Security readout for executives and security teams
Plain-English summary
CVE-2026-27798 affects ImageMagick when handling very small images with the wavelet denoise feature. It can read past heap memory bounds, potentially exposing limited process memory. The published severity is medium, with low confidentiality impact and no stated integrity or availability impact. Patched ImageMagick versions are available.
Executive priority
Prioritize patching where ImageMagick processes user-supplied images, especially in web, media, document, or automation pipelines. This is not currently evidenced as exploited and has limited stated impact, but image parsing bugs are commonly reachable in business applications.
Technical view
ImageMagick before 7.1.2-15 and 6.9.13-40 has a heap buffer over-read in WaveletDenoise when processing small-dimension images using the `-wavelet-denoise` operator. The CVSS 3.1 score is 4.0: AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N. Mapped weaknesses are CWE-125 and CWE-126.
Likely exposure
Exposure is most likely in systems that run ImageMagick or dependent bindings against untrusted images and apply wavelet denoising. Risk is lower where ImageMagick is not installed, image processing is trusted-only, or the affected operator is not used. Exact exposure depends on application workflow and packaged ImageMagick version.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked KEV. Exploitation requires reaching an ImageMagick processing path that uses wavelet denoise on small images. The documented impact is limited memory disclosure, not code execution.
Researcher notes
The advisory attributes the issue to WaveletDenoise handling of small images and lists fixed versions. The commit is the primary patch reference. No exploit status, proof-of-concept, or broader product impact is provided in the source bundle. Avoid assuming remote exposure unless an application accepts and processes attacker-controlled images.
Mitigation direction
- Upgrade ImageMagick 7.x to 7.1.2-15 or later.
- Upgrade ImageMagick 6.x to 6.9.13-40 or later.
- If using Magick.NET, review the 14.10.3 release guidance.
- Restrict untrusted image processing until patched, especially wavelet denoise workflows.
- Check vendor or distribution advisories for backported fixed packages.
Validation and detection
- Inventory ImageMagick versions across servers, containers, and build images.
- Identify applications invoking `-wavelet-denoise` or equivalent library APIs.
- Confirm patched versions: 7.1.2-15+ or 6.9.13-40+.
- Review dependency manifests for ImageMagick wrappers or bundled binaries.
- Track OS distribution security updates for backported fixes.
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-125: 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 lookupCWE-126: 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-2026-27798 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
- Medium
- CVSS
- 4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
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.
CVSS vector scores
1 official scoreWe 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:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N2.51.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-qpgx-jfcq-r59fCVE reference · x_refsource_CONFIRM
- https://github.com/ImageMagick/ImageMagick/commit/0377e60b3c0d766bd7271221c95d9ee54f6a3738CVE reference · x_refsource_MISC
- https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3CVE reference · x_refsource_MISC
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.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Buffer Over-read
Buffer Over-read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.