Is CVE-2026-23519 actively exploited?

No active exploitation of CVE-2026-23519 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-23519 be exploited remotely?

Yes. CVE-2026-23519 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-23519?

CVE-2026-23519 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2026-23519

CWE-208Published: January 15, 2026· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

RustCrypto CMOV provides conditional move CPU intrinsics which are guaranteed on major platforms to execute in constant-time and not be rewritten as branches by the compiler. Prior to 0.4.4, the thumbv6m-none-eabi (Cortex M0, M0+ and M1) compiler emits non-constant time assembly when using cmovnz (portable version). This vulnerability is fixed in 0.4.4.

NVD Source

Risk Analysis

This critical vulnerability in RustCrypto CMOV, a library providing conditional move CPU intrinsics, results in non-constant time assembly on the thumbv6m-none-eabi compiler when using cmovnz. With a CVSS score of 9.8, this flaw can potentially lead to side-channel attacks that compromise confidentiality, integrity, and availability. The absence of an EPSS score and KEV status means its exploitation likelihood is not currently assessed or confirmed in the wild.

No public exploit is currently known for this vulnerability. While remotely exploitable (AV:N) with low attack complexity (AC:L), practical exploitation might require specific environmental conditions related to cryptographic operations.

Recommended Action

Users of RustCrypto CMOV should upgrade to version 0.4.4 or later to address this vulnerability. Developers should always ensure that cryptographic operations are implemented using constant-time primitives to prevent side-channel leakage.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2026-23519 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.