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{"bugzilla": {"description": "harfbuzz: HarfBuzz: Out-of-bounds write via crafted font in WebAssembly shaper", "id": "2556270", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2556270"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-787", "details": ["A flaw was found in HarfBuzz. An attacker can trigger an out-of-bounds write by enticing an application using the experimental WebAssembly (Wasm) shaper to process a specially crafted font. Due to an incorrect function signature in the glyph string conversion interface, the font's embedded WebAssembly module can write data past allocated buffer boundaries into host memory. This can lead to memory corruption, an application crash resulting in a Denial of Service (DoS), or potentially arbitrary code execution."], "mitigation": {"lang": "en:us", "value": "--- CME Mitigation Guidance (2026-10-20) ---\nDisclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure.\nThe highest-value action is to disable or compile out the experimental WebAssembly shaper in HarfBuzz builds to prevent executing font-embedded Wasm modules: upgrade to the fixed Harfbuzz builds, which update the native symbol signature to use integers, treat the buffer argument as a guest offset, and validate the full memory range using HB_ARRAY_PARAM before writing, closing all 2 injection vectors (crafted font file containing an embedded WebAssembly module, out-of-bounds guest offset call to font_glyph_to_string). Until patched, this is only a concern on applications and hosts running HarfBuzz compiled with the experimental WebAssembly shaper enabled (-Dwasm=enabled) \u2014 HarfBuzz installations built without the experimental WebAssembly shaper enabled are unaffected \u2014 so prevent target applications from loading untrusted or third-party font files and restrict user rendering of untrusted documents containing embedded fonts. As a compensating measure, enable Address Space Layout Randomization to randomize host process memory layout and hinder address targeting, compile host binaries with full RELRO and PIE to protect global offset table entries from being overwritten, enforce Control Flow Integrity and shadow call stacks to block unauthorized control-flow transfers if return addresses or pointers are corrupted, and enable Arbitrary Code Guard on Windows platforms to prevent allocating or converting writable memory into executable pages. These controls limit blast radius and contain exploitation, but they do not fix the underlying incorrect function signature defect \u2014 apply the upstream patch to fully remediate.\nHighest-impact CME: CME-1309 Script Engine Restriction (Sandbox / Disable) (high)"}, "name": "CVE-2026-113679", "package_state": [{"cpe": "cpe:/a:redhat:hummingbird:1", "fix_state": "Affected", "package_name": "harfbuzz", "product_name": "Red Hat Hardened Images"}], "public_date": "2026-10-20T15:40:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-113679\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-113679\nhttps://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-font.hh#L115-L123\nhttps://github.com/harfbuzz/harfbuzz/blob/14.6.0/src/hb-wasm-api-list.hh#L85\nhttps://github.com/harfbuzz/harfbuzz/commit/5e821de8256d01780566b5c8ab7886fae4c93da8\nhttps://github.com/harfbuzz/harfbuzz/pull/6414\nhttps://www.vulncheck.com/advisories/harfbuzz-8.0.0-through-14.6.0-out-of-bounds-write-via-webassembly-font-glyph-to-string"], "threat_severity": "Moderate"}

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