What is CVE-2026-89172?

CVE-2026-89172 is Side-channel attack of AN1044/AN953/SW300052 cryptographic algorithms. The supplied enrichment data classifies it as Unclassified mapped to CWE-1300 CWE-1300.

Which versions are affected?

Affected product and version evidence is listed in the product table above. Current public advisories should be checked for exact version scope before patch targeting is finalized.

Is there active exploitation?

Active exploitation is not confirmed from current sources for CVE-2026-89172. If exploitation is not confirmed from current sources, teams should document that status and continue monitoring KEV, vendor, and telemetry updates.

No. CVE-2026-89172 is not listed in CISA KEV in the supplied enrichment data. KEV status should be monitored because it can change after initial disclosure or after exploitation becomes publicly confirmed.

Is there a public exploit?

A public PoC is not confirmed from current sources for CVE-2026-89172. Public exploit or PoC availability should raise triage priority, especially for exposed or business-critical systems.

How can defenders detect it?

Start with Not reported where available. Look for vulnerability-class behavior, product errors, suspicious authentication events, exploit probes, and abnormal process activity based only on evidence that applies to the affected product.

How should teams prioritize it?

Prioritize CVE-2026-89172 using CVSS 5.6, EPSS 0%, KEV status, public PoC status, and asset exposure. Internet-facing, privileged, or business-critical deployments should be handled first.

Are workarounds available?

Workarounds are not confirmed from current sources. Fixed-version evidence is listed in the mitigation section above.

Which threat actors are linked publicly?

No public threat actor linkage is confirmed from current sources. Do not attribute exploitation to a threat actor unless the source evidence explicitly supports that linkage.

What should be done in the next 24 hours?

Identify exposed assets running affected vendor/product/version combinations. Prioritize based on EPSS, PoC availability, and external exposure. Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class. Open remediation tickets with affected assets, owners, evidence status, and detection coverage so decisions are traceable.

medium

CVE-2026-89172

CVE-2026-89172 — Side-channel attack of AN1044/AN953/SW300052 cryptographic algorithms

Improper protection of physical side channels vulnerability in Microchip AN1044, Microchip AN953, and Microchip SW300052. This issue affects AN1044: through A; AN953: through A; SW300052: through 2.6.

Published Sep 12, 2026Updated Sep 12, 2026Sources: NVD, Microchip (CNA), GitHub, SOCRadar CTI

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the scoring sources call it.

Exploitation

Unreported

no source claims exploitation

EPSS

ahead of 0% of scored CVEs

Affects

Microchip

3 products listed

CVSS base

5.6

medium

Remediation

The vendor's own words where we have them.

None. Side-channel prevention is outside of intended use of product.

First 24 hours

Ordered from the record's own fields — exposure first, because you cannot patch what you have not found.

Identify exposed assets running affected vendor/product/version combinations.
Prioritize based on EPSS, PoC availability, and external exposure.
Search available logs for exploit probes, errors, authentication anomalies, or suspicious child processes matching the vulnerability class.

Affected scope

Vendor, product and version as the advisories word them.

Vendor	Product	Versions	Status
Microchip	AN1044	0	Vulnerable
Microchip	AN953	0	Vulnerable
Microchip	SW300052	0 to <= 2.6	Vulnerable

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack Complexity

High

Attack Vector

Physical

Privileges Req

None

User Interaction

None

Every base score collected

Sources score independently and disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Source
5.6	CVSS 4.0	medium	—	—	Microchip (CNA)

CVSS:4.0/AV:P/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N

What this weakness leads to

MITRE's own consequences and mitigations for the weakness class — the authority's wording, not guidance derived from the CVSS vector.

MITRE

CWE-1300 · Improper Protection of Physical Side Channels

Read Memory
Read Application Data::

Mitigation: Apply blinding or masking techniques to implementations of cryptographic algorithms.

Weakness & attack patterns

CWE-1300

Attack patterns reported against this CVE. The ATT&CK techniques below are inferred from its weakness class.

CAPEC-189 · Black Box Reverse Engineering

Timeline

What happened to this CVE, newest first — with the readings a source repeats on a schedule counted underneath rather than listed.

2026
Added · CVSS 3.1 5.6 (AV:P)
Sep 12, 2026 · NVD
Initial · CVE published
Sep 12, 2026 · NVD
CVE published by MITRE.
Sep 12, 2026 · SOCRadar CTI
Reported
Apr 1, 2026 · Microchip

References

4 on the record

www.microchip.com/en-us/application-notes/an1044
Vendor Advisory
www.microchip.com/en-us/application-notes/an953
Vendor Advisory
www.microchip.com/en-us/development-tool/sw300052
Vendor Advisory
www.microchip.com/en-us/solutions/technologies/embedded-security/how-to-report-potential-product-security-vulnerabilities/side-channel-attack-an1044-an953-sw300052-cryptographic-algorithms
Vendor Advisory

Elsewhere on this site

Microchipevery CVE for this vendor
Unclassifiedsame class
CWE-1300other pages naming this weakness

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record1

What should defenders know first?

CVE-2026-89172 is Side-channel attack of AN1044/AN953/SW300052 cryptographic algorithms, a medium vulnerability affecting AN1044, AN953, SW300052 from Microchip. The current evidence does not list it in CISA KEV, and the exploit status is: Active exploitation is not confirmed from current sources for CVE-2026-89172. Public exploit evidence is: A public PoC is not confirmed from current sources for CVE-2026-89172. The affected-version evidence is listed in the key facts and affected products tables. Defenders should first verify whether exposed or business-critical assets run those versions, then apply vendor patches or mitigations, restrict reachable attack surface, and preserve logs for detection review. CVSS 5.6 describes technical severity, while EPSS 0% helps estimate near-term exploit likelihood; neither replaces asset context. Unknown fields should remain explicit in tickets, and threat actor, IOC, victimology, or payload claims should not be added unless a cited source supports them. Monitor CISA KEV, vendor advisories, NVD changes, public PoC repositories, and internal telemetry for update triggers.