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A high-severity integrity bypass vulnerability, identified as CVE-2026-31839, existed in Striae’s digital confirmation workflow prior to version 3.0.0 . Striae is a digital comparison tool used by firearms examiners, making the integrity of its confirmation packages critical for forensic and chain-of-custody purposes . The root cause of the vulnerability lies in the application’s hash-only validation mechanism for manifest files . The software trusted the hash fields within the manifest to verify the integrity of the package contents. However, an attacker with local access could tamper with the package content and then simply recompute and modify the corresponding hash values in the manifest. Because both the content and the hash values were mutable within the same trust boundary, the tampered confirmation package would still pass all integrity checks . This flaw allowed a malicious actor to alter confirmation data without detection, potentially undermining the validity of forensic evidence . The vulnerability requires local access and user interaction but no privileges, making it accessible to any user with local system access . The issue has been addressed in Striae version 3.0.0, which introduces server-issued asymmetric signatures and canonical payload signature verification to ensure immutability .
dailycve form:
Platform: Striae
Version: prior v3.0.0
Vulnerability: hash-only validation
Severity: HIGH CVSS 8.2
date: March 12, 2026
Prediction: Patch already v3.0.0
What Undercode Say:
Analytics
The vulnerability CVE-2026-31839 stems from improper validation of integrity check values (CWE-354) . Attack complexity is low, and while local access is required, the potential impact on confidentiality and integrity is high, with a CVSS score of 8.2 . The exploitability score of 1.8 indicates ease of exploitation once access is achieved .
Bash Commands and Code
Check current Striae version:
Command to check the installed version of Striae (example) striae --version or apt show striae | grep Version
Simulate hash tampering (Conceptual – for understanding):
An attacker could modify content and then recompute the hash
Example: Modify a confirmation file
echo "tampered data" >> confirmation.manifest
Recalculate the hash (e.g., SHA256) and update the manifest field
new_hash=$(sha256sum confirmation.manifest | awk '{print $1}')
The vulnerable app would then see the new hash match the new content
How Exploit
An attacker with local access to a system running Striae before v3.0.0 could perform the following steps:
1. Locate an exported confirmation package.
- Modify the package content (e.g., forensic data, timestamps, examiner notes).
- Recalculate the cryptographic hash of the modified content.
- Replace the original hash value in the package manifest with the newly calculated one.
- The vulnerable application, performing only hash validation, would verify the new hash against the new content and deem the package intact.
Protection from this CVE
To protect against this vulnerability, organizations must:
- Upgrade: Immediately update to Striae version 3.0.0 or later, which introduces server-issued asymmetric signatures for forensic manifests .
- Verify Signatures: Ensure that signature verification is enabled and enforced during the import of confirmation packages.
- Restrict Access: Limit local access to trusted personnel only and monitor systems running Striae for unauthorized activity .
- Use Out-of-Band Verification: Until upgraded, treat hash-only validation as a tamper indicator and require manual reviewer attestation for sensitive workflows .
Impact
Successful exploitation allows an attacker to bypass integrity checks, leading to the acceptance of falsified confirmation data . In the forensic context of Striae, this could compromise the chain of custody and undermine the validity of evidence in legal proceedings . The vulnerability impacts both the integrity and confidentiality of the data, with high severity due to its potential to erode trust in forensic workflows .
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Sources:
Reported By: github.com
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