CVE-2026-71391

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{"bugzilla": {"description": "emacs: off-by-one error via a malicious font file", "id": "2513076", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513076"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-193", "details": ["GNU Emacs for Android contains an off-by-one error in the gvar table parser in src/sfnt.c. The shared-coordinate index boundary check in sfnt_vary_simple_glyph() and sfnt_vary_compound_glyph() uses a strict greater-than comparison instead of greater-than-or-equal, allowing a crafted TrueType variable font to bypass the check and trigger a heap-based out-of-bounds read via memcpy. An attacker can deliver a malicious font file via email, EWW (Emacs Web Wowser), or documents with custom faces, causing Emacs to load it.\u00a0This exposes heap memory contents which can be later used to defeat ASLR.\nThis issue was fixed in commit\u00a095ab9ef627b212d74d321c5bbb5b56a1be7b9fbe", "A flaw was found in GNU Emacs for Android. An off-by-one error in the gvar table parser allows a remote attacker to deliver a specially crafted TrueType variable font. This can bypass a boundary check, leading to a heap-based out-of-bounds read. Successful exploitation exposes heap memory contents, which could be used to defeat Address Space Layout Randomization (ASLR) and potentially lead to further attacks."], "name": "CVE-2026-71391", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "emacs", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-10T10:22:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-71391\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-71391\nhttps://cert.pl/en/posts/2026/08/CVE-2026-71391\nhttps://git.savannah.gnu.org/cgit/emacs.git/commit/?id=95ab9ef627b212d74d321c5bbb5b56a1be7b9fbe\nhttps://www.gnu.org/savannah-checkouts/gnu/emacs/emacs.html"], "threat_severity": "Low"}

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