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3 vulnerabilities found for microtar by rxi
CVE-2026-55738 (GCVE-0-2026-55738)
Vulnerability from cvelistv5 – Published: 2026-06-17 13:45 – Updated: 2026-06-17 15:00
VLAI?
Title
Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field
Summary
A stack-based buffer overflow exists in the raw_to_header() function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy() without guaranteeing null termination of the source. The POSIX ustar format permits these fixed-width fields to be fully populated with non-null bytes, so a crafted archive whose linkname field (followed by the trailing padding of the 512-byte raw header) contains no null terminator causes strcpy() to read past the end of the 512-byte raw header stack buffer and to write past the destination header buffer. A remote attacker who supplies a crafted TAR archive that the victim opens or parses (via mtar_open(), mtar_read_header(), or mtar_find()) can cause an out-of-bounds read and a stack buffer overflow, resulting in denial of service (crash) and potentially arbitrary code execution. Confirmed with AddressSanitizer: stack-buffer-overflow READ of size 356 in raw_to_header at src/microtar.c:112.
Severity ?
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Credits
Saidakbarxon Maxsudxonov
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CVE-2026-54417 (GCVE-0-2026-54417)
Vulnerability from cvelistv5 – Published: 2026-06-17 13:25 – Updated: 2026-06-17 15:01
VLAI?
Title
Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS
Summary
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.
Severity ?
CWE
Assigner
References
| URL | Tags | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||
Credits
Saidakbarxon Maxsudxonov
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CVE-2026-43623 (GCVE-0-2026-43623)
Vulnerability from cvelistv5 – Published: 2026-06-01 18:04 – Updated: 2026-06-23 16:16 X_Open Source Unsupported When Assigned
VLAI?
Title
microtar 0.1.0 Stack-Based Buffer Overflow via raw_to_header()
Summary
microtar through 0.1.0 contains a stack-based buffer overflow vulnerability in the raw_to_header() function in src/microtar.c that allows attackers to corrupt adjacent stack memory by supplying a crafted TAR archive with non-null-terminated name or linkname fields. The function uses strcpy() to copy 100-byte ustar format fields that lack null terminators, causing writes of up to 355 bytes into a 100-byte destination buffer when mtar_open(), mtar_find(), or mtar_read_header() process attacker-supplied TAR archives.
Severity ?
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
| URL | Tags | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||
Credits
Byambadalai Sumiya (@ByamB4)
Saidakbarxon Maxsudxonov
mms (@3291710458)
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