Critical
rtklib — security advisory
RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.
- Products
- rtklib
- Affected versions
- 2.4.3+dfsg1-1, 2.4.3+dfsg1-2.1, 2.4.3+dfsg1-2.1build1, 2.4.3.b34+dfsg-1, 2.4.3.b34+dfsg-1build1, 2.4.3.b34+dfsg-1build2, 2.4.3.b34+dfsg-1build3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-56786
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:47 UTC · Revision 1
Source evidence
RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.
osv:UBUNTU-CVE-2026-56786
rtklib
Fixed versions: Not specified
rtklib
Fixed versions: Not specified
rtklib
Fixed versions: Not specified
rtklib
Fixed versions: Not specified
rtklib
Fixed versions: Not specified
rtklib
Fixed versions: Not specified
rtklib
Fixed versions: Not specified
Complete source record
{
"id": "9e936a2ed447e677f3497f93a6b8ef7f019fc826236cfe7c1b789c464045d8c5",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-56786",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-56786",
"summary": "RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to clamp length counters to destination buffer size, allowing up to 191-byte overflow into fixed 64-byte descriptor fields. An attacker controlling an NTRIP or serial RTCM3 correction stream can craft a valid CRC-bearing type-1033 message to corrupt adjacent rtcm_t object members, potentially achieving arbitrary code execution or denial of service.",
"evidence": "osv:UBUNTU-CVE-2026-56786",
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"severity": "critical",
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"metrics": [
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"modified": "2026-10-17T12:59:10.503893064Z",
"provider": "osv",
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"references": [
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"https://www.cve.org/CVERecord?id=CVE-2026-56786",
"https://github.com/tomojitakasu/RTKLIB/issues/799"
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"source_id": "core-osv",
"document_id": 359379,
"published_at": "2026-06-25T19:16:00+00:00"
}