CVE-2026-42420
OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation
- State
- Published
- Severity
- 5.3 Medium
- Published
- Apr 28, 2026
- Updated
- Apr 29, 2026
- Reserved
- Apr 27, 2026
Description
OpenClaw before 2026.4.8 contains improper input validation in base64 decode paths that allocate memory before enforcing decoded-size limits. Attackers can exploit multiple code paths to cause memory exhaustion or denial of service through crafted base64-encoded input.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.3 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.3 Medium | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-770 Allocation of Resources Without Limits or Throttling
Affected Products
| Product | Versions |
|---|---|
OpenClawOpenClaw |
|
References
- GitHub Security Advisory (GHSA-ccx3-fw7q-rr2r)vendor-advisory
- Patch Commitpatch
- VulnCheck Advisory: OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validationthird-party-advisory
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