CVE-2026-21895

rsa crate has potential panic on a prime being equal to 1

CVE-2026-21895 is fixed in rust-rsa on 1 platform by DEBIAN-CVE-2026-21895 (version 0.9.10-1), released January 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.

Routine

CVSS

5.3

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0044

38th percentile

The `rsa` crate is an RSA implementation written in rust. Prior to version 0.9.10, when creating a RSA private key from its components, the construction panics instead of returning an error when one of the primes is `1`. Version 0.9.10 fixes the issue.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
rust-rsa · Debian 14	0.9.10-1	DEBIAN-CVE-2026-21895	Jan 8, 2026

Details

Published
January 8, 2026
Weakness
Improper Check or Handling of Exceptional Conditions
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21895

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