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ImageMagick CVE-2026-56369

| EUVDEUVD-2026-40449 MEDIUM
Reusing a Nonce, Key Pair in Encryption (CWE-323)
2026-06-30 VulnCheck GHSA-vgqj-4jhr-3wh5
Information Disclosure Red Hat Imagemagick Suse
6.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
6.3 MEDIUM
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/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
vuln.today AI
3.7 LOW

Network vector because encrypted images traverse networks; AC:H for required same-nonce ciphertext collection; PR:N since no authentication to ImageMagick itself is needed; C:L for partial plaintext recovery only.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
3.7 LOW
AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
Red Hat
3.7 LOW
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Patch available
Jul 01, 2026 - 02:16 EUVD
Analysis Generated
Jun 30, 2026 - 23:33 vuln.today

DescriptionCVE.org

ImageMagick before 7.1.2-22 contains an information disclosure vulnerability in the PasskeyEncipherImage method due to AES-CTR nonce reuse. Attackers can exploit nonce reuse in the cipher implementation to recover plaintext information from encrypted images.

AnalysisAI

Nonce reuse in ImageMagick's AES-CTR cipher implementation exposes encrypted image plaintext to recovery attacks. The PasskeyEncipherImage method in ImageMagick before 7.1.2-22 reuses nonces when performing AES in Counter mode, violating the fundamental security requirement that a nonce be used exactly once per key. A network-accessible attacker who can collect multiple ciphertexts produced with the same passkey and nonce can XOR the outputs to cancel the shared keystream and partially or fully recover encrypted image content. No active exploitation has been identified (not in CISA KEV), and no public exploit code is known at time of analysis.

Technical ContextAI

AES-CTR (Counter Mode) is a stream-cipher construction where plaintext is XORed with a keystream derived from AES(key, nonce || counter). The critical property of CTR mode is that reusing the same (key, nonce) pair across two plaintexts means both share an identical keystream - XORing the two resulting ciphertexts cancels the keystream entirely, yielding the XOR of the two plaintexts, from which both can often be recovered statistically or structurally. CWE-323 (Reusing a Nonce, Key Pair in Encryption) precisely classifies this root cause. The affected function is PasskeyEncipherImage, ImageMagick's built-in image-encryption feature, identified via CPE cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:* covering all versions prior to the fix. The vulnerability is cryptographic in nature - not a memory-safety or injection issue - meaning it leaves no crash signature and may be difficult to detect in logs.

RemediationAI

Upgrade ImageMagick to version 7.1.2-22 or later, which resolves the AES-CTR nonce reuse in PasskeyEncipherImage. The authoritative patch reference is the GitHub Security Advisory GHSA-qv2q-c278-pch5 at https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-qv2q-c278-pch5. For deployments where immediate patching is not possible, the most targeted compensating control is to cease use of the PasskeyEncipherImage feature entirely - encrypted image processing can be deferred or offloaded to external, vetted encryption tooling (e.g., libsodium-based wrappers) without loss of core ImageMagick functionality. If image encryption must continue pre-patch, ensure that each encryption operation uses a unique, cryptographically random nonce and that no two images share the same passkey and session context - though this mitigation requires application-layer changes and may not be feasible without code modification. Note that discontinuing PasskeyEncipherImage will break any existing workflows relying on ImageMagick's native image encryption; plan decryption of existing encrypted assets prior to disabling.

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Vendor StatusVendor

SUSE

Severity: Low
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected

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CVE-2026-56369 vulnerability details – vuln.today
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