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CVE-2026-9323 is a session hijacking vulnerability in the urwid web display backend, specifically in urwid/display/web.py. In Screen.start(), the backend generates the web session identifier by concatenating two random.randrange(10**9) values produced by Python's Mersenne Twister PRNG. Because Mersenne Twister is not cryptographically secure, repeated observation of issued session identifiers can allow reconstruction of the generator's internal state and prediction of past and future session IDs. The same identifier is also reused as the filename for a FIFO created in a world-listable temporary directory, enabling local users on the host to enumerate active session tokens directly. Possession of a valid session ID allows unauthorized access to the associated web terminal session, including viewing terminal output and sending input to the victim session.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.