CVE-2026-91189— 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
Quick assessment
Affected
Eclipse Foundation Eclipse ThreadX - GUIX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
GUIX 的二进制资源加载器从未验证字体页面的字形范围是否格式正确。 和 直接从文件中按原样读取，且仅对 的上界进行了校验。因此，若某页面声明 ，则表达式 会发生下溢，产生一个极大的无符号计数值。 该计数值会与字形记录的大小相乘，以预留加载缓冲区，而此乘法运算未进行溢出检查，导致结果回绕为一个极小值，使得加载器分配的缓冲区远小于即将写入的数据量。随后，在加载阶段，系统会以更窄的数据类型重新计算该计数，并将攻击者控制的多条字形记录写入该尺寸不足的缓冲区，从而引发缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-91189
Vulnerability Information
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Vulnerability Title
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
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Eclipse Foundation | Eclipse ThreadX - GUIX | 0 ~ 6.5.1.202602a | - |
|
II. Public POCs for CVE-2026-91189
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-91189 (1)
Same Patch Batch · Eclipse Foundation · 2026-10-20 · 29 CVEs total
| CVE-2026-113620 | 9.8 CRITICAL | Eclipse ioFog operator WebSocket accepts an unverified JWT |
| CVE-2026-93475 | 9.3 CRITICAL | Out-of-bounds Write via an Unbounded RSA Modulus in NetX Secure X.509 |
| CVE-2026-94018 | 8.8 HIGH | NetX Duo Web HTTP server releases an uninitialized packet pointer on the PUT Content-Lengt |
| CVE-2026-92853 | 8.7 HIGH | Out-of-bounds Read via a Zero-length TLS 1.3 Certificate Message in NetX Secure |
| CVE-2026-92843 | 8.7 HIGH | Out-of-bounds Read via the TLS 1.3 Certificate extensions_length in NetX Secure |
| CVE-2026-95109 | 8.5 HIGH | Cortex-A7 module data validation checks only the first address of a caller-supplied range |
| CVE-2026-94192 | 8.5 HIGH | Module object deallocation can free a live ThreadX kernel object |
| CVE-2026-91186 | 8.4 HIGH | PNG decoder: a duplicate IHDR chunk after IDAT resizes the image after allocation, causing |
| CVE-2026-91041 | 7.8 HIGH | FileX fault-tolerant log replay writes past the destination sector when mounting a crafted |
| CVE-2026-113619 | 7.5 HIGH | Eclipse ioFog renders request templates before authentication |
| CVE-2026-95107 | 7.0 HIGH | Module object allocation size overflow corrupts the manager object pool |
| CVE-2026-94023 | 6.9 MEDIUM | Module delete dispatchers do not enforce kernel-object ownership before irreversible delet |
| CVE-2026-94024 | 6.9 MEDIUM | Module Manager object lookup validates one byte of a module's search name |
| CVE-2026-108062 | 6.9 MEDIUM | Pre-authentication OIDC discovery and JWKS fetches run synchronously on the asyncio event |
| CVE-2026-93003 | 6.9 MEDIUM | NetX Duo Web HTTP server interprets request body content as HTTP header fields |
| CVE-2026-91059 | 6.8 MEDIUM | JPEG decoder: a duplicate SOF0 after SOS publishes a pixelmap that misreports its own allo |
| CVE-2026-95108 | 6.8 MEDIUM | Deleting a user-mode module thread leaks its privileged kernel stack |
| CVE-2026-92449 | 6.8 MEDIUM | Binary resource loader: unbounded map_id from a theme file causes a heap out-of-bounds wri |
| CVE-2026-92446 | 6.8 MEDIUM | GUIX binary resource loader reads past the end of a resource, because no length for it eve |
| CVE-2026-97400 | 6.8 MEDIUM | jdmpview / DTFJ reads arbitrary local files and makes arbitrary outbound requests when ope |
Showing top 20 of 29 CVEs. View all on vendor page → →
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V. Comments for CVE-2026-91189
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