{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-12326: Memory safety bugs fixed in Firefox 152 and Thunderbird 152","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-12326","status":"final","version":"1","initial_release_date":"2026-06-16T11:52:59.767Z","current_release_date":"2026-06-16T16:08:45.204Z","revision_history":[{"date":"2026-06-16T11:52:59.767Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152 and Thunderbird 152.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-12326 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-12326"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-12326"},{"category":"external","summary":"Moderate Severity memory safety bugs fixed in Firefox 152 and Thunderbird 152","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=1767455%2C2004308%2C2024445%2C2028182%2C2029765%2C2029883%2C2030110%2C2030149%2C2030366%2C2030374%2C2030564%2C2031120%2C2033411%2C2038695%2C2042465%2C2042781%2C2042907"},{"category":"external","summary":"Low Severity memory safety bugs fixed in Firefox 152 and Thunderbird 152","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2021955%2C2025960%2C2029066%2C2029403%2C2029435%2C2029803%2C2030570%2C2030573%2C2032264%2C2033234%2C2034816%2C2035907%2C2035963%2C2036895%2C2036898%2C2036907%2C2036909%2C2036928%2C2036931%2C2036932%2C2036934%2C2039238%2C2039463"},{"category":"external","summary":"High Severity memory safety bugs fixed in Firefox 152 and Thunderbird 152","url":"https://bugzilla.mozilla.org/buglist.cgi?bug_id=2039050%2C2042718%2C2042760%2C2044831%2C2045307%2C2045398%2C2045516%2C2045572%2C2041741%2C2044433"},{"category":"external","summary":"mozilla.org","url":"https://www.mozilla.org/security/advisories/mfsa2026-57/"},{"category":"external","summary":"mozilla.org","url":"https://www.mozilla.org/security/advisories/mfsa2026-60/"}]},"product_tree":{"branches":[{"category":"vendor","name":"Mozilla","branches":[{"category":"product_name","name":"Firefox","branches":[{"category":"product_version","name":"*","product":{"name":"Mozilla Firefox *","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"152","product":{"name":"Mozilla Firefox 152","product_id":"CSAFPID-2","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*"}}}]}]},{"category":"vendor","name":"Mozilla","branches":[{"category":"product_name","name":"Thunderbird","branches":[{"category":"product_version","name":"*","product":{"name":"Mozilla Thunderbird *","product_id":"CSAFPID-3","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*"}}},{"category":"product_version","name":"152","product":{"name":"Mozilla Thunderbird 152","product_id":"CSAFPID-4","product_identification_helper":{"cpe":"cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-12326","title":"Memory safety bugs fixed in Firefox 152 and Thunderbird 152","notes":[{"category":"description","text":"Memory safety bugs present in Firefox 151 and Thunderbird 151. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 152 and Thunderbird 152.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1","CSAFPID-3"],"fixed":["CSAFPID-2","CSAFPID-4"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","baseScore":7.3,"baseSeverity":"HIGH"},"products":["CSAFPID-1","CSAFPID-3"]}],"remediations":[{"category":"vendor_fix","details":"Update to a fixed version: 152.","product_ids":["CSAFPID-1","CSAFPID-3"]}]}]}