{"answers":{"affected":"3 open source packages ship an affected version, including github.com/axllent/mailpit.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67446 exists.","fix":"Upgrade github.com/axllent/mailpit to 1.30.4 or later.","what":"CVE-2026-67446 is a medium-severity denial of service vulnerability in axllent mailpit, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-67446 and fix it if it is affected.\n\nWhat it is: CVE-2026-67446 is a medium-severity denial of service vulnerability in axllent mailpit, published on 20 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67446 exists.\n\nAffected packages and fixed versions:\n- github.com/axllent/mailpit (Go): affected all versions; fixed in 1.30.4\n- github.com/axllent/mailpit (Go): affected all versions; fixed in 1.30.4\n- github.com/axllent/mailpit (Go): affected all versions; fixed in 1.30.4\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-67446/ (Markdown: https://insights.sbomify.com/CVE-2026-67446/index.md)","id":"CVE-2026-67446","markdown":"https://insights.sbomify.com/CVE-2026-67446/index.md","name":"CVE-2026-67446","record":{"aliases":["GHSA-75mr-qw9x-3r39","GO-2026-6359"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Email testing tool","requires_auth":"none","summary":"An attacker can cause denial of service by uploading crafted image attachments that consume excessive memory and CPU during thumbnail generation.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"Mailpit is an email testing tool and API for developers. Prior to 1.30.4, Mailpit decodes attacker-supplied image attachments into a full raster before checking decoded dimensions, pixel count, or memory use in the GET /api/v1/message/{id}/part/{partID}/thumb endpoint. The Thumbnail handler in server/apiv1/thumbnails.go obtains attachment bytes through storage.GetAttachmentPart(), accepts image/* content, and calls imaging.Decode() with AutoOrientation before imaging.Fill() scales the image to 180 by 120 pixels. A compact image declaring very large dimensions can therefore consume disproportionately large memory and CPU, and opening the message UI can trigger the same endpoint through server/ui-src/components/message/MessageAttachments.vue. This can degrade availability when an unauthenticated client can store the crafted attachment and reach the web API. This issue is fixed in version 1.30.4.","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling","id":"CVE-2026-67446","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Mailpit: SMTP DATA line reader buffers over-limit input before size enforcement","id":"CVE-2026-67447"},"packages":[{"ecosystem":"Go","fixed":["1.30.4"],"introduced":["0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":null,"source":"GHSA-75mr-qw9x-3r39"},{"ecosystem":"Go","fixed":["1.30.4"],"introduced":["0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","source":"GHSA-75mr-qw9x-3r39"},{"ecosystem":"Go","fixed":["1.30.4"],"introduced":["0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","source":"GO-2026-6359"}],"prev":{"headline":"Mailpit: SMTP command parser buffers unbounded command lines before syntax rejection","id":"CVE-2026-67445"},"products":["mailpit"],"published":"2026-08-20","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-21","vendors":["axllent"]},"summary":"An attacker can cause denial of service by uploading crafted image attachments that consume excessive memory and CPU during thumbnail generation.","url":"https://insights.sbomify.com/CVE-2026-67446/"}