CVE-2025-67125
CVE-2025-67125 is a medium-severity vulnerability in Docopt Docopt.cpp with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.
Key facts
- Severity: Medium (CVSS 3.x base score 4.4)
- EPSS exploit prediction: 0% (11th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-4308
- Weakness: CWE-190
- Affected product: Docopt Docopt.cpp
- Published:
- Last modified:
Description
A signed integer overflow in docopt.cpp v0.6.2 (LeafPattern::match in docopt_private.h) when merging occurrence counters (e.g., default LONG_MAX + first user "-v/--verbose") can cause counter wrap (negative/unbounded semantics) and lead to logic/policy bypass in applications that rely on occurrence-based limits, rate-gating, or safety toggles. In hardened builds (e.g., UBSan or -ftrapv), the overflow may also result in process abort (DoS).
Frequently asked questions
- What is CVE-2025-67125?
- A signed integer overflow in docopt.cpp v0.6.2 (LeafPattern::match in docopt_private.h) when merging occurrence counters (e.g., default LONG_MAX + first user "-v/--verbose") can cause counter wrap (negative/unbounded semantics) and lead to logic/policy bypass in applications that rely on occurrence-based limits, rate-gating, or safety toggles. In hardened builds (e.g., UBSan or -ftrapv), the overflow may also result in process abort (DoS).
- How severe is CVE-2025-67125?
- CVE-2025-67125 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity low, and availability low.
- Is CVE-2025-67125 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (11th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-67125?
- CVE-2025-67125 affects Docopt Docopt.cpp. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-67125?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2025-67125 have an EU (EUVD) identifier?
- Yes. CVE-2025-67125 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4308.
- When was CVE-2025-67125 published?
- CVE-2025-67125 was published on 2026-01-23 and last updated on 2026-06-17.
References
- https://gist.github.com/thesmartshadow/672afe8828844c833f46f8ebe2f5f3bd
- https://github.com/docopt/docopt.cpp
Affected products (1)
- cpe:2.3:a:docopt:docopt.cpp:0.6.2:*:*:*:*:*:*:*
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