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CVE-2026-9323 (GCVE-0-2026-9323)
Vulnerability from cvelistv5 – Published: 2026-07-18 13:51 – Updated: 2026-07-20 19:31- CWE-338 - Use of Cryptographically Weak Pseudo-Random Number Generator (PRNG)
| URL | Tags |
|---|---|
| https://github.com/urwid/urwid/security/advisorie… | vendor-advisory |
| https://github.com/urwid/urwid | product |
| https://github.com/urwid/urwid/commit/24acd12f0d0… | patch |
| https://github.com/urwid/urwid/issues/1127 | issue-tracking |
| https://github.com/urwid/urwid/pull/1128 | issue-tracking |
| https://www.vulncheck.com/advisories/insecure-prn… | third-party-advisory |
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alsa-2026:58561
Vulnerability from osv_almalinux
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
- urwid: Urwid: Predictable session IDs lead to remote code execution and information disclosure (CVE-2026-9323)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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"affected": [
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"package": {
"ecosystem": "AlmaLinux:10",
"name": "python3-urwid"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.5.3-4.el10_2.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"details": "Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. \n\nSecurity Fix(es): \n\n * urwid: Urwid: Predictable session IDs lead to remote code execution and information disclosure (CVE-2026-9323)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
"id": "ALSA-2026:58561",
"modified": "2026-08-25T08:38:16Z",
"published": "2026-08-24T00:00:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://access.redhat.com/errata/RHSA-2026:58561"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-9323"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2502072"
},
{
"type": "ADVISORY",
"url": "https://errata.almalinux.org/10/ALSA-2026-58561.html"
}
],
"related": [
"CVE-2026-9323"
],
"summary": "Important: python-urwid security update"
}
alsa-2026:58562
Vulnerability from osv_almalinux
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
- urwid: Urwid: Predictable session IDs lead to remote code execution and information disclosure (CVE-2026-9323)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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},
"ranges": [
{
"events": [
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"introduced": "0"
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}
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}
],
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"modified": "2026-08-25T08:48:24Z",
"published": "2026-08-24T00:00:00Z",
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],
"related": [
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}
alsa-2026:58952
Vulnerability from osv_almalinux
Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems.
Security Fix(es):
- urwid: Urwid: Predictable session IDs lead to remote code execution and information disclosure (CVE-2026-9323)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
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"details": "Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. \n\nSecurity Fix(es): \n\n * urwid: Urwid: Predictable session IDs lead to remote code execution and information disclosure (CVE-2026-9323)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
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FKIE_CVE-2026-9323
Vulnerability from fkie_nvd - Published: 2026-07-18 14:17 - Updated: 2026-07-23 15:24| Vendor | Product | Version |
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GHSA-83X9-8WVQ-RRCP
Vulnerability from github – Published: 2026-07-18 15:31 – Updated: 2026-07-18 15:31The 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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RHSA-2026:57637
Vulnerability from csaf_redhat - Published: 2026-08-20 18:15 - Updated: 2026-08-26 22:04A flaw was found in the urwid web display backend. This vulnerability arises from the use of a cryptographically insecure pseudo-random number generator (PRNG) for web session identifiers, making them predictable. An attacker could either observe enough session IDs to reconstruct the PRNG state or, if local, enumerate active session tokens from temporary files. Successful exploitation allows an attacker to read a victim's terminal screen, inject keystrokes leading to operating system-level code execution, or cause a denial of service by terminating the session.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python-urwid-0:1.3.1-4.el8_8.1.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python-urwid-debugsource-0:1.3.1-4.el8_8.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python-urwid-debugsource-0:1.3.1-4.el8_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-urwid-0:1.3.1-4.el8_8.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-urwid-0:1.3.1-4.el8_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-urwid-debuginfo-0:1.3.1-4.el8_8.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S:python3-urwid-debuginfo-0:1.3.1-4.el8_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:python-urwid-0:1.3.1-4.el8_8.1.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:python-urwid-debugsource-0:1.3.1-4.el8_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:python3-urwid-0:1.3.1-4.el8_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.TUS:python3-urwid-debuginfo-0:1.3.1-4.el8_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
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RHSA-2026:57638
Vulnerability from csaf_redhat - Published: 2026-08-20 17:59 - Updated: 2026-08-26 22:04A flaw was found in the urwid web display backend. This vulnerability arises from the use of a cryptographically insecure pseudo-random number generator (PRNG) for web session identifiers, making them predictable. An attacker could either observe enough session IDs to reconstruct the PRNG state or, if local, enumerate active session tokens from temporary files. Successful exploitation allows an attacker to read a victim's terminal screen, inject keystrokes leading to operating system-level code execution, or cause a denial of service by terminating the session.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:python-urwid-0:1.3.1-4.el8_4.1.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:python-urwid-debugsource-0:1.3.1-4.el8_4.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-urwid-0:1.3.1-4.el8_4.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.AUS:python3-urwid-debuginfo-0:1.3.1-4.el8_4.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python-urwid-0:1.3.1-4.el8_4.1.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python-urwid-debugsource-0:1.3.1-4.el8_4.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-urwid-0:1.3.1-4.el8_4.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.4.0.Z.EUS.EXTENSION:python3-urwid-debuginfo-0:1.3.1-4.el8_4.1.x86_64 | — |
