Security readout for executives and security teams
Plain-English summary
ImageMagick before 7.1.2-15 can allocate too small a heap buffer when writing very large UHDR images, then write past it. For businesses, the main concern is service disruption in systems that process attacker-controlled images; the source also notes a potential out-of-bounds heap write.
Executive priority
Prioritize remediation for internet-facing or partner-facing image processing services. The business risk is primarily outage or processing service instability, with some memory-corruption uncertainty. Internal-only, tightly controlled conversion jobs are lower priority but should still be updated during normal patch cycles.
Technical view
In coders/uhdr.c, WriteUHDRImage uses 32-bit int arithmetic for pixel buffer size calculation. Large dimensions can trigger signed integer overflow, causing undersized allocation and heap out-of-bounds writes. The CVSS 3.1 score is 8.2, with network attack vector, low complexity, no privileges, no user interaction, low confidentiality impact, and high availability impact.
Likely exposure
Exposure is most likely where ImageMagick below 7.1.2-15 processes or writes UHDR images from untrusted or semi-trusted inputs, including upload pipelines, media conversion services, thumbnailers, and back-end batch processors. Downstream Linux packages may need vendor-specific status checks.
Exploitation context
The provided sources do not establish active exploitation, public weaponization, or KEV listing. The vulnerability is remotely reachable in the CVSS assessment when a service accepts suitable image-processing input, but the bundle only supports crash or potential heap write impact, not confirmed code execution.
Researcher notes
Key evidence is the ImageMagick advisory description, CVSS vector, affected version range, and fixed release. No source in the bundle confirms exploit-in-the-wild activity, a public proof of concept, or reliable code execution. Validation should focus on version provenance and whether UHDR writing is reachable from untrusted inputs.
Mitigation direction
- Upgrade ImageMagick to version 7.1.2-15 or later where available.
- Check distribution vendor advisories for backported fixes and affected package status.
- Restrict untrusted image conversion workflows until patched, especially UHDR output paths.
- Apply image dimension and resource limits for upload and conversion services.
- Monitor ImageMagick and Linux vendor guidance for any revised remediation details.
Validation and detection
- Inventory applications, containers, and jobs that include ImageMagick.
- Confirm installed or bundled ImageMagick versions are 7.1.2-15 or patched builds.
- Identify workflows that write UHDR images from user-controlled input.
- Review package vendor notices for backport status and fixed build identifiers.
- Verify operational image size limits are enforced in exposed conversion paths.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-122: Exact CWE lookup
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Open ATT&CK lookupCWE-190: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-25794 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H3.94.2GitHub_MCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H3.94.2redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Base CVSS 3.1 score
8.2HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Made public.
- CVE publishedCVE Program
The CVE record was published.
- ADP timelineredhat-SADP
Reported to Red Hat.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-02-24T02:01:50.796Z: Reported to Red Hat.
- 2026-02-24T00:53:23.396Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-vhqj-f5cj-9x8hCVE reference, GitHub_M · x_refsource_CONFIRM
- https://access.redhat.com/security/cve/CVE-2026-25794CVE reference, redhat-SADP · vdb-entry, x_refsource_REDHAT
- RHBZ#2442110CVE reference, redhat-SADP · issue-tracking, x_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25794.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Heap-based Buffer Overflow
Heap-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.