Vulnerability Description
GNU Emacs for Android improperly validates the table header input in sfnt_read_table_directory() in src/sfnt.c. Due to an incorrect comparison variable in the read-length check, a crafted font file that claims to contain more table directory entries than actually present causes the parser to return a struct with uninitialized heap memory in the table directory entries. 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 leads to the use of uninitialized heap data in subsequent table lookups, potentially resulting in information disclosure, crashes, or arbitrary memory access on 32-bit targets. This issue is fixed after commit 7621ee1d01229d50e5c0cddea6bf0b01095a62cf
Related Weaknesses (CWE)
References
- https://cert.pl/en/posts/2026/08/CVE-2026-71391
- https://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html
FAQ
What is CVE-2026-71394?
CVE-2026-71394 is a documented vulnerability. GNU Emacs for Android improperly validates the table header input in sfnt_read_table_directory() in src/sfnt.c. Due to an incorrect comparison variable in the read-length check, a crafted font file th...
How severe is CVE-2026-71394?
CVSS scoring is not yet available for CVE-2026-71394. Check NVD for updates.
Is there a patch for CVE-2026-71394?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.