EUVD-2026-77478
GHSA-xqgm-rj39-m8r4
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
Network delivery of malicious schema is feasible, but user must invoke the compiler (UI:R); only the compiler process crashes with no confidentiality or integrity impact (A:L).
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
A vulnerability was determined in Dvidelabs flatcc up to 0.6.3. This impacts the function align_order_members of the file src/compiler/semantics.c of the component Duplicate Symbol Handler. This manipulation causes reachable assertion. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. Patch name: 8b19ba4e992ebcad7f5970704d1afc5507fa5205. To fix this issue, it is recommended to deploy a patch.
AnalysisAI
Reachable assertion in the flatcc FlatBuffers schema compiler (versions 0.6.0-0.6.3) crashes the compiler process when a crafted schema file containing duplicate symbol declarations is processed. The align_order_members function in src/compiler/semantics.c proceeds into member-ordering logic after the parser has already recorded a failure state due to duplicate symbols, violating the function's internal invariant that no duplicates exist and triggering an assertion abort (CWE-617). …
Unlock full vulnerability intelligence
- Risk assessment & exploitation conditions
- Attack chain visualization
- Remediation with exact patch versions
- Threat intelligence from 22 sources
- Personal watchlist & email alerts
Free forever · No credit card required
Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires supplying a crafted FlatBuffers schema file (`.fbs`) with duplicate symbol declarations to an instance of the flatcc compiler (versions 0.6.0-0.6.3). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VA:L, score 5.5) correctly characterizes this as medium severity with only low availability impact - the consequence is a compiler process crash, not code execution, data exfiltration, or any runtime service disruption. … 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 | Apply fix commit 8b19ba4e992ebcad7f5970704d1afc5507fa5205, which adds early-return guards before `align_order_members` in `process_table` and before semantic analysis in `fb_build_schema`. … Detailed patch versions, workarounds, and compensating controls in full report. |
Threat intelligence, references, and detailed analysis are available after sign-in.
Same weakness CWE-617 – Reachable Assertion
View allSame technique Denial Of Service
View allShare
External POC / Exploit Code
Leaving vuln.today