CVE catalog
CVE-2026-56789
RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c that allows attackers to trigger memory corruption by failing to clamp satellite count val
- Severity
- High · CVSS 7.1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/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
- 0.42% · Oct 25, 2026
RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c that allows attackers to trigger memory corruption by failing to clamp satellite count values from RINEX epoch headers. Attackers can craft malicious RINEX files declaring more than 64 satellites per epoch to cause heap buffer overflow writes and out-of-bounds stack reads, crashing RTKLIB-based applications including rnx2rtkp and RTKPOST.
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; unclamped RINEX epoch satellite count leads to out-of-bounds access in readrnxobsb, requires processing an attacker-supplied RINEX observation file
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/796]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56789]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56789]
- [https://security-tracker.debian.org/tracker/CVE-2026-56789]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56789.json]
- [https://www.vulncheck.com/advisories/rtklib-heap-buffer-overflow-and-stack-read-via-oversized-rinex-epoch-satellite-count]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]