How severe is CVE-2026-3580?

CVE-2026-3580 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-3580 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3580?

CVE-2026-3580 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3580?

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

Does CVE-2026-3580 have an EU (EUVD) identifier?

Yes. CVE-2026-3580 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13172.

When was CVE-2026-3580 published?

CVE-2026-3580 was published on 2026-03-19 and last updated on 2026-06-17.

CVE-2026-3580

CVE-2026-3580 is a medium-severity vulnerability in Wolfssl with a CVSS 3.x base score of 4.7. 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-203.

Key facts

Severity: Medium (CVSS 3.x base score 4.7)
CVSS v4: 2.1
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13172
Weakness: CWE-203
Affected product: Wolfssl
Published: 2026-03-19
Last modified: 2026-06-17

Description

In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis.

Frequently asked questions

What is CVE-2026-3580?: In wolfSSL 5.8.4, constant-time masking logic in sp_256_get_entry_256_9 is optimized into conditional branches (bnez) by GCC when targeting RISC-V RV32I with -O3. This transformation breaks the side-channel resistance of ECC scalar multiplication, potentially allowing a local attacker to recover secret keys via timing analysis.
How severe is CVE-2026-3580?: CVE-2026-3580 has a CVSS 3.x base score of 4.7, rated medium severity. It is exploitable over local access with high attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-3580 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3580?: CVE-2026-3580 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3580?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3580 have an EU (EUVD) identifier?: Yes. CVE-2026-3580 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13172.
When was CVE-2026-3580 published?: CVE-2026-3580 was published on 2026-03-19 and last updated on 2026-06-17.

References

https://github.com/wolfSSL/wolfssl/pull/9855

Affected products (1)

cpe:2.3:a:wolfssl:wolfssl:5.8.4:*:*:*:*:*:*:*

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