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4 vulnerabilities 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
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/rxi/microtar/blob/master/src/m… | product |
| https://github.com/rxi/microtar | product |
| https://raw.githubusercontent.com/rxi/microtar/ma… | technical-description |
Credits
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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
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/rxi/microtar/blob/master/src/m… | product |
| https://github.com/rxi/microtar | product |
| https://raw.githubusercontent.com/rxi/microtar/ma… | technical-description |
Credits
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CVE-2026-43623 (GCVE-0-2026-43623)
Vulnerability from cvelistv5 – Published: 2026-06-01 18:04 – Updated: 2026-06-02 15:38 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
SSVC
Exploitation: poc
Automatable: no
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- CWE-121 - Stack-based Buffer Overflow
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/rxi/microtar/issues/28 | technical-descriptionexploit |
| https://github.com/rxi/microtar/issues/29 | issue-tracking |
| https://github.com/rxi/microtar/issues/30 | issue-tracking |
| https://www.vulncheck.com/advisories/microtar-sta… | third-party-advisory |
Date Public
2026-02-16 00:00
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CVE-2026-4012 (GCVE-0-2026-4012)
Vulnerability from cvelistv5 – Published: 2026-03-12 07:32 – Updated: 2026-03-12 15:02
VLAI
Title
rxi fe fe.c read_ out-of-bounds
Summary
A vulnerability was determined in rxi fe up to ed4cda96bd582cbb08520964ba627efb40f3dd91. The impacted element is the function read_ of the file src/fe.c. This manipulation with the input 1 causes out-of-bounds read. The attack requires local access. The exploit has been publicly disclosed and may be utilized. This product uses a rolling release model to deliver continuous updates. As a result, specific version information for affected or updated releases is not available. The project was informed of the problem early through an issue report but has not responded yet.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
6 references
| URL | Tags |
|---|---|
| https://vuldb.com/?id.350534 | vdb-entrytechnical-description |
| https://vuldb.com/?ctiid.350534 | signaturepermissions-required |
| https://vuldb.com/?submit.769774 | third-party-advisory |
| https://github.com/rxi/fe/issues/34 | issue-tracking |
| https://github.com/oneafter/0211/blob/main/fe/repro | exploit |
| https://github.com/rxi/fe/ | product |
Impacted products
Credits
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