CVE-2026-35656
OpenClaw < 2026.3.22 - XFF Loopback Spoofing Bypass in Canvas Authentication and Rate Limiter
OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
OpenClaw < 2026.3.22 - XFF Loopback Spoofing Bypass in Canvas Authentication and Rate Limiter
OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.
- Record
CVE-2026-35656- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
EUVDEUVD-2026-21458
OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.
- Record
EUVD-2026-21458- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-844j-xrrq-wgh4
OpenClaw: Forwarding header spoofing bypasses gateway.trustedProxies origin detection
Summary
When gateway.trustedProxies was configured, spoofed loopback hops in forwarding headers could be accepted as the client origin and weaken downstream auth and rate-limit decisions.
Affected Packages / Versions
- Package:
openclaw(npm) - Affected: < 2026.3.22
- Fixed: >= 2026.3.22
- Latest released tag checked:
v2026.3.23-2(630f1479c44f78484dfa21bb407cbe6f171dac87) - Latest published npm version checked:
2026.3.23-2
Fix Commit(s)
fc2d29ea926f47c428c556e92ec981441228d2a4
Release Status
The fix shipped in v2026.3.22 and remains present in v2026.3.23 and v2026.3.23-2.
Code-Level Confirmation
- src/gateway/net.ts now ignores loopback forwarded hops before trusted-proxy client resolution.
- That shipped origin fix is the one consumed by canvas auth and gateway auth-rate-limit paths that rely on resolved client identity.
OpenClaw thanks @lintsinghua for reporting.
- Record
GHSA-844j-xrrq-wgh4- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
NVD
OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.
- Record
CVE-2026-35656- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
OSV
OpenClaw < 2026.3.22 - XFF Loopback Spoofing Bypass in Canvas Authentication and Rate Limiter
OpenClaw before 2026.3.22 contains an authentication bypass vulnerability in the X-Forwarded-For header processing when trustedProxies is configured, allowing attackers to spoof loopback hops. Remote attackers can inject forged forwarding headers to bypass canvas authentication and rate-limiting protections by masquerading as loopback clients.
- Record
CVE-2026-35656- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-290
- Updated
- 2026-11-02
OSVGHSA-844j-xrrq-wgh4
OpenClaw: Forwarding header spoofing bypasses gateway.trustedProxies origin detection
Summary
When gateway.trustedProxies was configured, spoofed loopback hops in forwarding headers could be accepted as the client origin and weaken downstream auth and rate-limit decisions.
Affected Packages / Versions
- Package:
openclaw(npm) - Affected: < 2026.3.22
- Fixed: >= 2026.3.22
- Latest released tag checked:
v2026.3.23-2(630f1479c44f78484dfa21bb407cbe6f171dac87) - Latest published npm version checked:
2026.3.23-2
Fix Commit(s)
fc2d29ea926f47c428c556e92ec981441228d2a4
Release Status
The fix shipped in v2026.3.22 and remains present in v2026.3.23 and v2026.3.23-2.
Code-Level Confirmation
- src/gateway/net.ts now ignores loopback forwarded hops before trusted-proxy client resolution.
- That shipped origin fix is the one consumed by canvas auth and gateway auth-rate-limit paths that rely on resolved client identity.
OpenClaw thanks @lintsinghua for reporting.
- Record
GHSA-844j-xrrq-wgh4- CVSS 4.0
- 6.3 Medium
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N - CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N - Weakness
- CWE-290
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
openclawnpm |
before 2026.3.22 | 2026.3.22 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-35656 is a medium vulnerability (CVSS 6.3) in Openclaw, published March 26, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 25th percentile. Fixed in openclaw 2026.3.22.
References
github.com/openclaw/openclaw/security/advisories/GHSA-844j-xrrq-wgh4
vulncheck.com/advisories/openclaw-xff-loopback-spoofing-bypass-in-canvas-authentication-and-rate-limiter
nvd.nist.gov/vuln/detail/CVE-2026-35656