CVE-2026-54417

Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS

State: Published
Severity: 8.7 High
Published: Jun 17, 2026
Updated: Aug 10, 2026
Reserved: Jun 13, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	TuranSec
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	TuranSec

Weaknesses

CWE-190 Integer Overflow or Wraparound
CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')

Affected Products

Product	Versions
microtarrxi	0.1.0Affected

References

https://github.com/rxi/microtar/blob/master/src/microtar.c#L239product
https://github.com/rxi/microtarproduct
Vulnerable source code: src/microtar.c (mtar_next)technical-description

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.