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CVE-2026-19867

CVE.org · Published

Historical CVEsJSONAI instructions

Record status
Published
Identifier year (not publication year)
2026
Source publication
Source updated
Imported by cveboard
Source snapshot
cve_2026-10-24_midnight_baseline ·

Plain text

CNA source text (English)

Uncapped mention keys in user notification properties allow CPU exhaustion during post processing

Mattermost versions 11.10.x <= 11.10.0, 11.9.x <= 11.9.1, 11.8.x <= 11.8.5, 11.7.x <= 11.7.10 fail to cap the number and size of mention keys stored in a user's notification properties, and to bound the quadratic multibyte-keyword matching performed for each post, which allows an authenticated user to degrade post-processing latency and consume excessive CPU on behalf of other members of any channel they share via storing an oversized notify_props.mention_keys list on their own profile.. Mattermost Advisory ID: MMSA-2026-00773

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Mattermost

Vendor
Mattermost
Product
Mattermost
Platforms
Unknown
Default status
unaffected
Mattermost · Scoped product and version facts
Version (version)Status (status)Version scheme (versionType)Exclusive end (lessThan)Inclusive end (lessThanOrEqual)Status changes (at → status)
11.10.0affectedsemverUnavailable11.10.0None listed
11.9.0affectedsemverUnavailable11.9.1None listed
11.8.0affectedsemverUnavailable11.8.5None listed
11.7.0affectedsemverUnavailable11.7.10None listed
11.11.0unaffectedUnavailableUnavailableUnavailableNone listed
11.10.1unaffectedUnavailableUnavailableUnavailableNone listed
11.9.2unaffectedUnavailableUnavailableUnavailableNone listed
11.8.6unaffectedUnavailableUnavailableUnavailableNone listed
11.7.11unaffectedUnavailableUnavailableUnavailableNone listed