VulnerabilityPublished 27 Apr 2026

CVE-2026-7183: aligungr UERANSIM · Uncaught Exception

Affects aligungr UERANSIMSource CVE Database V5

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Mentioned vulnerabilities

CVE-2024-37877

Public exploit available · CVSS 6.9 Medium · fixed in 3.2.8 : patch aligungr UERANSIM as a priority.

Data as of 30 Oct 2026, 06:59 UTC

CVSS 4.0 base score

6.9Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.4% chance of exploitation in 30 days – higher than 34% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 3.2.8

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: None
User Interaction: None
Vulnerable system confidentiality: None
Vulnerable system integrity: None
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: None: There is no loss of confidentiality within the Vulnerable System.
Vulnerable system integrity: None: There is no loss of integrity within the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 27 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: evidence found.
CVSS exploit maturity: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CVSS vector, the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
aligungrUERANSIM	Affected 3.2.0 – 3.2.7 8 affected builds	Fixed in–
GitHubaligungr/UERANSIM`pkg:github/aligungr/UERANSIM`Other threats	Affected 3.2.0 – 3.2.7 8 affected builds	Fixed in–

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AI-suggested

A fixed version 3.2.8 of aligungr UERANSIM has been released by the vendor to address this vulnerability. It is recommended to upgrade affected installations to version 3.2.8 or later. Patch status is confirmed by the vendor's release and the provided patch identifier. No additional mitigation steps are indicated.

Description

CVE-2026-7183 is a medium severity vulnerability in aligungr UERANSIM versions up to 3.2.7. It involves an uncaught exception triggered by manipulation of the pduLength argument in the function rls::DecodeRlsMessage within the Radio Link Simulation Layer. This issue can be exploited remotely and may cause application instability. The vendor has released version 3.2.8 which fixes this vulnerability. Users are advised to upgrade to this fixed version to mitigate the risk.

Impact

Exploitation of this vulnerability may result in an uncaught exception causing the affected application to crash or become unstable. There is no indication of privilege escalation, data disclosure, or code execution. The attack can be initiated remotely without authentication, which increases the risk of denial of service conditions.

Summary

This vulnerability affects the function rls::DecodeRlsMessage in the src/lib/rls/rls_pdu.cpp component of aligungr UERANSIM up to version 3.2.7. Manipulating the pduLength argument leads to an uncaught exception, potentially causing a denial of service or application crash. The issue is remotely exploitable without requiring privileges or user interaction. The vendor responded promptly and released version 3.2.8 containing the patch identified by commit ca1a66fffe282767bb08618af9f848e3b68ea47b. This vulnerability is related to CVE-2024-37877.

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 5 May 2026, 07:32 UTC

Technical details

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