Medium [CVE-2026-56371] Denial of Service due to memory leak in TXT file processing
This medium-severity Red Hat Linux advisory covers CVE-2026-56371 affecting Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat package: imagemagick.
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Summary
ImageMagick before 7.1.2-15 and 6.9.13-40 contains a memory leak in coders/txt.c when processing TXT files with texture attributes: the texture object allocated via ReadImage is not released when GetTypeMetrics fails, leaking memory each time a crafted TXT file with a texture attribute is processed.
Processing specially crafted TXT files with malicious texture attributes can exhaust system memory, allowing an attacker to cause a Denial of Service (DoS). A moderate-impact memory leak in ImageMagick can cause a Denial of Service (DoS) if a user or automated system is tricked into processing a maliciously crafted TXT file.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H). Weakness: CWE-772.
Affected Red Hat products: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: imagemagick.
- < 7.1.2-15
- < 6.9.13-40
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Mitigation checklist
- If your application does not explicitly require rendering TXT files via ImageMagick, you should disable the vulnerable coder entirely. This removes the attack vector at the application layer. If ImageMagick is executed by a background service, worker queue, or web server (such as httpd or nginx), utilize systemd's control groups (cgroups) to isolate the process's memory pool. This ensures that if the leak is triggered, the Linux Out-Of-Memory (OOM) killer only terminates the offending worker rather than crashing the entire OS.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
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