Low [CVE-2026-56374] Denial of Service and Information Disclosure via heap buffer overflow in FTXT encoder
This low-severity Red Hat Linux advisory covers CVE-2026-56374 affecting Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat package: imagemagick.
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Summary
ImageMagick before 7.1.2-19 contains a heap buffer overflow vulnerability in the FTXT encoder due to missing boundary checks when parsing ftxt:format. Remote attackers can trigger an out of bounds read by crafting malicious FTXT image files to cause denial of service or information disclosure.
A remote attacker could exploit this using a specially crafted FTXT image to cause a denial of service or disclose sensitive information. This low-impact heap buffer overflow in ImageMagick's FTXT encoder, caused by insufficient boundary checks, could lead to denial of service or information disclosure if a user opens a specially crafted FTXT file.
Red Hat severity: Low — CVSS 3.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L). Weakness: CWE-125.
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.
- < 7.1.2-19
Official advisory · high-confidence parse· fetched 3 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 3 days ago·verify at source
Mitigation checklist
- To mitigate this, disable the vulnerable FTXT format by adding the following line to your ImageMagick security policy file (typically /etc/ImageMagick-7/policy.xml): <policy domain="coder" rights="none" pattern="FTXT" /> Applying this mitigation will immediately block ImageMagick from processing any files in the FTXT format, but requires no service restarts or downtime.
Official advisory · high-confidence parse· fetched 3 days ago·verify at source
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