What’s Vulnerable › Vulnerabilities

CVE-2025-67269

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-01-02 · updated 2026-07-15
• Weakness: CWE-191

Description

An integer underflow vulnerability exists in the `nextstate()` function in `gpsd/packet.c` of gpsd versions prior to commit `ffa1d6f40bca0b035fc7f5e563160ebb67199da7`. When parsing a NAVCOM packet, the payload length is calculated using `lexer->length = (size_t)c - 4` without checking if the input byte `c` is less than 4. This results in an unsigned integer underflow, setting `lexer->length` to a very large value (near `SIZE_MAX`). The parser then enters a loop attempting to consume this massive number of bytes, causing 100% CPU utilization and a Denial of Service (DoS) condition.

Affected products

• ntpsec gpsd: before 3.27.1 — fixed in 3.27.1

How to fix

Upgrade to a fixed version: ntpsec gpsd 3.27.1. Check the vendor advisory for mitigations.

References

• https://github.com/Jaenact/gspd_cve/blob/main/CVE-2025-67269/README.md
• https://gitlab.com/gpsd/gpsd
• https://gitlab.com/gpsd/gpsd/-/commit/ffa1d6f40bca0b035fc7f5e563160ebb67199da7
• https://access.redhat.com/errata/RHSA-2026:0770
• https://access.redhat.com/errata/RHSA-2026:0771
• https://access.redhat.com/security/cve/CVE-2025-67269
• https://bugzilla.redhat.com/show_bug.cgi?id=2426810
• https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-67269.json

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