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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.

PUBLISHED Reserved 2026-04-27 | Published 2026-04-28 | Updated 2026-04-29 | Assigner VulnCheck




MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

MEDIUM: 4.3CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

Default status
unaffected

Any version before 2026.4.8
affected

2026.4.8 (semver)
unaffected

Credits

zsx (@zsxsoft) reporter

KeenSecurityLab finder

References

github.com/...enclaw/security/advisories/GHSA-ccx3-fw7q-rr2r (GitHub Security Advisory (GHSA-ccx3-fw7q-rr2r)) vendor-advisory

github.com/...ommit/d7c3210cd6f5fdfdc1beff4c9541673e814354d5 (Patch Commit) patch

www.vulncheck.com/...mproper-base64-decoding-size-validation (VulnCheck Advisory: OpenClaw < 2026.4.8 - Improper Base64 Decoding Size Validation) third-party-advisory

cve.org (CVE-2026-42420)

nvd.nist.gov (CVE-2026-42420)

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