ImageMagick before 6.9.13-57 and 7.x before 7.1.2-32 lacks proper synchronization when the security policy is accessed, so simultaneous reads and writes of the policy by multiple threads trigger a race condition that causes a heap buffer over-write. An attacker able to induce concurrent security policy access can crash the application, causing a denial of service.
https://github.com/ImageMagick/ImageMagick6/commit/9ddc71abea5cbe7d18164fa0f0077a105cab514f
https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-8x3v-wr32-qqh4
https://github.com/ImageMagick/ImageMagick/commit/12db6f04e895deae4537ead10c771a244607794a
Published: 2026-10-12
Updated: 2026-10-13
Base Score: 1
Vector: CVSS2#AV:L/AC:H/Au:S/C:N/I:N/A:P
Severity: Low
Base Score: 2.5
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L
Severity: Low
Base Score: 2
Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Severity: Low
EPSS: 0.00087