CVE-2026-56367
説明
A vulnerability in the ImageMagick image processing tool could allow an attacker to crash the application or access sensitive information by uploading a maliciously crafted Photoshop (PSB) file.
詳細
A vulnerability in ImageMagick allows attackers to crash the application or expose sensitive data by uploading a corrupted Photoshop (PSB) file. If your system does not process untrusted PSB files, you are not impacted.
軽減策
To reduce the risk, avoid processing untrusted PSB (Photoshop Big) files with ImageMagick. Implement strict input validation for any applications that use ImageMagick to process user-supplied image files. Additionally, consider sandboxing ImageMagick processes to limit potential impact from successful exploitation.
CVSS (Common Vulnerability Scoring System) のスコアの詳細
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
以下の CSVV メトリクスおよびスコアは予備的で、再検討の対象となります。
CVSS v3 スコアの内訳
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| ベーススコア | 4.2 | 9.1 | 3.7 |
| 攻撃ベクトル | Network | Network | Network |
| 攻撃の複雑さ | High | Low | High |
| 必要な権限 | None | None | None |
| ユーザー関与レベル | Required | None | None |
| 範囲 | Unchanged | Unchanged | Unchanged |
| 機密性 | Low | High | Low |
| 完全性への影響 | None | None | None |
| 可用性への影響 | Low | High | None |
ベクトル
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:L
NVD: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
脆弱性の原因 (CWE) の理解
Availability
Technical Impact: DoS: Crash, Exit, or Restart; DoS: Resource Consumption (Memory); DoS: Instability
This weakness can generally lead to undefined behavior and therefore crashes. When the calculated result is used for resource allocation, this weakness can cause too many (or too few) resources to be allocated, possibly enabling crashes if the product requests more resources than can be provided.
Integrity
Technical Impact: Modify Memory
If the value in question is important to data (as opposed to flow), simple data corruption has occurred. Also, if the overflow/wraparound results in other conditions such as buffer overflows, further memory corruption may occur.
Confidentiality,Availability,Access Control
Technical Impact: Execute Unauthorized Code or Commands; Bypass Protection Mechanism
This weakness can sometimes trigger buffer overflows, which can be used to execute arbitrary code. This is usually outside the scope of the product's implicit security policy.
Availability,Other
Technical Impact: Alter Execution Logic; DoS: Crash, Exit, or Restart; DoS: Resource Consumption (CPU)
If the overflow/wraparound occurs in a loop index variable, this could cause the loop to terminate at the wrong time - too early, too late, or not at all (i.e., infinite loops). With too many iterations, some loops could consume too many resources such as memory, file handles, etc., possibly leading to a crash or other DoS.
Access Control
Technical Impact: Bypass Protection Mechanism
If integer values are used in security-critical decisions, such as calculating quotas or allocation limits, integer overflows can be used to cause an incorrect security decision.
よくある質問
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