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The urwid web display backend (urwid/display/web.py) generates web session identifiers (urwid_id) in Screen.start() by concatenating two random.randrange(10**9) calls that use Python's Mersenne Twister PRNG, which is not cryptographically secure. Each call consumes approximately 30 bits of PRNG state, and the Mersenne Twister internal state is approximately 19,937 bits, so an attacker who observes approximately 334 session IDs (for example via the X-Urwid-ID HTTP response header) can fully reconstruct the internal state and predict all past and future session IDs (Path B). The same identifier is also used as the filename of a FIFO created in the world-listable /tmp directory (for example /tmp/urwid375487765176907690.in), so any local user on the host can list /tmp to enumerate active session tokens directly (Path A). With a valid session ID, an attacker can read the victim's terminal screen via the polling endpoint, inject keystrokes into the victim's session (yielding OS-level code execution with the session owner's privileges if the session runs a shell), and inject exit sequences or flood the FIFO to terminate or crash the session. A prior Bandit S311 warning on this usage was suppressed with # noqa: S311 rather than fixed
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This issue has been addressed in the following products: Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Via RHSA-2026:57638 https://access.redhat.com/errata/RHSA-2026:57638
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Red Hat Enterprise Linux 8.8 Telecommunications Update Service Via RHSA-2026:57637 https://access.redhat.com/errata/RHSA-2026:57637
This issue has been addressed in the following products: Red Hat Enterprise Linux 10 Via RHSA-2026:58561 https://access.redhat.com/errata/RHSA-2026:58561
This issue has been addressed in the following products: Red Hat Enterprise Linux 8 Via RHSA-2026:58562 https://access.redhat.com/errata/RHSA-2026:58562
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Via RHSA-2026:58954 https://access.redhat.com/errata/RHSA-2026:58954
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Via RHSA-2026:58953 https://access.redhat.com/errata/RHSA-2026:58953
This issue has been addressed in the following products: Red Hat Enterprise Linux 9 Via RHSA-2026:58952 https://access.redhat.com/errata/RHSA-2026:58952
This issue has been addressed in the following products: Red Hat Enterprise Linux 9.6 Extended Update Support Via RHSA-2026:58955 https://access.redhat.com/errata/RHSA-2026:58955
This issue has been addressed in the following products: Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Via RHSA-2026:59198 https://access.redhat.com/errata/RHSA-2026:59198
This issue has been addressed in the following products: Red Hat Enterprise Linux 10.0 Extended Update Support Via RHSA-2026:60353 https://access.redhat.com/errata/RHSA-2026:60353