CVE-2026-40203
Low · 3.7CVSS
3.7
EPSS
0.3%
Published
Aug 28, 2026
CISA due date
—
The record
When IMAP compression is enabled, the same compression state is reused across responses in a session, so response sizes depend on both attacker-supplied mail and other mail in the same mailbox. An attacker that can send mail to a user and can also observe the sizes of that user's IMAP traffic can confirm whether the body of a small message matches a guessed text. Recovery of arbitrary unknown content was not demonstrated, but the attack can disclose whether a secret-like message body matches a candidate. Disable IMAP compression. Update to non-vulnerable version. No publicly available exploits are known.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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