Is there a public exploit for CVE-2026-121564?

No public exploit for CVE-2026-121564 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-121564?

CVE-2026-121564 scores CVSS 1.8 (v4.0), rated low.

What does CVE-2026-121564 affect?

CVE-2026-121564 affects lucasrodes whatstk.

1.8 Low

Incomplete Comparison with Missing Factors (CWE-1023) in mergechats() (whatstk/utils/chatmerge.py), reached from BaseChat.merge(), in…

CVE-2026-121564

Incomplete Comparison with Missing Factors (CWE-1023) in mergechats() (whatstk/utils/chatmerge.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 mergetwochats() 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.

Assessment

CVSS: 1.8 (v4.0)
Severity: Low
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 3 November 2026
Last updated: 3 November 2026
Affected: lucasrodes · whatstk
Assigner: Secur0

CVSS vectorCVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

At the source

EUVD (ENISA)

References

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