CVE catalog
CVE-2026-56787
RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafte
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.56% · Oct 25, 2026
RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at src/rtcm3.c:1446 that allows remote attackers to trigger a global buffer overflow via crafted RTCM3 SSR messages with attacker-controlled signal mode fields. Remote attackers can exploit this vulnerability by sending malicious SSR correction streams over NTRIP or serial connections to cause denial of service or crash RTKLIB rovers and CORS servers.
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 | not affected |
| 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 | Not affected | unimportant | Not reported | [1140766] |
Notes
[trixie] rtklib: Minor issue
OpenFactory catalog packages
[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
[Debian 12 (Bookworm)]
- [librtklib1]Not affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormNot affected
nvd · rtklib · debian · bookworm
2.4.3.b34+dfsg-1+b1· arm64 · bookwormNot affected
nvd · rtklib · debian · bookworm
- [librtklib-dev]Not affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormNot affected
nvd · rtklib · debian · bookworm
2.4.3.b34+dfsg-1+b1· arm64 · bookwormNot affected
nvd · rtklib · debian · bookworm
- [rtklib]Not affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormNot affected
nvd · rtklib · debian · bookworm
2.4.3.b34+dfsg-1+b1· arm64 · bookwormNot affected
nvd · rtklib · debian · bookworm
- [rtklib-doc]Not affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1· all · bookwormNot affected
nvd · rtklib · debian · bookworm
2.4.3.b34+dfsg-1· all · bookwormNot affected
nvd · rtklib · debian · bookworm
- [rtklib-qt]Not affected
Source package: [rtklib]
Details (2)
2.4.3.b34+dfsg-1+b1· amd64 · bookwormNot affected
nvd · rtklib · debian · bookworm
2.4.3.b34+dfsg-1+b1· arm64 · bookwormNot affected
nvd · rtklib · debian · bookworm
Observed:
References
- [https://github.com/tomojitakasu/RTKLIB/issues/798]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-56787]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-56787]
- [https://security-tracker.debian.org/tracker/CVE-2026-56787]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56787.json]
- [https://www.vulncheck.com/advisories/rtklib-off-by-one-out-of-bounds-read-in-decode-ssr3-via-rtcm3-ssr-message]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]