EUVD-2026-60093
GHSA-844w-mwfp-wjwf
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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
AC:H because exploitation requires knowing or brute-forcing the password-derived 64-bit seed before PRNG state can be reconstructed; C:H for full steganographic payload disclosure; no integrity or availability impact applies.
Primary rating from Vendor (VulnCheck).
CVSS VectorVendor: VulnCheck
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/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
Lifecycle Timeline
4DescriptionCVE.org
openssl_encrypt versions before 1.4.0 use Python's non-cryptographic random module for steganographic pixel selection in the generate_pseudorandom_sequence function. Attackers who know the password can recover the Mersenne Twister state from approximately 624 outputs and predict pixel locations containing hidden data for extraction.
Articles & Coverage 1
AnalysisAI
Cryptographically weak PRNG use in openssl_encrypt before 1.4.0 exposes steganographic pixel selection to full state-recovery attacks. The library's steganography module seeds Python's Mersenne Twister with only 64 bits of SHA-256 hash material derived from the user password, then uses it to select pixel positions for hidden data - a design flaw captured by CWE-338. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to possess or derive the steganography password used to seed the PRNG, since the pixel selection sequence is deterministically generated from a 64-bit truncation of SHA-256(password). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base score of 8.7 (AV:N/AC:L/AT:N/PR:N/UI:N/VC:H) correctly captures the high confidentiality impact but overstates ease of exploitation in practice: an attacker must first obtain the steganography password or successfully brute-force a 64-bit seed space before the PRNG state is recoverable - a meaningful but not prohibitive precondition. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker who acquires the steganography password - via phishing, credential reuse, or offline brute-force of the 64-bit truncated SHA-256 seed space - computes the seed value deterministically and replays the Mersenne Twister sequence seeded at that value to reconstruct the exact pixel selection order for any image processed by the victim's installation. The attacker then reads those pixel positions directly from intercepted or publicly available stego-images, extracting the concealed payload without triggering any decryption challenge. … |
| Remediation | Upgrade to openssl-encrypt 1.4.0, which replaces the insecure `random.seed(hash(password))` pattern with an HMAC-SHA256-based CSPRNG implementing Fisher-Yates shuffle and applies HMAC-derived seeds across all steganography format modules, as documented in commit 09e96e090417d34d2f533f6810d3cd4f77810101 and confirmed by the GHSA advisory at https://github.com/jahlives/openssl_encrypt/security/advisories/GHSA-vfgx-5q85-58q3. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit infrastructure and applications to identify all instances of openssl_encrypt usage, particularly in security-sensitive steganographic workflows. …
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