CVE-2026-91189

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Source
https://cve.org/CVERecord?id=CVE-2026-91189
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91189.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-91189
Aliases
  • GHSA-hgcj-22cg-4hfv
Published
2026-10-20T14:53:44Z
Modified
2026-10-21T02:53:50Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
Summary
GUIX binary resource loader: unvalidated glyph range causes an integer underflow and a heap out-of-bounds write when loading an untrusted font or theme
Details

The GUIX binary resource loader never checks that a font page's glyph range is well formed. gx_page_header_first_glyph and gx_page_header_last_glyph are read verbatim from the file and only the upper bound of last_glyph is validated, so a page declaring first_glyph > last_glyph makes last - first + 1 underflow to a very large unsigned count.

That count is multiplied by a glyph record size to reserve the load buffer, and the multiply is unchecked, so it wraps to a small value and the loader allocates a buffer far smaller than the data it is about to write. The load pass then recomputes the count in a narrower type and writes attacker-controlled glyph records into the undersized buffer.

Database specific 
{
    "cna_assigner":  "eclipse",
    "cwe_ids":  [
        "CWE-190",
        "CWE-680",
        "CWE-787"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/91xxx/CVE-2026-91189.json"
}
References

Affected packages

Git / github.com/eclipse-threadx/guix

Affected ranges

Type
GIT
Repo
https://github.com/eclipse-threadx/guix
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last Affected
52c1bb406843eb556d26dc28c65b13434f64e0ef
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "last_affected":  "6.5.1.202602a"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        }
    ]
}

Affected versions

v6.*
v6.0.1_rel
v6.0.2_rel
v6.0_rel
v6.1.10_rel
v6.1.11_rel
v6.1.12_rel
v6.1.3_rel
v6.1.4_rel
v6.1.5_rel
v6.1.6_rel
v6.1.7_rel
v6.1.8_rel
v6.1.9_rel
v6.1_rel
v6.2.0_rel
v6.2.1_rel
v6.3.0_rel
v6.4.0_rel
v6.4.1_rel
v6.4.2_rel
v6.4.3.202503_rel
v6.4.5.202504_rel
v6.5.1.202602_rel
v6.5.1.202602a_rel

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-91189.json"