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CVE-2026-54875· CVE.org (no NVD analysis yet)· CNA openssl

Non-Constant-Time SM2 Scalar Multiplication on ARM64 and RISC-V

Noroxi assessment

Priority: Monitor (action score 14/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.29% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: OpenSSL OpenSSL 3.4.8, 3.5.9, 3.6.5; azl3 cloud-hypervisor 52.0.152-1 on Azure Linux 3.0 Release Notes; azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to OpenSSL OpenSSL 3.4.8, 3.5.9, 3.6.5; azl3 cloud-hypervisor 52.0.152-1 on Azure Linux 3.0 Release Notes; azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Issue summary: A non-constant-time optimized implementation of scalar point multiplication is used for SM2 private key operations on ARM64 and RISC-V platforms. Impact summary: An attacker able to measure the time taken by, or to observe the cache-line access pattern of SM2 signing or decryption on an affected platform can learn information about the secret scalar. CWE: CWE-208: Observable Timing Discrepancy Description: On ARM64 and RISC-V processors, the SM2 curve uses an optimized scalar multiplication implementation whose conditional branches and table look ups are chosen according to the bits of the secret scalar. The execution time and the cache-access pattern therefore depend on the long-term private key (during SM2 decryption) or the per-signature nonce (during SM2 signature generation), forming a timing and cache side-channel. FIPS Impact: no SM2 is not a FIPS algorithm and the optimized SM2 implementation is not part of the FIPS module. OpenSSL 4.0, 3.6, 3.5 and 3.4 are vulnerable to this issue on AArch64 and RISC-V. OpenSSL 3.0, 1.1.1 and 1.0.2 are not affected by this issue. OpenSSL 4.0 users should upgrade to OpenSSL 4.0.3. OpenSSL 3.6 users should upgrade to OpenSSL 3.6.5. OpenSSL 3.5 users should upgrade to OpenSSL 3.5.9. OpenSSL 3.4 users should upgrade to OpenSSL 3.4.8. This issue was reported on 2 May 2026 by Abhinav Agarwal. It was independently reported on 6 June 2026 by Feng Xue. The fix was developed by Igor Ustinov. -- cut (non-publishing metadata for internal use) -- Reported by: Abhinav Agarwal, Feng Xue Fixed by: Igor Ustinov

LowCVSS 3.7 · v3.1—No exploit Fix available
Published
Sep 29, 2026
Updated
Oct 8, 2026
EPSS
0.2% · 20th percentile

Report tools

JSON

Action score

14

Monitor

Low priority for now.

CVSS
14 / 40 · 3.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-54875

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
opensslopenssl

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • openssl openssl3.4.0 and later · before 3.4.8
  • openssl openssl3.5.0 and later · before 3.5.9
  • openssl openssl3.6.0 and later · before 3.6.5
  • openssl openssl4.0.0 and later · before 4.0.3

Versions reported by the vendor

Affected version ranges reported by the assigning authority (openssl). Independent of NVD's CPE analysis and usually ahead of it.

  • OpenSSL OpenSSL

    • 4.0.0 and later · before 4.0.3affected · semver
    • 3.6.0 and later · before 3.6.5affected · semver
    • 3.5.0 and later · before 3.5.9affected · semver
    • 3.4.0 and later · before 3.4.8affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.21opensslfrom 3.4.0 · before 3.3.7-r23.3.7-r2
Debian:13opensslbefore 3.5.7-1~deb13u33.5.7-1~deb13u3
Debian:14opensslbefore 3.6.5-13.6.5-1
Red Hat:hummingbird:1opensslbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl-config-fipsbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl-develbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl-devel-enginebefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl-fips-provider-upstreambefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl-libsbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl-perlbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl3before 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl3-develbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl3-devel-enginebefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
Red Hat:hummingbird:1openssl3-libsbefore 0:3.5.9-0.1.hum10:3.5.9-0.1.hum1
SUSE:Linux Enterprise Module for Basesystem 15 SP7openssl-3before 3.5.0-150700.5.53.23.5.0-150700.5.53.2

Same product

openssl: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-0160The (1) TLS and (2) DTLS implementations in OpenSSL 1.0.1 before 1.0.1g do not properly handle Heartbeat Extension packets, which allows remKEV
    90Now
  • CVE-2021-3711SM2 Decryption Buffer Overflow
    65This week
  • CVE-2003-0545Double free vulnerability in OpenSSL 0.9.7 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code
    65This week
  • CVE-2016-2108The ASN.1 implementation in OpenSSL before 1.0.1o and 1.0.2 before 1.0.2c allows remote attackers to execute arbitrary code or cause a denia
    62This week
  • CVE-2016-6309statem/statem.c in OpenSSL 1.1.0a does not consider memory-block movement after a realloc call, which allows remote attackers to cause a den
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  • CVE-2022-3786X.509 Email Address Variable Length Buffer Overflow
    58Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
OpenSSL OpenSSL3.4.8Vendor (CNA)
OpenSSL OpenSSL3.5.9Vendor (CNA)
OpenSSL OpenSSL3.6.5Vendor (CNA)
OpenSSL OpenSSL4.0.3Vendor (CNA)
azl3 cloud-hypervisor 52.0.152-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kata-containers 4.1.0.kata0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 openssl 3.3.7-6 on Azure Linux 3.03.3.7-7 · Release NotesMicrosoft (MSRC)
azl3 openvmm 0.1.0-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 rust 1.75.0-31 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 rust 1.96.1-2 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
alpine:openssl3.3.7-r2 · Alpine:v3.21Package registry (OSV)
debian:openssl3.5.7-1~deb13u3 · Debian:13Package registry (OSV)
red hat:openssl0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-config-fips0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-devel0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-devel-engine0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-fips-provider-upstream0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-libs0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl-perl0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl30:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl3-devel0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl3-devel-engine0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:openssl3-libs0:3.5.9-0.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
suse:openssl-33.5.0-150700.5.53.2 · SUSE:Linux Enterprise Module for Basesystem 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayOct 16, 2026+17 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-548720 days apartTiming Side-Channel in Scalar Multiplication for Non-NIST EC Curves
    14Monitor
  • CVE-2026-776960 days apartTiming Side-Channel in SM2 Signature Generation
    14Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-208 · Observable Timing Discrepancy

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓
  3. CVSS— → 3.7
  4. Severity— → low
  5. SSVC exploitation— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records