Is CVE-2026-3503 in the CISA KEV catalog?

No. CVE-2026-3503 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-3503?

CVE-2026-3503 has a CVSS v3 base score of 5.2 (Moderate).

What is the EPSS score for CVE-2026-3503?

CVE-2026-3503 has an EPSS score of 0.15% (5th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-3503?

Upgrade wolfssl on debian unstable to 5.9.0-0.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-3503

MEDIUM

5.2

CVSS v3

NVD

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.

CWE-335

How to fix

Remediation Available

wolfsslDebian

Fixed in:5.9.0-0.1CVE-2026-3503

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorPhysical

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

Exploit Intelligence

0.15%probability of exploitation in 30 days

5thpercentile

Low risk: more likely to be exploited than 5% of all known CVEs.

References

Patch1

github.com

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-29.