CVE-2026-29078
High
Description
Lexbor is a web browser engine library. Prior to 2.7.0, the ISO‑2022‑JP encoder in Lexbor fails to reset the temporary size variable between iterations. The statement ctx->buffer_used -= size with a stale size = 3 causes an integer underflow that wraps to SIZE_MAX. Afterwards, memcpy is called with a negative length, leading to an out‑of‑bounds read from the stack and an out‑of‑bounds write to the heap. The source data is partially controllable via the contents of the DOM tree. This vulnerability is fixed in 2.7.0.
SeverityHigh
CVSS7.5
Exploit probability—
ProductLexbor
PublishedMar 13, 2026
First seenMar 13, 2026
Weakness typeCWE-191CWE-191CWE-787Out-of-bounds write
How to fix
Update
- lexbor lexbor2.7.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| lexbor lexbor | v < 2.7.0 | 2.7.0 |
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