CVE-2026-54417

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

17 Jun 2026, 17:17

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-06-17 14:17

Updated : 2026-06-17 17:17

NVD link : CVE-2026-54417

Mitre link : CVE-2026-54417

CVE.ORG link : CVE-2026-54417

JSON object : View

Products Affected

No product.

CWE

CWE-190

Integer Overflow or Wraparound

CWE-835

Loop with Unreachable Exit Condition ('Infinite Loop')

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