CVE-2026-29078

HIGH

7.5

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.

Details CVE

Score CVSS v3.17.5

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie3/13/2026

Derniere modification3/18/2026

Sourcenvd

Observations honeypot0

Produits affectes

lexbor:lexbor

Faiblesses (CWE)

CWE-191CWE-787

References

https://github.com/lexbor/lexbor/security/advisories/GHSA-mrwr-xh7f-96v3(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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