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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:3460-1 advisory.

    This update for python-urwid fixes the following issue:

    - CVE-2026-9323: web session IDs generated by `Screen.start()` are not cryptographically secure     (bsc#1271868).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has a package installed that is affected by a vulnerability as referenced in the SUSE-SU-2026:3425-1 advisory.

    This update for python-urwid fixes the following issue

    CVE-2026-9323: web session IDs generated by `Screen.start()` are not cryptographically secure     (bsc#1271868).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0729 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-9323:
    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.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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 (CVE-2026-9323)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
331836	SUSE SLED15 / SLES15 Security Update : python-urwid (SUSE-SU-2026:3460-1)	Nessus	SuSE Local Security Checks	critical
331455	SUSE SLED15 / SLES15 Security Update : python-urwid (SUSE-SU-2026:3425-1)	Nessus	SuSE Local Security Checks	critical
330794	TencentOS Server 4: python-urwid (TSSA-2026:0729)	Nessus	Tencent Local Security Checks	critical
327792	Linux Distros Unpatched Vulnerability : CVE-2026-9323	Nessus	Misc.	critical

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