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CVE-2026-90556

Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load

8.5 HighFix available

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.20%Up 0.1 points since Sep 14, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.5

Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
CVE-2026-90556
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
EUVDEUVD-2026-76901 8.5

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
EUVD-2026-76901
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-2p7g-gcvc-7p6m 8.5

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing...

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
GHSA-2p7g-gcvc-7p6m
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
NVD 8.5

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
CVE-2026-90556
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-122
Updated
2026-11-02
OSV 8.5

Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
CVE-2026-90556
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness
CWE-122
Updated
2026-11-02
OSVDEBIAN-CVE-2026-90556 8.5

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
DEBIAN-CVE-2026-90556
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-90556 8.5

Freeciv versions before 3.2.6 contain a heap buffer overflow in worklist_load() when processing savegame files with declared worklist lengths exceeding the fixed array bound of 64 elements. Attackers can craft malicious savegame files that write past the entries array into adjacent heap-allocated struct fields, potentially corrupting memory when a user or server operator loads the file.

Record
UBUNTU-CVE-2026-90556
CVSS 4.0
8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated
2026-11-02
OSVMGASA-2026-0505 No score

Updated freeciv package fixes security vulnerabilities

Freeciv before 3.2.6 Heap Buffer Overflow via worklist_load. (CVE-2026-90556) Freeciv 3.1.0 through 3.2.5 Out-of-Bounds Read via Savegame. (CVE-2026-90557)

Record
MGASA-2026-0505
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
freeciv
Debian:12
All versions, plus listed versions
3.0.6-13.0.6-1+deb12u13.0.8-13.0.8-23.1.0+ds-1
Show 13 moreShow less
3.1.1+ds-13.1.2+ds-13.1.2+ds-23.1.2+ds-2~exp13.1.4+ds-13.1.4+ds-23.2.0+ds-13.2.1+ds-13.2.1+ds-23.2.2+ds-13.2.4+ds-13.2.5+ds-13.2.6+ds-1
None known
freeciv
Debian:13
All versions, plus listed versions
3.1.4+ds-23.1.4+ds-2+deb13u13.2.0+ds-13.2.1+ds-13.2.1+ds-2
Show 4 moreShow less
3.2.2+ds-13.2.4+ds-13.2.5+ds-13.2.6+ds-1
None known
freeciv
Debian:14
before 3.2.6+ds-1, plus listed versions
3.1.4+ds-23.2.0+ds-13.2.1+ds-13.2.1+ds-23.2.2+ds-13.2.4+ds-13.2.5+ds-1
3.2.6+ds-1
freeciv
Mageia:10
From an advisory covering 2 CVEs
before 3.2.6-1.mga10
3.2.6-1.mga10
freeciv
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
2.5.1-12.5.2-12.5.3-12.5.3-1ubuntu0.1~esm1
None known
freeciv
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
2.5.9-12.5.10-12.5.10-1ubuntu0.1~esm1
None known
freeciv
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
2.6.0-32.6.0-42.6.1-12.6.2-12.6.2-1ubuntu0.1~esm1
None known
freeciv
Ubuntu:Pro:22.04:LTS
All versions, plus listed versions
2.6.3-12.6.5-12.6.6-12.6.6-1ubuntu0.1~esm1
None known
freeciv
Ubuntu:Pro:24.04:LTS
All versions, plus listed versions
3.0.8-13.0.8-23.0.8-2build13.1.0+ds-1build33.1.0+ds-1build43.1.0+ds-1build53.1.0+ds-1ubuntu0.1~esm1
None known
freeciv
Ubuntu:26.04:LTS
All versions, plus listed versions
3.2.0+ds-13.2.1+ds-13.2.1+ds-1build13.2.2+ds-13.2.4+ds-1
None known

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-90556 is a high vulnerability (CVSS 8.5) in Freeciv, published September 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. Fixed in freeciv 3.2.6+ds-1.

References

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