GHSA-xg43-5579-qw6v is a medium-severity (CVSS 6.5) remote code execution vulnerability in adawolfa/isdoc. O3 Security confirms whether GHSA-xg43-5579-qw6v is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.
adawolfa/isdoc: Uncontrolled resource consumption (decompression bomb) when reading untrusted ISDOCX or PDF files
Real-World Exposure
adawolfa/isdoc🐘adawolfa/isdoc🐘adawolfa/isdoc🐘adawolfa/isdocReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Impact
adawolfa/isdoc reads ISDOC invoices from ISDOCX (ZIP) archives and from PDF files with embedded ISDOC documents and supplements. Affected versions inflate ZIP entries and read embedded files without validating their uncompressed size, so a small crafted file can amplify into gigabytes:
- ISDOCX decompression bomb —
getFromName()inflates the ISDOC document and binary supplements with no size cap. saveTo()disk-fill — the supplement copy loop writes inflated bytes to disk with no running byte budget, so a bomb can exhaust disk even if the central-directory size is under-reported.- PDF embedded files — an embedded file whose declared
Lengthis enormous is read and digested with no upper bound.
Exploitation requires the application to parse an attacker-supplied .isdocx or .pdf (the typical use is generating files or parsing files from trusted vendors, so a user must be induced to process a malicious file). When that happens the process can be driven to exhaust memory or disk, causing denial of service. There is no confidentiality or integrity impact — availability only.
Patches
Fixed in 1.4.3, 1.5.1, 1.6.1 and 2.0.0. The readers now:
- read the uncompressed size from the ZIP central directory (
statName()) and reject entries over a cap before inflating — 256 KB (DocumentSizeLimit) for the ISDOC document, 32 MB (SizeLimit) for supplements; - enforce a running byte budget in
saveTo()and unlink the partial file on overflow; - reject PDF-embedded files whose declared
Lengthexceeds 256 MB before reading or digesting them.
New exceptions ReaderException::zipEntryTooLarge(), SupplementException::supplementTooLarge() and ReaderException::pdfSupplementTooLarge() surface the rejection.
Unsupported versions
Versions before 1.4.0 (the 1.0–1.3 lines) are also affected and will not receive a fix, because they target end-of-life PHP. Users on those lines should upgrade to a maintained release — 1.4.3, 1.5.1, 1.6.1, or 2.0.0.
Workarounds
No code-level workaround exists in affected versions; upgrading is the fix. As mitigation, restrict parsing to trusted input, or enforce an external size / decompression limit (validate ZIP entry sizes, cap process memory) before handing files to the library.
Resources
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | adawolfa/isdoc | ≥ 1.6.0&&< 1.6.1 | 1.6.1 |
| 🐘Packagist | adawolfa/isdoc | ≥ 1.5.0&&< 1.5.1 | 1.5.1 |
| 🐘Packagist | adawolfa/isdoc | ≥ 1.4.0&&< 1.4.3 | 1.4.3 |
| 🐘Packagist | adawolfa/isdoc | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for adawolfa/isdoc. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
Update adawolfa/isdoc to 1.6.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xg43-5579-qw6v is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 pinpoints whether GHSA-xg43-5579-qw6v is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.
Tailored to GHSA-xg43-5579-qw6v. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Frequently Asked Questions
Is GHSA-xg43-5579-qw6v in your dependencies?
O3 detects GHSA-xg43-5579-qw6v across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.