GHSA-v935-pqmr-g8v9

Unexpected panics in num-bigint

No scoreFix available

GHSA-v935-pqmr-g8v9 is a vulnerability with no CVSS score yet in num-bigint, published November 3, 2021. No source lists public exploit code. Fixed in num-bigint 0.4.3.

What does this mean?

Severity: UnratedNo CVSS score yet
Exploit chance: UnscoredNo EPSS score yet
Exploitation: None knownNot on CISA’s or ENISA’s lists
Fixed in: 0.4.3num-bigint

Description

Impact

Two scenarios were reported where BigInt and BigUint multiplication may unexpectedly panic.

The internal mac3 function did not expect the possibility of non-empty all-zero inputs, leading to an unwrap() panic.
A buffer was allocated with less capacity than needed for an intermediate result, leading to an assertion panic.

Rust panics can either cause stack unwinding or program abort, depending on the application configuration. In some settings, an unexpected panic may constitute a denial-of-service vulnerability.

Patches

Both problems were introduced in version 0.4.1, and are fixed in version 0.4.3.

For more information

If you have any questions or comments about this advisory, please open an issue in the num-bigint repo.

Acknowledgements

Thanks to Guido Vranken and Arvid Norberg for privately reporting these issues to the author.

References

Affected packages

Affected packages
Package	Affected	Fixed
`num-bigint` crates.io	0.4.1 up to 0.4.3	0.4.3

What each source reports

GitHub AdvisoriesNo score

Unexpected panics in num-bigint

Impact

Two scenarios were reported where BigInt and BigUint multiplication may unexpectedly panic.

The internal mac3 function did not expect the possibility of non-empty all-zero inputs, leading to an unwrap() panic.
A buffer was allocated with less capacity than needed for an intermediate result, leading to an assertion panic.

Rust panics can either cause stack unwinding or program abort, depending on the application configuration. In some settings, an unexpected panic may constitute a denial-of-service vulnerability.

Patches

Both problems were introduced in version 0.4.1, and are fixed in version 0.4.3.

For more information

If you have any questions or comments about this advisory, please open an issue in the num-bigint repo.

Acknowledgements

Thanks to Guido Vranken and Arvid Norberg for privately reporting these issues to the author.

References

Record: GHSA-v935-pqmr-g8v9
Weakness: CWE-20, CWE-131
Updated: 2026-11-02

OSVNo score

Unexpected panics in num-bigint

Impact

Two scenarios were reported where BigInt and BigUint multiplication may unexpectedly panic.

The internal mac3 function did not expect the possibility of non-empty all-zero inputs, leading to an unwrap() panic.
A buffer was allocated with less capacity than needed for an intermediate result, leading to an assertion panic.

Rust panics can either cause stack unwinding or program abort, depending on the application configuration. In some settings, an unexpected panic may constitute a denial-of-service vulnerability.

Patches

Both problems were introduced in version 0.4.1, and are fixed in version 0.4.3.

For more information

If you have any questions or comments about this advisory, please open an issue in the num-bigint repo.

Acknowledgements

Thanks to Guido Vranken and Arvid Norberg for privately reporting these issues to the author.

References

Record: GHSA-v935-pqmr-g8v9
Weakness: CWE-131, CWE-20
Updated: 2026-11-02

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	GitHub Advisories, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.