Is CVE-2026-29078 actively exploited?

No active exploitation of CVE-2026-29078 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-29078 be exploited remotely?

Yes. CVE-2026-29078 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-29078?

CVE-2026-29078 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2026-29078

CWE-191Published: March 13, 2026· Updated: Mar 18, 2026

7.5

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.6th

Official 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.

NVD Source

Technical Analysis

CVE-2026-29078 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.