021-28027, GHSA-cpqj-r29q-chrh |
| Affected functions | bam::bgzip::Block::load |
What to do
- See which version you have:
cargo tree -i bam(it also shows which of your dependencies pulls it in). - Update within your version requirement:
cargo update -p bam. If the fix is a newer major or minor than your requirement allows, raise it in Cargo.toml (for examplebam = "0.1.3") or update the dependency that pulls it in. - Check again with
cargo audit, or paste your Cargo.lock into our Cargo.toml checker.
Details from the advisory
Affected versions of bam set the length of an internal buffer using self.compressed.set_len(block_size - HEADER_SIZE - MIN_EXTRA_SIZE) and then wrote into it. While block_size was constrained to a proper maximum, when it was too small the subtraction could overflow negatively to a large number past the capacity of self.compressed.
This can result in memory corruption in the form of writing out of bounds when loading a bgzip file with a small block_size.
Commit 061eee38d4 fixed this issue by checking for the underflow when setting the buffer size.
References
- Package: crates.io/crates/bam
- Advisory: rustsec.org/advisories/RUSTSEC-2021-0027.html
- Report: gitlab.com/tprodanov/bam/-/issues/4
From the RustSec Advisory Database (CC0-1.0) via the OSV export, downloaded Oct 24, 2026. Severity score computed from the published CVSS vector.
Up next
Are you affected?Check your whole dependency treePaste Cargo.lock: every advisory, for your exact versions.Read it next →Also worth your time
Did this answer your question?