{"cve":"CVE-2022-3257","nvd":{"published":"2022-09-23T15:15:13.857","modified":"2026-06-17T04:59:10.270","status":"Modified","description":"Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":6.5},"cwes":["CWE-434","CWE-400"],"references":["https://hackerone.com/reports/1620170","https://mattermost.com/security-updates/","https://hackerone.com/reports/1620170","https://mattermost.com/security-updates/"],"products":["mattermost:mattermost_server"],"source":"nvd","synced_at":"2026-10-19T21:36:05.460296998+00:00"},"epss":{"cve":"CVE-2022-3257","score":0.0126,"percentile":0.69612,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-m7w4-q5vg-5xfp","url":"https://osv.dev/vulnerability/GHSA-m7w4-q5vg-5xfp","summary":"Mattermost subject to Denial of Service via upload of special GIF","modified":"2023-12-06T01:02:21.507277Z","packages":[{"ecosystem":"Go","name":"github.com/mattermost/mattermost-server/v6","purl":"pkg:golang/github.com/mattermost/mattermost-server/v6","ranges":[">=7.1.0 <7.2.0"],"fixed":["7.2.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}