CVE-2026-6368: 
Wolfi vulnerability analysis and mitigation

CVE-2026-6368 is a memory handling flaw in the GNU C Library (glibc) affecting versions 2.0 through 2.43. When wordexp() is called with the WRDE_APPEND flag, the function can return invalid memory in the we_wordv member; subsequent calls to wordfree() on the returned structure may cause the process to abort. The vulnerability was published on August 10, 2026, and is tracked under glibc security advisory GLIBC-SA-2026-0014. It carries a CVSS v3.1 base score of 5.5 (Medium) and a CVSS v4.0 base score of 2.1 (Low) (GitHub Advisory, Red Hat Bugzilla).

The root cause is classified under CWE-908 (Use of Uninitialized Resource) and CWE-1341 (Multiple Releases of Same Resource or Handle). When wordexp() is invoked with WRDE_APPEND, it is expected to append results to an existing wordexp_t structure; however, a flaw in the implementation causes the we_wordv pointer to reference invalid memory rather than a properly allocated buffer. When the caller subsequently invokes wordfree() to release the structure, the library attempts to free this invalid pointer, triggering a process abort. Exploitation requires local access and the ability to influence application behavior that calls wordexp() with WRDE_APPEND (GitHub Advisory, Red Hat Bugzilla).

The primary impact is a Denial of Service (DoS): any process linked against an affected glibc version that calls wordexp() with WRDE_APPEND can crash when wordfree() is subsequently invoked. There is no evidence of confidentiality or integrity impact under the CVSS v3.1 assessment, though the CVSS v4.0 scoring notes low confidentiality, integrity, and availability impacts on both the vulnerable and subsequent systems. The scope is limited to applications that use this specific API pattern and are linked against glibc 2.0–2.43 (GitHub Advisory, Red Hat Bugzilla).

There is no known public proof-of-concept exploit and no evidence of in-the-wild exploitation as of the time of publication (GitHub Advisory). The NVD SSVC assessment confirms exploitation status as "none" and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. The EPSS score is approximately 0.107% (1st percentile), indicating a very low probability of exploitation in the near term. No threat actor attribution has been reported.

Update glibc to a version greater than 2.43, which contains the fix for this vulnerability. A patch is available and referenced via the GitHub Advisory (GHSA-cm6j-gmqf-j2cm) and the upstream glibc advisory GLIBC-SA-2026-0014. As a temporary workaround, consider auditing and restricting application use of wordexp() with the WRDE_APPEND flag until patching is complete, particularly for non-critical functionality (GitHub Advisory, Red Hat Bugzilla).

Red Hat has opened a security response bug (Bug 2513608) and assigned it medium priority and severity, with dependent tracking bugs for affected Red Hat products (Red Hat Bugzilla). No significant broader community commentary or media coverage has been identified at this time, consistent with the low severity and limited exploitability of the vulnerability.