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MEDIUM severity

CVE-2023-26364

MEDIUM

CVE-2023-26364 is a medium-severity (CVSS 5.3) Improper Input Validation vulnerability in adobe css-tools. O3 Security detects and blocks CVE-2023-26364 exploitation at runtime via eBPF exploit-chain detection and L7 egress monitoring, even on unpatched systems.

@adobe/css-tools version 4.3.0 and earlier are affected by an Improper Input Validation vulnerability that could result in a minor denial of service while attempting to parse CSS. Exploitation…

Published
Nov 17, 2023
Updated
Jun 17, 2026
Affected
1 product
Patched
See advisory
Exploits
None indexed
Exploitation data as of Jun 17, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Description

@adobe/css-tools version 4.3.0 and earlier are affected by an Improper Input Validation vulnerability that could result in a minor denial of service while attempting to parse CSS. Exploitation of this issue does not require user interaction or privileges.

Affected Products

1 product · 1 configurations
Application
css-toolsadobe
< 4.3.1
range

Detection & mitigation playbook

Vendor / appliance
  1. Detect

    Inventory every adobe css-tools deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

  2. Fix

    Apply the adobe css-tools security patch or hotfix for CVE-2023-26364 on the affected version, following the vendor advisory for your exact build.

  3. Workarounds

    Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

  4. How O3 protects you

    O3 detects and blocks CVE-2023-26364 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Tailored to CVE-2023-26364. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

@adobe/css-tools version 4.3.0 and earlier are affected by an Improper Input Validation vulnerability that could result in a minor denial of service while attempting to parse CSS. Exploitation of this issue does not require user interaction or privileges.
O3 Security · Runtime Protection

Is CVE-2023-26364 being exploited in your environment?

O3's eBPF runtime sensors and L7 egress monitoring detect and block the CVE-2023-26364 exploit chain at execution — protecting unpatched and end-of-life systems until the vendor patch is applied.