Vendor Fix
fix
Workaround
|
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RHSA-2026:58562
Vulnerability from csaf_redhat - Published: 2026-08-24 02:43 - Updated: 2026-08-26 22:04A flaw was found in the urwid web display backend. This vulnerability arises from the use of a cryptographically insecure pseudo-random number generator (PRNG) for web session identifiers, making them predictable. An attacker could either observe enough session IDs to reconstruct the PRNG state or, if local, enumerate active session tokens from temporary files. Successful exploitation allows an attacker to read a victim's terminal screen, inject keystrokes leading to operating system-level code execution, or cause a denial of service by terminating the session.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python-urwid-0:1.3.1-5.el8_10.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python-urwid-debugsource-0:1.3.1-5.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python-urwid-debugsource-0:1.3.1-5.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python-urwid-debugsource-0:1.3.1-5.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python-urwid-debugsource-0:1.3.1-5.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-0:1.3.1-5.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-0:1.3.1-5.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-0:1.3.1-5.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-0:1.3.1-5.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:1.3.1-5.el8_10.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:1.3.1-5.el8_10.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:1.3.1-5.el8_10.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.10.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:1.3.1-5.el8_10.x86_64 | — |
Vendor Fix
fix
Workaround
|
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RHSA-2026:58952
Vulnerability from csaf_redhat - Published: 2026-08-24 11:29 - Updated: 2026-08-26 22:04A flaw was found in the urwid web display backend. This vulnerability arises from the use of a cryptographically insecure pseudo-random number generator (PRNG) for web session identifiers, making them predictable. An attacker could either observe enough session IDs to reconstruct the PRNG state or, if local, enumerate active session tokens from temporary files. Successful exploitation allows an attacker to read a victim's terminal screen, inject keystrokes leading to operating system-level code execution, or cause a denial of service by terminating the session.
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|---|---|---|---|
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fix
Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python-urwid-debugsource-0:2.1.2-4.el9_8.1.aarch64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python-urwid-debugsource-0:2.1.2-4.el9_8.1.ppc64le | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python-urwid-debugsource-0:2.1.2-4.el9_8.1.s390x | — |
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Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-0:2.1.2-4.el9_8.1.aarch64 | — |
Vendor Fix
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Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-0:2.1.2-4.el9_8.1.ppc64le | — |
Vendor Fix
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Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-0:2.1.2-4.el9_8.1.s390x | — |
Vendor Fix
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Workaround
|
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-0:2.1.2-4.el9_8.1.x86_64 | — |
Vendor Fix
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Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:2.1.2-4.el9_8.1.aarch64 | — |
Vendor Fix
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Workaround
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:2.1.2-4.el9_8.1.ppc64le | — |
Vendor Fix
fix
Workaround
|
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| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:2.1.2-4.el9_8.1.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.8.0.Z.MAIN.EUS:python3-urwid-debuginfo-0:2.1.2-4.el9_8.1.x86_64 | — |
Vendor Fix
fix
Workaround
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RHSA-2026:58561
Vulnerability from csaf_opensuse - Published: 2026-08-24 02:50 - Updated: 2026-08-26 22:04A flaw was found in the urwid web display backend. This vulnerability arises from the use of a cryptographically insecure pseudo-random number generator (PRNG) for web session identifiers, making them predictable. An attacker could either observe enough session IDs to reconstruct the PRNG state or, if local, enumerate active session tokens from temporary files. Successful exploitation allows an attacker to read a victim's terminal screen, inject keystrokes leading to operating system-level code execution, or cause a denial of service by terminating the session.
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-10.2.Z:python-urwid-0:2.5.3-4.el10_2.5.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-0:2.5.3-4.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-0:2.5.3-4.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-0:2.5.3-4.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-0:2.5.3-4.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-debuginfo-0:2.5.3-4.el10_2.5.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-debuginfo-0:2.5.3-4.el10_2.5.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-debuginfo-0:2.5.3-4.el10_2.5.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-10.2.Z:python3-urwid-debuginfo-0:2.5.3-4.el10_2.5.x86_64 | — |
Vendor Fix
fix
Workaround
|
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"BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.aarch64",
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"BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.s390x",
"BaseOS-10.2.Z:python-urwid-debugsource-0:2.5.3-4.el10_2.5.x86_64",
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "urwid: Urwid: Predictable session IDs lead to remote code execution and information disclosure"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.