CVE-2026-56788: RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrec

Q: How do I fix CVE-2026-56788?

rtklib: upgrade to newer than 2.4.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-56788 being exploited?

CVE-2026-56788 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-56788 affect?

CVE-2026-56788 affects rtklib. Severity is medium (CVSS 4.4). RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrecognized RINEX observation codes, allowing attackers to trigger denial of service. Crafted RINEX files with unknown observation typ

Q: How urgent is CVE-2026-56788?

Priority 22/100. Public exploit reference

Routine

MEDIUM 4.4UPGRADE

CVE-2026-56788 is a medium-severity flaw (CVSS 4.4) affecting rtklib. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrecognized RINEX observation codes, allowing attackers to trigger denial of service. Crafted RINEX files with unknown observation types cause negative array indexing into the codepris table, resulting in reliable crashes and potential memory disclosure of adjacent global data.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-125
Published	2026-06-25
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: rtklib

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 19:16 UTCPublished CVE record published
2026-10-25 22:10 UTCUpdated Record last modified

rtklib rtklib UPGRADE

Affected: <= 2.4.3

Fixed in: newer than 2.4.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy rtklib || rpm -q rtklib || rtklib --version

2. UPGRADE to newer than 2.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade rtklib

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade rtklib

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-56788?

rtklib: upgrade to newer than 2.4.3. Exact commands for each OS are on this page.

Is CVE-2026-56788 being exploited?

CVE-2026-56788 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-56788 affect?

CVE-2026-56788 affects rtklib. Severity is medium (CVSS 4.4). RTKLIB through 2.4.3 contains an out-of-bounds read vulnerability in getcodepri function when processing unrecognized RINEX observation codes, allowing attackers to trigger denial of service. Crafted RINEX files with unknown observation typ

How urgent is CVE-2026-56788?

Priority 22/100. Public exploit reference

Related CVEs

CVE-2026-56786 CRITICAL 9.8 UPGRADE RTKLIB through 2.4.3 contains an out-of-bounds write vulnerability in decode_type1033 function that fails to c
CVE-2026-56787 MEDIUM 6.5 UPGRADE RTKLIB through 2.4.3 contains an off-by-one out-of-bounds read vulnerability in the decode_ssr3 function at sr
CVE-2026-56789 MEDIUM 6.5 UPGRADE RTKLIB through 2.4.3 contains a heap buffer overflow vulnerability in the readrnxobsb function in src/rinex.c

References

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