How severe is CVE-2026-21895?

CVE-2026-21895 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2026-21895 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-21895?

CVE-2026-21895 affects Rustcrypto Rsa. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-21895?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-21895 have an EU (EUVD) identifier?

Yes. CVE-2026-21895 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1033.

When was CVE-2026-21895 published?

CVE-2026-21895 was published on 2026-01-08 and last updated on 2026-06-17.

CVE-2026-21895

CVE-2026-21895 is a medium-severity vulnerability in Rustcrypto Rsa with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-703.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v4: 2.7
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1033
Weakness: CWE-703
Affected product: Rustcrypto Rsa
Published: 2026-01-08
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-21895?: 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.
How severe is CVE-2026-21895?: CVE-2026-21895 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2026-21895 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-21895?: CVE-2026-21895 affects Rustcrypto Rsa. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-21895?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-21895 have an EU (EUVD) identifier?: Yes. CVE-2026-21895 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1033.
When was CVE-2026-21895 published?: CVE-2026-21895 was published on 2026-01-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rustcrypto:rsa:*:*:*:*:*:rust:*:*

More vulnerabilities in Rustcrypto Rsa

CVE-2023-49092 — Medium (CVSS 5.9): RustCrypto/RSA is a portable RSA implementation in pure Rust. Due to a non-constant-time implementation, information…

All CVEs affecting Rustcrypto Rsa →

Other CWE-703 vulnerabilities

CVE-2025-13026 — Critical (CVSS 9.8): Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in…
CVE-2025-13023 — Critical (CVSS 9.8): Sandbox escape due to incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in…
CVE-2025-13022 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and…
CVE-2025-13021 — Critical (CVSS 9.8): Incorrect boundary conditions in the Graphics: WebGPU component. This vulnerability was fixed in Firefox 145 and…
CVE-2024-39815 — Critical (CVSS 9.1): Improper check or handling of exceptional conditions vulnerability affecting Vonets industrial wifi bridge relays…
CVE-2023-45927 — Critical (CVSS 9.1): S-Lang 2.3.2 was discovered to contain an arithmetic exception via the function tt_sprintf().

Browse all CWE-703 vulnerabilities →