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Fencer Vulns
medium 4.3

CVE-2026-25780 json

Memory Exhaustion via Malformed DOC File Upload

published 2026-03-16 7 mo ago modified 2026-06-17 4 mo ago also GHSA-xv2p-wchj-qjhp , GO-2026-4733 , EUVD-2026-12430

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when processing DOC files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted DOC file.. Mattermost Advisory ID: MMSA-2026-00581

Patch / fix

  • go github.com/mattermost/mattermost/server/v8 8.0.0-20260123215601-86797c508c44
  • go github.com/mattermost/mattermost-server 5.3.2-0.20260123215601-86797c508c44, 10.11.11, 10.11.11+incompatible, 11.2.3, 11.2.3+incompatible, 11.3.1, 11.3.1+incompatible
  • Mattermost Mattermost 10.11.11, 11.2.3, 11.3.1, 11.4.0
  • govulncheck-vulndb openSUSE Leap 15.6 0.0.20260326T203309-150000.1.155.2

suse advisories SUSE-SU-2026:1135-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-25780 updated cvss 4.3

github.com/mattermost/mattermost-server: Memory Exhaustion via Malformed DOC File Upload

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

Affected packages

ecosystem package affected fixed in
go github.com/mattermost/mattermost/server/v8
<8.0.0-20260123215601-86797c508c44
8.0.0-20260123215601-86797c508c44
go github.com/mattermost/mattermost-server
<5.3.2-0.20260123215601-86797c508c44
>=10.11.0-rc1, <10.11.11
>=11.2.0-rc1, <11.2.3
>=11.3.0-rc1, <11.3.1
>=10.11.0-rc1+incompatible, <10.11.11+incompatible
>=11.2.0-rc1+incompatible, <11.2.3+incompatible
>=11.3.0-rc1+incompatible, <11.3.1+incompatible
5.3.2-0.20260123215601-86797c508c44
10.11.11
11.2.3
11.3.1
10.11.11+incompatible
11.2.3+incompatible
11.3.1+incompatible
go github.com/mattermost/mattermost-server/v5
all versions
 no fix listed
go github.com/mattermost/mattermost-server/v6
all versions
 no fix listed

Affected products

  • Mattermost Mattermost

Classification

Weakness
  • CWE-789 Memory Allocation with Excessive Size Value

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.