{"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-2026-67447 exists.","fix":"Upgrade github.com/axllent/mailpit to 1.30.5 or later.","what":"CVE-2026-67447 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-2026-67447 and fix it if it is affected.\n\nWhat it is: CVE-2026-67447 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-2026-67447 exists.\n\nAffected packages and fixed versions:\n- github.com/axllent/mailpit (Go): affected from 1.30.0; fixed in 1.30.5\n- github.com/axllent/mailpit (Go): affected from 1.30.0; fixed in 1.30.5\n- github.com/axllent/mailpit (Go): affected from 1.30.0; fixed in 1.30.5\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-2026-67447/ (Markdown: https://insights.sbomify.com/CVE-2026-67447/index.md)","id":"CVE-2026-67447","markdown":"https://insights.sbomify.com/CVE-2026-67447/index.md","name":"CVE-2026-67447","record":{"aliases":["GHSA-r553-m4fv-5v97","GO-2026-6272"],"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":"Unauthenticated attackers can cause memory exhaustion in Mailpit by sending oversized SMTP DATA lines before size limits are enforced.","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"}],"description":"Mailpit is an email testing tool and API for developers. From 1.30.0 until 1.30.5, Mailpit's internal/smtpd/smtpd.go readData() function calls bufio.Reader.ReadBytes before applying the len(data)+len(line) size check to the completed SMTP DATA line against Server.MaxSize. An unauthenticated SMTP client can send a single line larger than the configured MaxMessageSize, causing the full line to be allocated before Mailpit returns the 552 5.3.4 rejection. This post-fix gap remains after normal multi-line DATA accumulation was bounded, and concurrent oversized lines can create substantial memory pressure beyond the configured message-size cap. This issue is fixed in version 1.30.5.","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: SMTP DATA line reader buffers over-limit input before size enforcement","id":"CVE-2026-67447","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: WebSocket origin check bypass via percent-encoded path (regression of CVE-2026-22689)","id":"CVE-2026-67448"},"packages":[{"ecosystem":"Go","fixed":["1.30.5"],"introduced":["1.30.0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":null,"source":"GHSA-r553-m4fv-5v97"},{"ecosystem":"Go","fixed":["1.30.5"],"introduced":["1.30.0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","source":"GHSA-r553-m4fv-5v97"},{"ecosystem":"Go","fixed":["1.30.5"],"introduced":["1.30.0"],"last_affected":[],"package":"github.com/axllent/mailpit","purl":"pkg:golang/github.com/axllent/mailpit","source":"GO-2026-6272"}],"prev":{"headline":"Mailpit: Thumbnail generation decodes unbounded image dimensions before scaling","id":"CVE-2026-67446"},"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":"Unauthenticated attackers can cause memory exhaustion in Mailpit by sending oversized SMTP DATA lines before size limits are enforced.","url":"https://insights.sbomify.com/CVE-2026-67447/"}