Is CVE-2026-34743 actively exploited?

No active exploitation of CVE-2026-34743 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34743 be exploited remotely?

Yes. CVE-2026-34743 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-34743?

CVE-2026-34743 has a CVSS score of 1.7 (LOW).

HOME VULNERABILITIESCVE-2026-34743

LOW

CVE-2026-34743

CWE-122Published: April 2, 2026· Updated: Apr 3, 2026

1.7

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:12.9th

Official Description

XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.

NVD Source

Technical Analysis

CVE-2026-34743 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.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.None

User InteractionNone

ScopeX

Impact

Confidentiality

Integrity

Availability

CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X