C source injection via nonconstant-time HMAC comparison
Published Apr 24, 2026 · Updated Apr 24, 2026
Observable timing discrepancy in Mojic before 2.1.4 allows attackers to inject C source code through a tampered .mojic file. CipherEngine.getDecryptStream() compares attacker-controlled footerHex with the calculated HMAC-SHA256 digest using !==, whose early exit leaks the matching prefix length through decryption timing. Exploitation requires repeated local measurements and user decryption of the forged file; the bounded consequence is unauthorized modification of restored C source code.
Summary
What happened
Observable timing discrepancy in Mojic before 2.1.4 allows attackers to inject C source code through a tampered .mojic file. CipherEngine.getDecryptStream() compares attacker-controlled footerHex with the calculated HMAC-SHA256 digest using !==, whose early exit leaks the matching prefix length through decryption timing. Exploitation requires repeated local measurements and user decryption of the forged file; the bounded consequence is unauthorized modification of restored C source code.
The record
- CVE
- CVE-2026-41244
- Published
- Apr 24, 2026
- Updated
- Apr 24, 2026
- Vendor
- Amit Dutta
- Product
- Mojic
- Classifications
- CWE-208, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Apr 24, 2026CVE publishedPublication date reported by the CVE source.
- Apr 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=< 2.1.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
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Technologies
Your stack
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Your stack
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