CVE-2026-3503

MEDIUM

5.2

CVSS v3

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

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

Related Vulnerabilities

Other CWE-335 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-14647	High	7.5	11%	-	Fix
CVE-2018-12520	High	8.1	11%	-	Fix
CVE-2016-10180	High	7.5	4.4%	-	-
CVE-2021-27211	High	7.5	3.3%	-	-
CVE-2021-41117	High	8.7	3.1%	-	Fix
CVE-2017-11519	Critical	9.8	3.1%	-	-

Common questions

How do I fix CVE-2026-3503?

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

Is CVE-2026-3503 being actively exploited?

Not that we know of. CVE-2026-3503 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.15% is the estimated probability that it will be exploited in the next 30 days. That is higher than 5% of all scored CVEs.

How severe is CVE-2026-3503?

CVE-2026-3503 has a CVSS v3 base score of 5.2, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-3503 affect?

Published advisories record a fix for wolfssl (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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.