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MEDIUM severity

Databento Binary Encoding (DBN) has a heap buffer overflow using c_chars_to_str functionGHSA-pfr9-2p92-qrhq

MEDIUMFix: databento/dbn@339efb9

GHSA-pfr9-2p92-qrhq is a medium-severity (CVSS 5.5) remote code execution vulnerability in dbn. A fix is available for dbn — see the affected versions and patch details below.

Also known asRUSTSEC-2024-0377
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of May 20, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected
🦀dbn

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects crates.io packages — download data is not available via public APIs for these ecosystems.

Description

The heap-buffer-overflow is triggered in the strlen() function when handling the c_chars_to_str function in the dbn crate. This vulnerability occurs because the CStr::from_ptr() function in Rust assumes that the provided C string is null-terminated. However, there is no guarantee that the input chars array passed to the c_chars_to_str function is properly null-terminated.

If the chars array does not contain a null byte (\0), strlen() will continue to read beyond the bounds of the buffer in search of a null terminator. This results in an out-of-bounds memory read and can lead to a heap-buffer-overflow, potentially causing memory corruption or exposing sensitive information.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🦀crates.iodbnall versions0.22.1cargo update -p dbn --precise 0.22.1

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for dbn, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update dbn to 0.22.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-pfr9-2p92-qrhq is resolved across your whole dependency graph.

  3. Workarounds

    Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable.

Frequently Asked Questions

The `heap-buffer-overflow` is triggered in the `strlen()` function when handling the `c_chars_to_str` function in the dbn crate. This vulnerability occurs because the `CStr::from_ptr()` function in Rust assumes that the provided C string is null-terminated. However, there is no guarantee that the input chars array passed to the c_chars_to_str function is properly null-terminated. If the chars array does not contain a null byte (\0), strlen() will continue to read beyond the bounds of the buffer in search of a null terminator. This results in an out-of-bounds memory read and can lead to a heap
O3 Security · Impact-Aware SCA

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Databento Binary Encoding (DBN) has a heap buffer…