{"schemaVersion":3,"id":"CVE-2026-71392","aliases":["UBUNTU-CVE-2026-71392","DEBIAN-CVE-2026-71392"],"status":"published","duplicateOf":null,"title":null,"description":"GNU Emacs for Android is vulnerable to an integer overflow in the sfnt_read_cmap_format_12() function in src/sfnt.c. When processing a crafted TrueType font file, an unguarded addition in the xmalloc allocation call wraps around on 32-bit builds, causing a heap buffer overflow write. 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 results in heap memory corruption that can lead to code execution.\n\n\nThis issue was fixed in commit c4e20777c26548722a37b03db93243e83a0d6188","dates":{"published":"2026-08-10T10:22:26.135Z","modified":"2026-08-10T17:48:56.986Z","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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Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. 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=c4e20777c26548722a37b03db93243e83a0d6188","label":"git.savannah.gnu.org/cgit/emacs.git/commit/?id=c4e20777c26548722a37b03db93243e83a0d6188","hostname":"git.savannah.gnu.org","tags":["Patch","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-71392","label":"ubuntu.com/security/CVE-2026-71392","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-71392","label":"www.cve.org/CVERecord?id=CVE-2026-71392","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-71392","label":"security-tracker.debian.org/tracker/CVE-2026-71392","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-08-10T10:22:26.135Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-10T17:48:56.986Z","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":"2026-10-21T09:12:39.986Z","stale":false,"partial":false}}