# CVE-2026-68510: bit-vec: unsoundness arising with `deserialize` then `get_unchecked`

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

bit-vec is a compact vector of bits. Prior to version 0.10.0, there is undefined behavior if a user performs deserialize from an untrusted source and unsafe get_unchecked. A user of this library may be impacted by incorrect behavior if they perform deserialize from an untrusted source and run operations on the deserialized BitVec. This issue has been patched in version 0.10.0.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- contain-rs / bit-vec: < 0.10.0 (affected). Source: CNA: GitHub_M

## Severity and prioritization

- CVSS 4.0: 6.9 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-20

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/contain-rs/bit-vec/security/advisories/GHSA-h4f4-f333-vh4h (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/contain-rs/bit-vec/pull/149 (CNA: GitHub_M; x_refsource_MISC)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-68510; retrieved 2026-11-13; source updated 2026-11-13

Revision: 4fa61de02eacf100121e90eea0c2b22bb3278d1cdeff8946d22f1c6011dd58e6

Canonical: https://y2.dev/cve/CVE-2026-68510

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