EUVD-2026-55224
GHSA-x3w9-j9j5-qcw7
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable unauthenticated endpoint, no complexity or interaction required; impact is solely complete availability loss via process termination.
Primary rating from Vendor (TuranSec).
CVSS VectorVendor: TuranSec
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
3DescriptionCVE.org
A NULL pointer dereference vulnerability in fastschema through v0.15.1 allows an unauthenticated remote attacker to crash the server process with a single HTTP request. The sendOTPEmail function in pkg/auth/local.go dereferences a pointer obtained from an unchecked error path without validating it is non-nil, causing a fatal panic that terminates the entire server when a recovery request is sent to the /api/auth/local/recover endpoint.
AnalysisAI
NULL pointer dereference in fastschema through v0.15.1 enables an unauthenticated remote attacker to crash the entire server process with a single HTTP request targeting the password-recovery endpoint. The flaw originates in the sendOTPEmail function in pkg/auth/local.go, which dereferences a pointer from an unchecked error path without nil validation, triggering a fatal Go panic that terminates the server. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The vulnerable endpoint /api/auth/local/recover must be network-accessible to the attacker - this is the only condition. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately reflects the exploitation profile: the attack is fully remote, requires no authentication, no user interaction, and no special attack complexity - a single malformed or crafted request to the /api/auth/local/recover endpoint is sufficient to bring down the server. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched version has been independently confirmed from the available reference data; consumers should monitor the upstream repository at https://github.com/fastschema/fastschema for a tagged release addressing this nil-check deficiency in pkg/auth/local.go. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify and inventory all fastschema deployments through v0.15.1 and determine whether the password-recovery endpoint is internet-accessible. …
Sign in for detailed remediation steps and compensating controls.
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Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Null Pointer Dereference
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External POC / Exploit Code
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