CVE-2026-90557

Crash and heap disclosure via unchecked activity index

Published Sep 12, 2026 · Updated Sep 12, 2026

Out-of-bounds read in Freeciv 3.1.0 through 3.2.5 allows attackers to crash the game or expose limited heap data via a savegame file. The sg_load_player_unit() function uses an invalid unit activity index to access activities.order[] without first validating the array bound. Exploitation requires the crafted savegame to be loaded, after which the process can crash or disclose adjacent heap contents.

CVSS severityUnavailable
Unscored
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Out-of-bounds read in Freeciv 3.1.0 through 3.2.5 allows attackers to crash the game or expose limited heap data via a savegame file. The sg_load_player_unit() function uses an invalid unit activity index to access activities.order[] without first validating the array bound. Exploitation requires the crafted savegame to be loaded, after which the process can crash or disclose adjacent heap contents.

The record

CVE
CVE-2026-90557
Published
Sep 12, 2026
Updated
Sep 12, 2026
Vendor
Freeciv
Product
Freeciv
Classifications
T1204.002
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.0 <3.2.6

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Freeciv · Freecivversion=3.1.0 <3.2.6

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1204.002Malicious File

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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