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CVE-2026-27857 is an uncontrolled memory-consumption vulnerability in Dovecot imap-login. A crafted IMAP NOOP command containing thousands of opening and closing parentheses causes substantial per-connection memory allocation. An attacker can prolong allocation by withholding the line-feed that terminates the command and can amplify consumption through many connections, potentially exhausting the process virtual-memory limit.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability addressed by the referenced TuxCare/Rocky Linux 9.6 security update. The content does not describe the flaw type or impact.
A vulnerability addressed by the referenced Alma Linux 9.6/TuxCare security advisory; the provided content does not describe the flaw's technical nature.
A remotely exploitable, low-complexity vulnerability requiring no privileges or user interaction that affects availability only (CVSS v3 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.