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Muhammara is a node module with c/cpp bindings to modify PDF with JavaScript for node or electron. Prior to 6.0.5, Muhammara PDFParser::CreateFilterForStream() in src/deps/PDFWriter/PDFParser.cpp dereferences a null PDFInteger pointer when a PDF stream uses the LZWDecode filter with a DecodeParms dictionary that omits the EarlyChange key. An application that processes an untrusted PDF and reads the affected stream can crash, causing a denial of service. This issue is fixed in version 6.0.5.
Read the publisher's advisoryMuhammara is a node module with c/cpp bindings to modify PDF with JavaScript for node or electron. Prior to 6.0.5, Muhammara PDFParser::CreateFilterForStream() in src/deps/PDFWriter/PDFParser.cpp dereferences a null PDFInteger pointer when a PDF stream uses the LZWDecode filter with a DecodeParms dictionary that omits the EarlyChange key. An application that processes an untrusted PDF and reads the affected stream can crash, causing a denial of service. This issue is fixed in version 6.0.5.
Read the publisher's advisoryMuhammara is a node module with c/cpp bindings to modify PDF with JavaScript for node or electron. Prior to 6.0.5, Muhammara PDFParser::CreateFilterForStream() in src/deps/PDFWriter/PDFParser.cpp dereferences a null PDFInteger pointer when a PDF stream uses the LZWDecode filter with a DecodeParms dictionary that omits the EarlyChange key. An application that processes an untrusted PDF and reads the affected stream can crash, causing a denial of service. This issue is fixed in version 6.0.5.
Read the publisher's advisory## Summary A NULL pointer dereference vulnerability exists in `PDFParser::CreateFilterForStream()` when processing a PDF stream with `/Filter /LZWDecode` and a `/DecodeParms` dictionary that does not contain the `EarlyChange` key. This causes an access violation (0xC0000005) and crashes the process. ## Affected Version muhammara <= 6.0.4 (latest) ## Vulnerability Details **File:** `src/deps/PDFWriter/PDFParser.cpp` line 2107 ```cpp if (inDecodeParams) { PDFObjectCastPtr<PDFInteger> earlyObj( QueryDictionaryObject(inDecodeParams, "EarlyChange") ); early = earlyObj->GetValue(); // NULL dereference when EarlyChange key is absent } ``` When `inDecodeParams` is non-NULL but lacks the `EarlyChange` key: 1. `QueryDictionaryObject()` returns NULL 2. `PDFObjectCastPtr<PDFInteger>(NULL)` wraps NULL 3. `earlyObj->GetValue()` dereferences NULL → crash ## PoC 460-byte malicious PDF triggers crash via `startReadingFromStream()`: - PDF contains `/Filter /LZWDecode` with `/DecodeParms << >>` (empty, no EarlyChange) - Exit code: `0xC0000005` (Access Violation) ## Fix ```cpp if (earlyObj) early = earlyObj->GetValue(); ``` ## Impact Any application accepting untrusted PDFs and using muhammara to read stream contents is vulnerable to DoS. Similar to: CVE-2022-41957, CVE-2022-39381 ## PoC File [poc_muhammara_lzw_null.js](https://github.com/user-attachments/files/27186113/poc_muhammara_lzw_null.js)
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Shown as published. These rules are not interpreted as NuGet package version ranges.
{
"vendor": "julianhille",
"product": "MuhammaraJS",
"versions": [
{
"version": "< 6.0.5",
"status": "affected"
}
]
}Original source record · Cite this exact observation · Complete original publisher JSON
EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.
datePublished: Nov 9, 2026, 9:29:35 PM
dateUpdated: Nov 10, 2026, 4:13:16 PM
No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.
Original source record · Cite this exact observation · Complete original publisher JSON
NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.
Source analysis status: Deferred
Weakness classifications: CWE-476
published: 2026-11-09T22:18:41.813
lastModified: 2026-11-12T22:18:51.470
No normalized affected-package data is projected for this source revision. The original publisher record may contain additional product and version evidence; this does not establish that a package is unaffected.
Original source record · Cite this exact observation · Complete original publisher JSON
npm
SEMVER · introduced 0 → fixed 6.0.5
Original source record · Cite this exact observation · Complete original publisher JSON