Vulnerability in imagemagick (UBUNTU-CVE-2026-25794)

Summary

Vulnerability in imagemagick (UBUNTU-CVE-2026-25794). Risk of unauthorized operations or information disclosure. Exploitable via WriteUHDRImage. Mitigation: upgrade to 8:7.1.2.3+dfsg1-1ubuntu0.1 or later.

Original description

The description as published by the source.

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.

Source: OSV.dev (Open Source Vulnerabilities) OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as UBUNTU-CVE-2026-25794 has been found in imagemagick.
Attackers can target a specific entry point like WriteUHDRImage over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade imagemagick to 8:7.1.2.3+dfsg1-1ubuntu0.1 or later.
If unsure, ask your IT team or search "imagemagick UBUNTU-CVE-2026-25794" on the vendor's site.

UBUNTU-CVE-2026-25794 (imagemagick)
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: WriteUHDRImage / int
Patched: 8:7.1.2.3+dfsg1-1ubuntu0.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (unclassified) exists in imagemagick. Attackers reach the vulnerable code path via WriteUHDRImage without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of imagemagick. Attack surface: WriteUHDRImage / int.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 8:7.1.2.3+dfsg1-1ubuntu0.1.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'imagemagick' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

1
Identify exposure identify
```
grep -r 'imagemagick' . | grep -v node_modules
```
リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で imagemagick を grep し、稼働しているサービス・バージョンを把握する。
2
Apply patch patch
```
Upgrade imagemagick to 8:7.1.2.3+dfsg1-1ubuntu0.1
```
ステージング環境で 8:7.1.2.3+dfsg1-1ubuntu0.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
3
Post-deployment verification verify
```
Confirm patched version is live in production
```
パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Ubuntu:25.10 imagemagick

[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"8:7.1.2.3+dfsg1-1ubuntu0.1"}]}]

References

advisory ubuntu.com
report ubuntu.com
report cve.org
report github.com