{"id":"CVE-2026-42420","aliases":["GHSA-ccx3-fw7q-rr2r"],"url":"https://o3.security/vulnerability/CVE-2026-42420","summary":"OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation","details":"## Impact\n\nMultiple Code Paths Missing Base64 Pre-Allocation Size Checks.\n\nSeveral base64 decode paths could allocate before enforcing decoded-size limits.\n\nOpenClaw is a user-controlled local assistant. This advisory is scoped to the OpenClaw trust model and does not assume a multi-tenant service boundary.\n\n## Affected Packages / Versions\n\n- Package: `openclaw` (npm)\n- Affected versions: `<=v2026.4.2`\n- Patched versions: `2026.4.8`\n\n## Fix\n\nThe issue was fixed on `main` and is available in the patched npm version listed above. The verified fixed tree is commit `d7c3210cd6f5fdfdc1beff4c9541673e814354d5`.\n\n## Verification\n\nThe fix was re-checked against `main` before publication, including targeted regression tests for the affected security boundary.\n\n## Credits\n\nThanks @zsxsoft and @KeenSecurityLab for reporting.","published":"2026-04-28T18:10:11.948Z","modified":"2026-08-17T03:48:14.861732663Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"openclaw","fixedVersion":"2026.4.8"}],"fix":{"url":"https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5","label":"openclaw/openclaw@d7c3210"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/42xxx/CVE-2026-42420.json"},{"type":"ADVISORY","url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-ccx3-fw7q-rr2r"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-42420"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/openclaw-improper-base64-decoding-size-validation"},{"type":"FIX","url":"https://github.com/openclaw/openclaw/commit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5"},{"type":"PACKAGE","url":"https://github.com/openclaw/openclaw"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-17T03:48:14.861732663Z"}}