CVE catalog
CVE-2026-56786
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 fix
- Severity
- Critical · CVSS 9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.71% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | rtklib | sid | 2.4.3.b34+dfsg-1 | vulnerable |
| Debian | rtklib | forky | 2.4.3.b34+dfsg-1 | vulnerable |
| Debian | rtklib | trixie | 2.4.3.b34+dfsg-1 | vulnerable |
| Debian | rtklib | bookworm | 2.4.3.b34+dfsg-1 | vulnerable |
| Cpe | rtklib | Not reported | Not reported | vulnerable |
| Cpe | rtklib | Not reported | Not reported | unknown |
| Cpe | rtklib | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | rtklib | source | sid | (unfixed) | not yet assigned | Not reported | [1140766] |
| Debian | rtklib | source | forky | (unfixed) | not yet assigned | Not reported | [1140766] |
| Debian | rtklib | source | trixie | (unfixed) | not yet assigned | Not reported | [1140766] |
| Debian | rtklib | source | bookworm | (unfixed) | not yet assigned | Not reported | [1140766] |
Notes
[trixie] rtklib: Minor issue [bookworm] rtklib: Minor issue; the decode_type1033 overflow past the 64-byte sta_t descriptor fields consists only of strncpy NUL padding, no attacker-controlled bytes escape the field, and it requires an attacker-controlled RTCM3/NTRIP correction stream
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [librtklib1]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
2.4.3.b34+dfsg-1+b1· arm64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
- [librtklib-dev]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
2.4.3.b34+dfsg-1+b1· arm64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
- [rtklib]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
2.4.3.b34+dfsg-1+b1· arm64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
- [rtklib-doc]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1· all · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
2.4.3.b34+dfsg-1· all · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
- [rtklib-qt]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
2.4.3.b34+dfsg-1+b1· arm64 · bookwormAffected
nvd · rtklib · debian · bookworm; nvd · rtklib · debian · 12
[Debian 13 (Trixie)]
- [librtklib1]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b2· amd64 · trixieAffected
nvd · rtklib · debian · 13
2.4.3.b34+dfsg-1+b2· arm64 · trixieAffected
nvd · rtklib · debian · 13
- [librtklib-dev]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b2· amd64 · trixieAffected
nvd · rtklib · debian · 13
2.4.3.b34+dfsg-1+b2· arm64 · trixieAffected
nvd · rtklib · debian · 13
- [rtklib]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b2· amd64 · trixieAffected
nvd · rtklib · debian · 13
2.4.3.b34+dfsg-1+b2· arm64 · trixieAffected
nvd · rtklib · debian · 13
- [rtklib-doc]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1· all · trixieAffected
nvd · rtklib · debian · 13
2.4.3.b34+dfsg-1· all · trixieAffected
nvd · rtklib · debian · 13
- [rtklib-qt]Affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b2· amd64 · trixieAffected
nvd · rtklib · debian · 13
2.4.3.b34+dfsg-1+b2· arm64 · trixieAffected
nvd · rtklib · debian · 13
Observed:
References
- [https://github.com/tomojitakasu/RTKLIB/issues/799]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56786]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56786]
- [https://security-tracker.debian.org/tracker/CVE-2026-56786]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56786.json]
- [https://www.vulncheck.com/advisories/rtklib-out-of-bounds-write-in-decode-type1033-via-crafted-rtcm3-message]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]