Is CVE-2026-48090 actively exploited?

No active exploitation of CVE-2026-48090 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-48090 be exploited remotely?

Yes. CVE-2026-48090 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-48090?

CVE-2026-48090 has a CVSS score of 5.9 (MEDIUM).

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MEDIUM

CVE-2026-48090

CWE-416Published: June 26, 2026· Updated: Jun 29, 2026

5.9

CVSS v3.1

EPSS:0.56%probability of exploitation in 30 daysPercentile:42.2th

Official Description

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.37.0 until 1.37.5 and 1.38.3, the HTTP OAuth2 filter (envoy.filters.http.oauth2) can leave an in-flight async token exchange attached to a downstream stream that has already been torn down. A late AsyncClient completion can still invoke OAuth2Filter methods that use StreamDecoderFilterCallbacks after that object’s lifetime has ended, causing undefined behavior, worker crashes (availability loss), and use-after-free / invalid-vptr failures under AddressSanitizer. This is a memory-safety / lifetime issue in the data plane, not a trivial config bug. Remote code execution is not claimed here; the primary demonstrated impact is DoS via crash and UB; any further impact would be deployment- and allocator-dependent. This vulnerability is fixed in 1.37.5 and 1.38.3.

NVD Source

Technical Analysis

CVE-2026-48090 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 availability disruption (denial of service), with a CVSS base score of 5.9.

From a weakness classification perspective (CWE-416): Use-after-free vulnerabilities involve accessing memory after it has been freed, often enabling arbitrary code execution.