CVE-2026-29078
Integer Underflow in Lexbor ISO‑2022‑JP Encoder
Vexday Risk Score
21Baixo
Decisão SSVC (CISA)
Track
Sem sinal de exploração → monitorar
CVSS 8.2EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —
Ciclo de vida
13 mar 2026Publicada no NVD
Recomendação: Monitorar — sem sinal de exploração no momento.
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Produtos afetados
lexbor · lexborQuer saber se a sua infraestrutura está exposta a isto?
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