CVE-2025-14822 json
DoS from quadratic complexity in model.ParseHashtags
published 2026-01-16 9 mo ago modified 2026-06-17 4 mo ago also GHSA-9r42-rhw3-2222 , GO-2026-4325 , EUVD-2026-2917
- cvss
- 3.1
- 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 28%
- public exploits
- 0
- none known
Summary
Mattermost versions 10.11.x <= 10.11.8 fail to validate input size before processing hashtags which allows an authenticated attacker to exhaust CPU resources via a single HTTP request containing a post with thousands space-separated tokens
Patch / fix
- go github.com/mattermost/mattermost-server 10.11.9, 10.11.9+incompatible, 11.2.0, 11.2.0+incompatible
- Mattermost Mattermost 10.11.9, 11.2.0
- govulncheck-vulndb openSUSE Leap 15.6 0.0.20260226T182644-150000.1.149.1
suse advisories SUSE-SU-2026:0757-1
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 9 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L |
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| GitHub | 3.1 | 3.1 | CVSS:3.1/AV:N/AC:H/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 | >=10.11.0, <10.11.9 >=11.0.0, <11.2.0 >=10.11.0+incompatible, <10.11.9+incompatible >=11.0.1+incompatible, <11.2.0+incompatible |
10.11.9 11.2.0 10.11.9+incompatible 11.2.0+incompatible |
Affected products
- Mattermost Mattermost
Classification
References
-
github.com
/mattermost/mattermost/commit/4d86263f5430d0eb991fc52ec886cf778cb072e6
web
-
github.com
/mattermost/mattermost/commit/b3d6c0c564c1a79e54e5105d0a8b60fc58a2bdee
web
-
mattermost.com
/security-updates
web, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2025-14822
advisory
-
github.com
/mattermost/mattermost
package
-
pkg.go.dev
/vuln/GO-2026-4325
web
-
github.com
/advisories/GHSA-9r42-rhw3-2222
advisory
Sources
- CVE List CVE-2025-14822
- GitHub Advisory GHSA-9r42-rhw3-2222
- NVD CVE-2025-14822
- OSV GO-2026-4325
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.