CVE-2026-48813 david-a-wheeler CVE debrief

Who should care

Defenders who use flawfinder to evaluate C/C++ source code, especially those who may be exposed to intentionally malicious filenames or file contents, should be aware of this vulnerability and take steps to mitigate or patch it.

Why it matters

CVE-2026-48813 is a high-severity vulnerability in flawfinder that allows for output manipulation. Defenders should prioritize patching or mitigating this issue to prevent potential output manipulation and XML injection attacks. The vulnerability requires verification of affected versions and remediation status.

• Potential for output manipulation through Terminal/ANSI Escape Sequence Injection
• Potential for XML Injection in structured reports
• Risk of corrupted CSV formats or arbitrary XML attributes in SonarQube outputs
• Need for verification of affected versions and remediation status

Technical summary

Flawfinder, a static analysis tool for C/C++ source code, has an improper input neutralization issue leading to output manipulation in versions prior to 2.0.20. This allows for Terminal/ANSI Escape Sequence Injection and XML Injection when processing malicious files. The vulnerability is patched in version 2.0.20. Defenders should prioritize upgrading to flawfinder version 2.0.20 or later to prevent output manipulation through Terminal/ANSI Escape Sequence Injection and XML Injection. For those unable to upgrade immediately, mitigating controls such as pre-scanning filenames and inspecting raw output can help reduce risk.

Defensive priority

Defenders should prioritize upgrading to flawfinder version 2.0.20 or later to prevent output manipulation through Terminal/ANSI Escape Sequence Injection and XML Injection. For those unable to upgrade immediately, mitigating controls such as pre-scanning filenames and inspecting raw output can help reduce risk.

Recommended defensive actions

• Upgrade to flawfinder version 2.0.20 or later
• Pre-scan filenames for malicious ANSI escape sequences
• Inspect raw output for signs of output manipulation
• Restrict untrusted inputs to flawfinder
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability in flawfinder versions prior to 2.0.20. The issue allows for output manipulation via Terminal/ANSI Escape Sequence Injection and XML Injection. A patch is available in version 2.0.20.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.