Vulnerability · Published Nov 5, 2026 · Assigned by VulnCheck
CVE-2026-123199eBook-speaker through 6.2.0 Stack-based Buffer Overflow via element name attribute
Medium 5.5
In plain English
A medium-severity buffer overflow in eBook-speaker from book-readers. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 4% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.1%top 96.4% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
eBook-speaker 6.1.0 through 6.2.0 contains a stack buffer overflow vulnerability in get_attributes() in src/common.c caused by an unbounded strcpy of an element's name attribute. Attackers can craft an EPUB or DAISY book with a name attribute of 511 or more characters to corrupt the stack and crash the reader when opened.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | ebook-speaker | no fix listed | DEBIAN-CVE-2026-123199 |
| Debian:13 | ebook-speaker | no fix listed | DEBIAN-CVE-2026-123199 |
| Debian:14 | ebook-speaker | no fix listed | DEBIAN-CVE-2026-123199 |
| Ubuntu:22.04:LTS | ebook-speaker | no fix listed | UBUNTU-CVE-2026-123199 |
| Ubuntu:24.04:LTS | ebook-speaker | no fix listed | UBUNTU-CVE-2026-123199 |
| Ubuntu:26.04:LTS | ebook-speaker | no fix listed | UBUNTU-CVE-2026-123199 |
| Ubuntu:26.10 | ebook-speaker | no fix listed | UBUNTU-CVE-2026-123199 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| book-readers | eBook-speaker | 6.1.0 – through 6.2.0 |
Weakness: CWE-120 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- https://github.com/book-readers/ebook-speaker/commit/23b5c86585d7e3c27c932b112f4e36858e70f210 patch
- https://github.com/book-readers/ebook-speaker/blob/4a8f457a0fd65a96463c0fa9bd0612242c081dc8/src/common.c#L631-L632 technical-description
- VulnCheck Advisory: eBook-speaker through 6.2.0 Stack-based Buffer Overflow via element name attribute third-party-advisory