{"answers":{"affected":"14 open source packages ship an affected version, including github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server/v5 and github.com/mattermost/mattermost-server/v6. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-25780 in the wild and no public exploit code.","fix":"Upgrade github.com/mattermost/mattermost-server to a fixed version for your release line: 5.3.2-0.20260123215601-86797c508c44, 10.11.11, 10.11.11+incompatible or 11.2.3+incompatible.","what":"CVE-2026-25780 is a medium-severity denial of service vulnerability in Mattermost Mattermost Server, published on 16 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-25780 and fix it if it is affected.\n\nWhat it is: CVE-2026-25780 is a medium-severity denial of service vulnerability in Mattermost Mattermost Server, published on 16 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-25780 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- github.com/mattermost/mattermost-server (Go): affected all versions; fixed in 5.3.2-0.20260123215601-86797c508c44\n- github.com/mattermost/mattermost-server (Go): affected all versions; fixed in 5.3.2-0.20260123215601-86797c508c44\n- github.com/mattermost/mattermost-server (Go): affected from 10.11.0-rc1; fixed in 10.11.11\n- github.com/mattermost/mattermost-server (Go): affected from 10.11.0-rc1; fixed in 10.11.11\n- github.com/mattermost/mattermost-server (Go): affected from 10.11.0-rc1+incompatible; fixed in 10.11.11+incompatible, 11.2.3+incompatible, 11.3.1+incompatible\n- github.com/mattermost/mattermost-server (Go): affected from 11.2.0-rc1; fixed in 11.2.3\n- github.com/mattermost/mattermost-server (Go): affected from 11.2.0-rc1; fixed in 11.2.3\n- github.com/mattermost/mattermost-server (Go): affected from 11.3.0-rc1; fixed in 11.3.1\n- github.com/mattermost/mattermost-server (Go): affected from 11.3.0-rc1; fixed in 11.3.1\n- github.com/mattermost/mattermost-server/v5 (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost-server/v6 (Go): affected all versions; no fix listed\n- github.com/mattermost/mattermost/server/v8 (Go): affected all versions; fixed in 8.0.0-20260123215601-86797c508c44\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-2026-25780/ (Markdown: https://insights.sbomify.com/CVE-2026-25780/index.md)","id":"CVE-2026-25780","markdown":"https://insights.sbomify.com/CVE-2026-25780/index.md","name":"CVE-2026-25780","record":{"aliases":["GHSA-xv2p-wchj-qjhp","GO-2026-4733"],"analysis":{"component_type":"web_application","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Mattermost collaboration platform","requires_auth":"low_privilege","summary":"An authenticated attacker can cause server memory exhaustion and denial of service by uploading a specially crafted DOC file to Mattermost.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Mattermost","cpe":[{"product":"mattermost_server","vendor":"mattermost"}],"cvss":{"score":4.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-789","name":"Memory Allocation with Excessive Size Value"}],"description":"Mattermost versions 11.3.x \u003c= 11.3.0, 11.2.x \u003c= 11.2.2, 10.11.x \u003c= 10.11.10 fail to bound memory allocation when processing DOC files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted DOC file.. Mattermost Advisory ID: MMSA-2026-00581","ecosystems":["Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Memory Exhaustion via Malformed DOC File Upload","id":"CVE-2026-25780","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Go","product":"mattermost:mattermost_server","products":["mattermost:mattermost_server"],"type":"denial_of_service","year":"2026"},"n_packages":14,"n_references":1,"next":{"headline":"kernel_liteos_a has an out-of-bounds write vulnerability","id":"CVE-2026-25781"},"packages":[{"ecosystem":"Go","fixed":["5.3.2-0.20260123215601-86797c508c44"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["5.3.2-0.20260123215601-86797c508c44"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["10.11.11"],"introduced":["10.11.0-rc1"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["10.11.11"],"introduced":["10.11.0-rc1"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["10.11.11+incompatible","11.2.3+incompatible","11.3.1+incompatible"],"introduced":["10.11.0-rc1+incompatible","11.2.0-rc1+incompatible","11.3.0-rc1+incompatible"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GO-2026-4733"},{"ecosystem":"Go","fixed":["11.2.3"],"introduced":["11.2.0-rc1"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["11.2.3"],"introduced":["11.2.0-rc1"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["11.3.1"],"introduced":["11.3.0-rc1"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":null,"source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["11.3.1"],"introduced":["11.3.0-rc1"],"last_affected":[],"package":"github.com/mattermost/mattermost-server","purl":"pkg:golang/github.com/mattermost/mattermost-server","source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v5","purl":"pkg:golang/github.com/mattermost/mattermost-server/v5","source":"GO-2026-4733"},{"ecosystem":"Go","fixed":[],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","source":"GO-2026-4733"},{"ecosystem":"Go","fixed":["8.0.0-20260123215601-86797c508c44"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":null,"source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["8.0.0-20260123215601-86797c508c44"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GHSA-xv2p-wchj-qjhp"},{"ecosystem":"Go","fixed":["8.0.0-20260123215601-86797c508c44"],"introduced":["0"],"last_affected":[],"package":"github.com/mattermost/mattermost/server/v8","purl":"pkg:golang/github.com/mattermost/mattermost/server/v8","source":"GO-2026-4733"}],"prev":{"headline":"Gitea redirect handling permits open redirects through backslash paths","id":"CVE-2026-25779"},"products":["Mattermost"],"published":"2026-03-16","related":[{"cvss_score":9.9,"headline":"Account takeover on OAuth/OpenID-enabled servers","id":"CVE-2025-12419","kev_date_added":null,"published":"2025-11-27"},{"cvss_score":9.9,"headline":"Account Takeover via Code Exchange Endpoint","id":"CVE-2025-12421","kev_date_added":null,"published":"2025-11-27"},{"cvss_score":9.9,"headline":"Path Traversal Leading to RCE by Any Authenticated Mattermost User","id":"CVE-2025-4981","kev_date_added":null,"published":"2025-06-20"},{"cvss_score":9.9,"headline":"Arbitrary file read via block duplication in Mattermost Boards","id":"CVE-2025-20051","kev_date_added":null,"published":"2025-02-24"},{"cvss_score":9.9,"headline":"Arbitrary file read in Mattermost Boards via import \u0026 export board archive","id":"CVE-2025-25279","kev_date_added":null,"published":"2025-02-24"},{"cvss_score":9.8,"headline":"Mattermost Server: Insufficient Password-Reset Link Invalidation","id":"CVE-2016-11074","kev_date_added":null,"published":"2020-06-19"},{"cvss_score":9.8,"headline":"Mattermost Server allows attackers to gain privileges by accessing unintended API endpoints with users' credentials","id":"CVE-2017-18885","kev_date_added":null,"published":"2020-06-19"}],"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":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-16","vendors":["Mattermost"]},"summary":"An authenticated attacker can cause server memory exhaustion and denial of service by uploading a specially crafted DOC file to Mattermost.","url":"https://insights.sbomify.com/CVE-2026-25780/"}