Medium [CVE-2026-71394] use of uninitialized memory via a malicious font file
This medium-severity Red Hat Linux advisory covers CVE-2026-71394.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
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 To exploit this flaw, a user needs to load a malicious font file or a document with custom faces, limiting its exposure. For these reasons, this vulnerability has been rated with a moderate severity.
Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). Weakness: CWE-1284.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
Mitigation checklist
- Do not load untrusted font files or open unverified documents with custom faces.
Official advisory · high-confidence parse· fetched 2 days ago·verify at source
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