How severe is CVE-2026-3503?

CVE-2026-3503 has a CVSS 3.x base score of 5.2, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.

Is CVE-2026-3503 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3503?

CVE-2026-3503 affects Wolfssl. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3503?

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

Does CVE-2026-3503 have an EU (EUVD) identifier?

Yes. CVE-2026-3503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13149.

When was CVE-2026-3503 published?

CVE-2026-3503 was published on 2026-03-19 and last updated on 2026-06-17.

CVE-2026-3503

CVE-2026-3503 is a medium-severity vulnerability in Wolfssl with a CVSS 3.x base score of 5.2. 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-335.

Key facts

Severity: Medium (CVSS 3.x base score 5.2)
CVSS v4: 4.3
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13149
Weakness: CWE-335
Affected product: Wolfssl
Published: 2026-03-19
Last modified: 2026-06-17

Description

Protection mechanism failure in wolfCrypt post-quantum implementations (ML-KEM and ML-DSA) in wolfSSL on ARM Cortex-M microcontrollers allows a physical attacker to compromise key material and/or cryptographic outcomes via induced transient faults that corrupt or redirect seed/pointer values during Keccak-based expansion. This issue affects wolfSSL (wolfCrypt): commit hash d86575c766e6e67ef93545fa69c04d6eb49400c6.

Frequently asked questions

What is CVE-2026-3503?: Protection mechanism failure in wolfCrypt post-quantum implementations (ML-KEM and ML-DSA) in wolfSSL on ARM Cortex-M microcontrollers allows a physical attacker to compromise key material and/or cryptographic outcomes via induced transient faults that corrupt or redirect seed/pointer values during Keccak-based expansion. This issue affects wolfSSL (wolfCrypt): commit hash d86575c766e6e67ef93545fa69c04d6eb49400c6.
How severe is CVE-2026-3503?: CVE-2026-3503 has a CVSS 3.x base score of 5.2, rated medium severity. It is exploitable over physical access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability none.
Is CVE-2026-3503 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3503?: CVE-2026-3503 affects Wolfssl. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3503?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-3503 have an EU (EUVD) identifier?: Yes. CVE-2026-3503 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13149.
When was CVE-2026-3503 published?: CVE-2026-3503 was published on 2026-03-19 and last updated on 2026-06-17.

References

https://github.com/wolfSSL/wolfssl/pull/9734

Affected products (1)

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

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