Publish GHSA-m449-cwjh-6pw7

Author: advisory-database[bot]

advisories/github-reviewed/2025/11/GHSA-m449-cwjh-6pw7/GHSA-m449-cwjh-6pw7.json

@@ -0,0 +1,68 @@
+{
+  "schema_version": "1.4.0",
+  "id": "GHSA-m449-cwjh-6pw7",
+  "modified": "2025-11-24T22:42:07Z",
+  "published": "2025-11-24T22:42:07Z",
+  "aliases": [],
+  "summary": "pypdf's LZWDecode streams be manipulated to exhaust RAM",
+  "details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter.\n\nThis is a follow up to [GHSA-jfx9-29x2-rv3j](https://github.com/py-pdf/pypdf/security/advisories/GHSA-jfx9-29x2-rv3j) to align the default limit with the one for *zlib*.\n\n### Patches\nThis has been fixed in [pypdf==6.4.0](https://github.com/py-pdf/pypdf/releases/tag/6.4.0).\n\n### Workarounds\nIf users cannot upgrade yet, use the line below to overwrite the default in their code:\n\n```python\npypdf.filters.LZW_MAX_OUTPUT_LENGTH = 75_000_000\n```",
+  "severity": [
+    {
+      "type": "CVSS_V4",
+      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U"
+    }
+  ],
+  "affected": [
+    {
+      "package": {
+        "ecosystem": "PyPI",
+        "name": "pypdf"
+      },
+      "ranges": [
+        {
+          "type": "ECOSYSTEM",
+          "events": [
+            {
+              "introduced": "0"
+            },
+            {
+              "fixed": "6.4.0"
+            }
+          ]
+        }
+      ]
+    }
+  ],
+  "references": [
+    {
+      "type": "WEB",
+      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-jfx9-29x2-rv3j"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-m449-cwjh-6pw7"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/py-pdf/pypdf/commit/96186725e5e6f237129a58a97cd19204a9ce40b2"
+    },
+    {
+      "type": "PACKAGE",
+      "url": "https://github.com/py-pdf/pypdf"
+    },
+    {
+      "type": "WEB",
+      "url": "https://github.com/py-pdf/pypdf/releases/tag/6.4.0"
+    }
+  ],
+  "database_specific": {
+    "cwe_ids": [
+      "CWE-400",
+      "CWE-409"
+    ],
+    "severity": "MODERATE",
+    "github_reviewed": true,
+    "github_reviewed_at": "2025-11-24T22:42:07Z",
+    "nvd_published_at": null
+  }
+}