Vulnerability · Published Oct 14, 2026 · Assigned by VulnCheck
CVE-2026-110604Mini-XML 4.0.0 through 4.0.6 Stack Out-of-Bounds Write via mxml_strtod()
Low 3.6
In plain English
A low-severity security flaw in Mini-XML from Michael R Sweet. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.6Low
Exploit odds (30 days)0.2%top 87.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
Mini-XML 4.0.0 through 4.0.6 contains an off-by-one stack out-of-bounds write in mxml_strtod() when the locale decimal point is not '.'. Attackers can supply XML with a 63-digit REAL value followed by '.' to write a NUL byte past the 64-byte stack buffer, corrupting stack memory or crashing the process.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mxml | no fix listed | DEBIAN-CVE-2026-110604 |
| Debian:13 | mxml | no fix listed | DEBIAN-CVE-2026-110604 |
| Debian:14 | mxml | 4.0.6-3 | DEBIAN-CVE-2026-110604 |
| Ubuntu:22.04:LTS | mxml | no fix listed | UBUNTU-CVE-2026-110604 |
| Ubuntu:24.04:LTS | mxml | no fix listed | UBUNTU-CVE-2026-110604 |
| Ubuntu:26.04:LTS | mxml | no fix listed | UBUNTU-CVE-2026-110604 |
| Ubuntu:26.10 | mxml | no fix listed | UBUNTU-CVE-2026-110604 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Michael R Sweet | Mini-XML | 4.0.0 – through 4.0.6 |
Weakness: CWE-193 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L
References
- https://hackmd.io/@haind-pwn/mxml-strtod-locale-stack-overflow third-party-advisory
- https://github.com/michaelrsweet/mxml/blob/v4.0.6/mxml-file.c#L1860-L1887 technical-description
- https://github.com/michaelrsweet/mxml/commit/367c7ddd3387f65e867d776216de274bcaa3dae1 patch
- VulnCheck Advisory: Mini-XML 4.0.0 through 4.0.6 Stack Out-of-Bounds Write via mxml_strtod() third-party-advisory
- https://hackmd.io/@haind-pwn/cve-2026-110604-mxml-strtod-locale-stack-overflow exploit