{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-54417: Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-54417","status":"final","version":"1","initial_release_date":"2026-06-17T13:25:54.502Z","current_release_date":"2026-06-17T15:01:35.358Z","revision_history":[{"date":"2026-06-17T13:25:54.502Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-54417 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-54417"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-54417"},{"category":"external","summary":"github.com","url":"https://github.com/rxi/microtar/blob/master/src/microtar.c#L239"},{"category":"external","summary":"github.com","url":"https://github.com/rxi/microtar"},{"category":"external","summary":"Vulnerable source code: src/microtar.c (mtar_next)","url":"https://raw.githubusercontent.com/rxi/microtar/master/src/microtar.c"}]},"product_tree":{"branches":[{"category":"vendor","name":"rxi","branches":[{"category":"product_name","name":"microtar","branches":[{"category":"product_version","name":"0.1.0","product":{"name":"rxi microtar 0.1.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:rxi:microtar:0.1.0:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-54417","title":"Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS","notes":[{"category":"description","text":"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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v4":{"version":"4.0","vectorString":"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","baseScore":8.7,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}