CVE-2026-25794 | ImageMagick has heap-buffer-overflow via signed integer overflow in `WriteUHDRImage` when writing UHDR images with large dimensions

ImageMagick is free and open-source software used for editing and manipulating digital images. `WriteUHDRImage` in `coders/uhdr.c` uses `int` arithmetic to compute the pixel buffer size. Prior to version 7.1.2-15, when image dimensions are large, the multiplication overflows 32-bit `int`, causing an undersized heap allocation followed by an out-of-bounds write. This can crash the process or potentially lead to an out of bounds heap write. Version 7.1.2-15 contains a patch.

Published: 2026-02-24 Last update: 2026-02-24 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-25794 is rated Moderate Risk (42.1/100): CVSS High severity, with low exploitation likelihood (EPSS 0.34%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-25794

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.02% 0.34% +0.32%
2 2026-04-21 0.05% 0.02% -0.03%
3 2026-03-02 — 0.05% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-25794

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.2 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 4.2 [email protected]

Weakness enumeration for CVE-2026-25794

GitHub Security Advisory for CVE-2026-25794

GHSA-vhqj-f5cj-9x8h · Severity: high · Ecosystem: nuget — ImageMagick has heap-buffer-overflow via signed integer overflow in WriteUHDRImage when writing UHDR images with large dimensions

OS Trackers for CVE-2026-25794

vendor priority summary link
alpine — CVE-2026-25794: 1 source package rows (imagemagick); 82 state rows across 2 repos (3.23-community, edge-community); fixed 8, open 74. https://security.alpinelinux.org/vuln/CVE-2026-25794
debian unimportant CVE-2026-25794 unimportant priority: Debian including 1 source packages (imagemagick), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-25794
redhat high — https://access.redhat.com/security/cve/CVE-2026-25794
suse high CVE-2026-25794 severity important: SUSE including 69 source package names (2.2.1-5.54:rsync-3.3.0-slfo.1.1_4.1, 2.2.1-5.62:rsync-3.3.0-slfo.1.1_4.1, …), 266 product×package rows across 44 product lines (Container suse/sl-micro/6.1/baremetal-os-container, Container suse/sl-micro/6.1/base-os-container, … (44 product lines)): Known Not Affected 176, Fixed 76, First Fixed 14. https://www.suse.com/security/cve/CVE-2026-25794/
ubuntu medium CVE-2026-25794 medium priority: Ubuntu including 1 source packages (imagemagick), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needs-triage 8. https://ubuntu.com/security/CVE-2026-25794

Affected software / configurations for CVE-2026-25794

Vendor Product Version Raw CPE
imagemagick imagemagick < 7.1.2-15 cpe:2.3:a:imagemagick:imagemagick:*:*:*:*:*:*:*:*

References for CVE-2026-25794

cvelogic Threat Intelligence