CVE-2026-2662
Published: 18 February 2026
Summary
CVE-2026-2662 is a low-severity Improper Restriction of Operations within the Bounds of a Memory Buffer (CWE-119) vulnerability in Lily-Lang Lily. Its CVSS base score is 3.3 (Low).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 1.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Threat & Defense at a Glance
Threat & Defense Details
Likely Mitigating ControlsAI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Memory protections (e.g., W^X, ASLR) make exploitation of buffer-boundary violations far harder to turn into code execution.
Ongoing control assessments and code testing (static/dynamic analysis, fuzzing) surface memory buffer restriction failures, which are then remediated before release.
Managed runtimes used by platform-independent applications (e.g., JVM, CLR) enforce memory safety, preventing most buffer overflows that require direct memory manipulation.
Detects exploitation attempts that produce memory corruption, crashes, or anomalous behavior.
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
OOB read in lily interpreter triggers local application crash (DoS); directly maps to exploitation-based endpoint DoS with public PoC file execution.
NVD Description
A weakness has been identified in FascinatedBox lily up to 2.3. This vulnerability affects the function count_transforms of the file src/lily_emitter.c. This manipulation causes out-of-bounds read. The attack can only be executed locally. The exploit has been made available to…
more
the public and could be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.
Deeper analysisAI
CVE-2026-2662 is an out-of-bounds read vulnerability in FascinatedBox lily versions up to 2.3, specifically affecting the count_transforms function in the src/lily_emitter.c file. This flaw, associated with CWE-119, CWE-125, and CWE-787, has a CVSS v3.1 base score of 3.3 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L), indicating low severity with primarily availability impact.
The vulnerability requires local access with low privileges to exploit, involving low-complexity manipulation that triggers the out-of-bounds read. Successful exploitation results in limited denial-of-service effects, such as application crashes, with no confidentiality or integrity impacts.
Advisories note that the project was informed early via GitHub issue #381 but has not responded, and no patches are available. A public proof-of-concept exploit is available at https://github.com/oneafter/0122/blob/main/i381/repro.lily, which could facilitate attacks. Additional details are in the project repository at https://github.com/FascinatedBox/lily/issues/381 and VulDB entries at https://vuldb.com/?ctiid.346460 and https://vuldb.com/?id.346460.
The exploit has been made publicly available, increasing the risk of targeted local attacks despite the lack of project response.
Details
- CWE(s)