| Name | CVE-2026-42392 |
| Description | An attacker that has valid credentials can send an invalid IMAP URLFETCH command, which causes uninitialized memory to be included in the error response returned to the client. Process memory contents can be disclosed to the client, which may include sensitive data. Disable the IMAP URLAUTH functionality. Update to non-vulnerable version. No publicly available exploits are known. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-6526-1 |
| Debian Bugs | 1146018 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| dovecot (PTS) | bookworm, bookworm (security) | 1:2.3.19.1+dfsg1-2.1+deb12u6 | fixed |
| trixie | 1:2.4.1+dfsg1-6+deb13u6 | vulnerable | |
| trixie (security) | 1:2.4.1+dfsg1-6+deb13u7 | fixed | |
| forky | 1:2.4.5+dfsg1-2 | fixed | |
| sid | 1:2.4.5+dfsg1-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| dovecot | source | bookworm | (not affected) | |||
| dovecot | source | trixie | 1:2.4.1+dfsg1-6+deb13u7 | DSA-6526-1 | ||
| dovecot | source | (unstable) | 1:2.4.5+dfsg1-1 | 1146018 |
[bookworm] - dovecot <not-affected> (Vulnerable code not present, introduced in 2.4.0)
https://documentation.open-xchange.com/dovecot/security/advisories/html/2026/oxdc-adv-2026-0003.html#cve-2026-42392-imap-urlauth-leaks-memory-into-user-visible-error-messages
Fixed by: https://github.com/dovecot/core/commit/48d8141049f7150a0469a4efe68669fbf8bcbb24
Introduced with: https://github.com/dovecot/core/commit/bb193c273e63ffa42c5c0b51ecd8860398e3beab (2.4.0)