{"schemaVersion":3,"id":"CVE-2026-71393","aliases":["UBUNTU-CVE-2026-71393","DEBIAN-CVE-2026-71393"],"status":"published","duplicateOf":null,"title":null,"description":"GNU Emacs for Android is vulnerable to an integer overflow in sfnt_read_name_table() in src/sfnt.c. The function computes an allocation size using a 32-bit length value from a TrueType font file without overflow checking. On 32-bit targets, a crafted font causes the calculation to wrap, resulting in an undersized heap allocation. A subsequent read() call writes beyond the buffer, causing a heap buffer overflow. An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it. This can lead to heap memory corruption and potential code execution.\n\n\n\n\nThis issue was fixed in commit d51a4722316efe0960994d371e1859099894d1ca","dates":{"published":"2026-08-10T10:22:37.299Z","modified":"2026-08-10T17:50:19.871Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.3,"severity":"medium","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:L/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":5.3,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:L/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · 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This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"vendor":"debian","product":"emacs","name":"emacs","label":"emacs","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/emacs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"emacs","name":"emacs","label":"emacs","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/emacs","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"emacs24","name":"emacs24","label":"emacs24","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/emacs24","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"emacs25","name":"emacs25","label":"emacs25","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/emacs25","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xemacs21","name":"xemacs21","label":"xemacs21","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xemacs21","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xemacs21-packages","name":"xemacs21-packages","label":"xemacs21-packages","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xemacs21-packages","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"gnu","product":"emacs","name":"Emacs","label":"emacs","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 30.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 30.2","eol":null,"hubHref":"/vendor/gnu/emacs"}],"affectedCount":7,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://cert.pl/en/posts/2026/08/CVE-2026-71391","label":"cert.pl/en/posts/2026/08/CVE-2026-71391","hostname":"cert.pl","tags":["Third Party Advisory","REPORT"]},{"url":"https://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html","label":"www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html","hostname":"www.gnu.org","tags":["Product","REPORT"]},{"url":"https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=d51a4722316efe0960994d371e1859099894d1ca","label":"git.savannah.gnu.org/cgit/emacs.git/commit/?id=d51a4722316efe0960994d371e1859099894d1ca","hostname":"git.savannah.gnu.org","tags":["Patch","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-71393","label":"ubuntu.com/security/CVE-2026-71393","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-71393","label":"www.cve.org/CVERecord?id=CVE-2026-71393","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-71393","label":"security-tracker.debian.org/tracker/CVE-2026-71393","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-08-10T10:22:37.299Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-10T17:50:19.871Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":21,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T13:40:40.733Z","stale":false,"partial":false}}