Silent loss of messages when merging overlapping chat exports in whatstk
Summary
| CVE | CVE-2026-121564 |
|---|---|
| State | PUBLISHED |
| Assigner | Secur0 |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-03 16:17:29 UTC |
| Updated | 2026-11-03 16:30:49 UTC |
| Description | Incomplete Comparison with Missing Factors (CWE-1023) in merge_chats() (whatstk/utils/chat_merge.py), reached from BaseChat.merge(), in whatstk from 0.3.0 before 0.9.0 allows a party that supplies the chat exports to cause messages to be absent from the merged output with no indication that anything was removed, because the merge keeps whole the chat whose first message is oldest and appends from the other only the messages that are strictly newer than the last message of the first. Every message of the second chat that falls inside the date range already covered by the first is therefore discarded. The two chats are compared on their date ranges and not on the identity of the individual messages, so a message held by only one of the two exports is dropped whenever its date falls inside the range of the other, and both branches of _merge_two_chats() behave this way. The merged result is returned without a warning and without a count of what was removed. This results in a merged chat that omits messages the inputs contain, in a library whose documented uses include forensic review and the generation of training data. |
Risk And Classification
Primary CVSS: v4.0 1.8 LOW from 4daa8cea-433a-44bd-9456-53b127fc289a
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/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
Problem Types: CWE-1023 | CWE-1023 CWE-1023 Incomplete Comparison with Missing Factors
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | 4daa8cea-433a-44bd-9456-53b127fc289a | Secondary | 1.8 | LOW | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/C... |
| 4.0 | CNA | CVSS | 1.8 | LOW | CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N |
CVSS v4.0 Breakdown
Attack Vector
LocalAttack Complexity
LowAttack Requirements
PresentPrivileges Required
NoneUser Interaction
ActiveConfidentiality
NoneIntegrity
LowAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/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
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Lucasrodes | Whatstk | affected 0.3.0 0.9.0 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/lucasrodes/whatstk/pull/185 | 4daa8cea-433a-44bd-9456-53b127fc289a | github.com | |
| github.com/lucasrodes/whatstk/releases/tag/v0.9.0 | 4daa8cea-433a-44bd-9456-53b127fc289a | github.com | |
| secur0.com/en/cna/cve-list/cve-2026-121564-whatstk-merge-message-loss | 4daa8cea-433a-44bd-9456-53b127fc289a | secur0.com | |
| github.com/lucasrodes/whatstk/commit/01d66d8 | 4daa8cea-433a-44bd-9456-53b127fc289a | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Robert Mihaila (en)
CNA: Amirreza Fadaeizadeh Bidari (en)
CNA: Xoán M. Otero Jorge (en)
CNA: Darío Rivas (en)
CNA: Secur0 CNA (en)
CNA: Lucas Rodés-Guirao (en)
Additional Advisory Data
Solutions
CNA: Upgrade to whatstk 0.9.0 or later.
There are currently no legacy QID mappings associated with this CVE.