CVE-2026-54633 PoDoFo: Heap Out-of-Bounds Read in Indexed Color Space Image Decoding (FetchScanLine)
A heap out-of-bounds read in PoDoFo allows attackers to disclose adjacent heap data or crash the application via a crafted PDF.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-54633?
CVE-2026-54633 is a medium-severity vulnerability in podofo, published on 17 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
PoDoFo is a C++17 PDF manipulation library. From version 1.0.0 until 1.1.1, processing a crafted PDF with an Indexed color-space image can cause a heap out-of-bounds read in PdfColorSpaceFilterIndexed::FetchScanLine in src/podofo/main/PdfColorSpaceFilter.cpp. PODOFO_INVARIANT does not perform a runtime check, so a pixel index greater than or equal to m_MapSize can address beyond m_lookup. PdfColorSpaceFilterFactory::TryCreateFromObject also validates hival with an incorrect conjunction and no upper bound, allowing malformed Indexed color-space metadata outside the expected range. The resulting read can disclose adjacent heap data or crash the processing application. This issue is fixed in version 1.1.1.
Weakness: CWE-125
Which versions are affected by CVE-2026-54633?
How do I fix CVE-2026-54633?
No fix has been published for CVE-2026-54633 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-54633 being exploited?
There is no known exploitation of CVE-2026-54633 in the wild and no public exploit code.
Sources
Also known as GHSA-f3j2-7846-h5gg, UBUNTU-CVE-2026-54633.