CVE-2026-1109
Published: 18 January 2026
Summary
CVE-2026-1109 is a medium-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Cijliu Librtsp. Its CVSS base score is 4.8 (Medium).
Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Privilege Escalation (T1068); ranked at the 8.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-16 (Memory Protection).
Deeper analysis
CVE-2026-1109, published on 2026-01-18, is a buffer overflow vulnerability (CWE-119, CWE-120) in the rtsp_parse_request function of the cijliu librtsp library, affecting versions up to commit 2ec1a81ad65280568a0c7c16420d7c10fde13b04. The library employs a rolling release model for continuous delivery, so specific details on affected and updated releases are unavailable.
Exploitation requires local access (AV:L) with low privileges (PR:L), low attack complexity (AC:L), and no user interaction (UI:N), with an unchanged scope (S:U). A successful attack can achieve limited impacts on confidentiality, integrity, and availability (C:L/I:L/A:L), resulting in a CVSS 3.1 base score of 5.3.
Advisories from VulDB and a GitHub analysis document the issue but note no vendor response despite early disclosure contact, with no patches or mitigations provided.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-3186
Vulnerability details
A vulnerability was detected in cijliu librtsp up to 2ec1a81ad65280568a0c7c16420d7c10fde13b04. The impacted element is the function rtsp_parse_request. The manipulation results in buffer overflow. Attacking locally is a requirement. This product takes the approach of rolling releases to provide continious delivery.…
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Therefore, version details for affected and updated releases are not available. The vendor was contacted early about this disclosure but did not respond in any way.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Local buffer overflow in library parsing function enables code execution for privilege escalation on affected host process.
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation of all inputs to rtsp_parse_request to reject malformed data before buffer overflow occurs.
Enforces memory protections (e.g., ASLR, non-executable stacks) that block successful exploitation of the overflow in the librtsp parsing function.
Isolates the RTSP-handling process so a local overflow in librtsp cannot affect other system components or escalate privileges.