Integer Underflow in Lexbor ISO‑2022‑JP Encoder
Summary
Integer Underflow in Lexbor ISO‑2022‑JP Encoder
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-29078 lexbor Fixed in: 3.0.0-1
- Ubuntu UBUNTU-CVE-2026-29078 lexbor
References
- advisory github.com
- advisory github.com
- advisory nvd.nist.gov