Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-ccx3-fw7q-rr2r
Advisory ID github_osv/GHSA-ccx3-fw7q-rr2r
Aliases CVE-2026-42420
Summary OpenClaw: Multiple Code Paths Missing Base64 Pre-Allocation Size Checks ## Impact Multiple Code Paths Missing Base64 Pre-Allocation Size Checks. Several base64 decode paths could allocate before enforcing decoded-size limits. OpenClaw is a user-controlled local assistant. This advisory is scoped to the OpenClaw trust model and does not assume a multi-tenant service boundary. ## Affected Packages / Versions - Package: `openclaw` (npm) - Affected versions: `<=v2026.4.2` - Patched versions: `2026.4.8` ## Fix The issue was fixed on `main` and is available in the patched npm version listed above. The verified fixed tree is commit `d7c3210cd6f5fdfdc1beff4c9541673e814354d5`. ## Verification The fix was re-checked against `main` before publication, including targeted regression tests for the affected security boundary. ## Credits Thanks @zsxsoft and @KeenSecurityLab for reporting.
Status Published
Exploitability 0.5
Weighted Severity 4.6
Risk 2.3
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-770 Allocation of Resources Without Limits or Throttling
System Score Found at
cvssv3.1 4.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-ccx3-fw7q-rr2r/GHSA-ccx3-fw7q-rr2r.json
cvssv4 5.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-ccx3-fw7q-rr2r/GHSA-ccx3-fw7q-rr2r.json
generic_textual MODERATE
Reference id Reference type URL
https://github.com/openclaw/openclaw
https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5
https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r
https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation
CVE-2026-42420 https://nvd.nist.gov/vuln/detail/CVE-2026-42420
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-ccx3-fw7q-rr2r/GHSA-ccx3-fw7q-rr2r.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-ccx3-fw7q-rr2r/GHSA-ccx3-fw7q-rr2r.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.