CVE-2026-54417

HIGH EPSS 33.5%

Published Jun 17, 20262w ago · Modified Jun 17, 20262w ago

8.7 CVSS 4.0

High

Published Jun 17, 2026 2w ago

Last Modified Jun 17, 2026 2w ago

Description

An integer overflow in the mtar_next() function in src/microtar.c in rxi microtar 0.1.0 allows a remote attacker to cause a denial of service (uncontrolled CPU consumption / infinite loop) via a crafted tar archive. mtar_next() computes the offset to the next record as round_up(h.size, 512) + sizeof(mtar_raw_header_t) using 32-bit arithmetic. When the header size field is a multiple of 512 in the range 0xFFFFFC01-0xFFFFFE00 (e.g. 0xFFFFFE00), the addition wraps to 0, so mtar_next() seeks to the current record position instead of advancing. As a result, mtar_find() and any loop that iterates entries with mtar_next() repeat indefinitely over the same record, hanging the process at 100% CPU with no recovery.

CVSS Details

Base Score

8.7

Exploitability

—

Impact

—

Vector string

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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

Attack Vector Network

Attack Complexity Low

Privileges Required None

User Interaction None

Scope X

Threat Intelligence

EPSS Exploit Probability

33.5% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 2

CWE-190 Integer Overflow or Wraparound Numeric Error

CWE-835

References 3

github.com https://github.com/rxi/microtar
github.com https://github.com/rxi/microtar/blob/master/src/microtar.c#L239
raw.githubusercontent.com https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.