CVE-2026-1260 — sentencepiece
Fix: google/sentencepiece@d856b67CVE-2026-1260 is a Buffer Overflow vulnerability in sentencepiece. A fix is available for sentencepiece — see the affected versions and patch details below.
Invalid Memory Access in Sentencepiece,
Exploitation Status
No confirmed exploitation observed yet
- A successful exploit gives an attacker total control of the affected component, not partial access.
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for CVE-2026-1260.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Real-World Exposure
sentencepieceReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
Invalid memory access in Sentencepiece versions less than 0.2.1 when using a vulnerable model file, which is not created in the normal training procedure.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | sentencepiece | all versions | 0.2.1pip install --upgrade 'sentencepiece==0.2.1' |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for sentencepiece, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update sentencepiece to 0.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-1260 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2026-1260 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2026-1260. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
This IMPORTANT flaw in Sentencepiece allows invalid memory access when processing a specially crafted model file. A local attacker could exploit this by deceiving a user into loading a malicious file, potentially leading to denial of service, information disclosure, or arbitrary code execution. Red Hat products…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat OpenShift AI 2.25 | rhoai/odh-openvino-model-server-rhel9:1772093351 | RHSA-2026:3782 |
| Red Hat OpenShift AI 3.3 | rhoai/odh-openvino-model-server-rhel9:1771608633 | RHSA-2026:3713 |
Frequently Asked Questions
Is CVE-2026-1260 in your dependencies?
O3 Security finds CVE-2026-1260 across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.