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JLSEC-2026-958 Critical 9.8

ImageMagick: MSL - Stack overflow in ProcessMSLScript

Source Edit History OSV JSON (OSV)

JLSEC Published: Jul 30, 2026
Modified: Jul 30, 2026
Severity: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Packages: ImageMagick_jll < 7.1.2023+0
Upstream: CVE-2026-25971 GHSA-8mpr-6xr2-chhc EUVD-2026-7427

Summary

Magick fails to check for circular references between two MSLs, leading to a stack overflow.

Details

After reading a.msl using magick, the following is displayed:

MSLStartElement -> ReadImage -> ReadMSLImage -> ProcessMSLScript -> xmlParseChunk -> xmlParseTryOrFinish -> MSLStartElement

AddressSanitizer:DEADLYSIGNAL
=================================================================
==114345==ERROR: AddressSanitizer: UNKNOWN SIGNAL on unknown address 0x000000000000 (pc 0x72509fc7d804 bp 0x7ffd6598b390 sp 0x7ffd6598ab20 T0)
    #0 0x72509fc7d804 in strlen ../../../../src/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:388
[...]

References