{"id":"GHSA-9v8h-qqgm-4m35","title":"Brotli: Out-of-bounds write in the Brotli decoder (\"Node2Shell\") also affects the PyPI Brotli package","summary":"Brotli: Out-of-bounds write in the Brotli decoder (\"Node2Shell\") also affects the PyPI Brotli package","severity":"critical","cwe":["CWE-252"],"vendor":"brotli","product":"brotli","ecosystem":"pip","affected":["brotli >= 1.0.3, < 1.2.1","brotlicffi >= 1.0.3, < 1.2.1.0"],"patched":["brotli 1.2.1","brotlicffi 1.2.1.0"],"published":"2026-10-22","updated":"2026-10-23","sourceUpdated":"2026-10-23T19:08:11Z","source":"GHSA","sourceUrl":"https://github.com/advisories/GHSA-9v8h-qqgm-4m35","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111497"},{"url":"https://nodejs.org/en/blog/vulnerability/october-2026-security-releases#nodejs-brotli-decoder-out-of-bounds-write-permits-remote-code-execution-cve-2026-111497---high"},{"url":"https://github.com/google/brotli/commit/0ed4268a4401abcb4472096340477cf4af7d1a2b"},{"url":"https://github.com/google/brotli/commit/50a9b70a4d5e1443fc40927952276b68fffa83a0"},{"url":"https://github.com/google/brotli/commit/b418fa81c48262a86a95332b0bc6d62c30aa78b6"},{"url":"https://github.com/google/brotli/commit/da9806362874b9bd4b552a3af360b5d6347beb12"},{"url":"https://github.com/google/brotli/releases/tag/v1.0.10"},{"url":"https://github.com/google/brotli/releases/tag/v1.1.1"},{"url":"https://github.com/google/brotli/releases/tag/v1.2.1"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/brotli/PYSEC-2026-4322.yaml"},{"url":"https://github.com/pypa/advisory-database/tree/main/vulns/brotlicffi/PYSEC-2026-4323.yaml"},{"url":"https://nodejs.org/en/blog/vulnerability/october-2026-security-releases"},{"url":"https://opensourcemalware.com/blog/node2shell-affects-python"},{"url":"https://pypi.org/project/Brotli"},{"url":"https://pypi.org/project/brotlicffi"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-111497"},{"url":"https://github.com/advisories/GHSA-9v8h-qqgm-4m35"}],"tags":["ghsa","pip"],"ingestedAt":"2026-10-23T19:35:13.433Z","slug":"GHSA-9v8h-qqgm-4m35","body":"## Overview\n\nA buffer overflow vulnerability in the Brotli decoder (c/dec/decode.c) in Google Brotli versions 1.0.3 through 1.2.0 on all platforms allows a remote unauthenticated attacker to corrupt adjacent decoder state memory, disclose sensitive memory contents, cause a denial of service, or potentially execute arbitrary code using a crafted Brotli-compressed stream.\n\nUsers need to update any Brotli libraries or binaries between 1.0.3 through 1.2.0 to the latest available version: 1.0.10 or 1.1.1 or 1.2.1.\n\n## Affected packages\n\n- `brotli >= 1.0.3, < 1.2.1`\n- `brotlicffi >= 1.0.3, < 1.2.1.0`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `brotli 1.2.1`\n- `brotlicffi 1.2.1.0`","depth":"midnight","depthScore":52,"depthScoreParts":{"impact":52.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}