The vulnerability CVE-2026-5315 affects the Nothings stb library, specifically the function stbtt__buf_get8 in the stb_truetype.h file, which handles TrueType font (TTF) files. An attacker can cause an out-of-bounds read by crafting malicious input that manipulates this function. This vulnerability is present in all versions up to and including 1.26. The vulnerability allows remote attackers to read memory outside the intended buffer boundaries, which may lead to information disclosure or application instability. The vendor was notified but has not issued any response or patch. The CVSS 4.0 base score is 5.3, indicating medium severity, with network attack vector, low attack complexity, no privileges required, and user interaction needed.

Successful exploitation of this vulnerability can result in out-of-bounds memory reads, potentially exposing sensitive information or causing application crashes. Since the attack vector is network-based and requires no privileges, remote attackers can exploit this vulnerability by supplying crafted TTF files. However, there is no evidence of active exploitation in the wild at this time.

No official patch or remediation is currently available as the vendor has not responded to the disclosure. Users and developers relying on the stb library should consider avoiding processing untrusted TTF files or implementing additional input validation and sandboxing measures to mitigate potential exploitation. Monitor vendor channels for any future updates or patches addressing this issue.