CVE-2026-1260

Invalid Memory Access in Sentencepiece,

8.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Passive

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.17%Up 0.2 points since Jan 23, 2026

What each source reports

CVE List Score used 8.5

Invalid Memory Access in Sentencepiece,

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.

Record: CVE-2026-1260
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-119, CWE-119
Updated: 2026-11-02

EUVDEUVD-2026-3802 8.5

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.

Record: EUVD-2026-3802
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-38vq-g6vr-w8wf 8.5

Sentencepiece has a a heap overflow issue

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.

Record: GHSA-38vq-g6vr-w8wf
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-119
Updated: 2026-11-02

NVD 8.5

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.

Record: CVE-2026-1260
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-02

OSV 8.5

Invalid Memory Access in Sentencepiece,

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.

Record: CVE-2026-1260
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-119
Updated: 2026-11-02

OSVGHSA-38vq-g6vr-w8wf 8.5

Sentencepiece has a a heap overflow issue

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.

Record: GHSA-38vq-g6vr-w8wf
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-119
Updated: 2026-11-02

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OSVOESA-2026-3915 7.8

sentencepiece security update

Security Fix(es):

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.(CVE-2026-1260)

Record: OESA-2026-3915
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVOESA-2026-3916 7.8

sentencepiece security update

Security Fix(es):

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.(CVE-2026-1260)

Record: OESA-2026-3916
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVOESA-2026-3917 7.8

sentencepiece security update

Security Fix(es):

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.(CVE-2026-1260)

Record: OESA-2026-3917
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVOESA-2026-4045 7.8

sentencepiece security update

Security Fix(es):

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.(CVE-2026-1260)

Record: OESA-2026-4045
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVPYSEC-2026-1909 8.5

Sentencepiece has a a heap overflow issue

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.

Record: PYSEC-2026-1909
CVSS 4.0: 8.5 HighCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`sentencepiece` PyPI	before 0.2.1	0.2.1
`sentencepiece` PyPI	before 0.2.1, plus listed versions 0.0.00.0.20.0.30.0.40.0.5 Show 27 moreShow less 0.0.60.0.70.0.90.1.00.1.10.1.20.1.30.1.40.1.50.1.60.1.70.1.80.1.810.1.820.1.830.1.850.1.860.1.900.1.910.1.920.1.940.1.950.1.960.1.970.1.980.1.990.2.0	0.2.1
`sentencepiece` openEuler:24.03-LTS-SP3	before 0.1.98-2.oe2403sp3	0.1.98-2.oe2403sp3
`sentencepiece` openEuler:22.03-LTS-SP4	before 0.1.92-7.oe2203sp4	0.1.92-7.oe2203sp4
`sentencepiece` openEuler:24.03-LTS-SP1	before 0.1.98-2.oe2403sp1	0.1.98-2.oe2403sp1
`sentencepiece` openEuler:24.03-LTS-SP4	before 0.1.98-2.oe2403sp4	0.1.98-2.oe2403sp4

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-1260 is a high vulnerability (CVSS 8.5) in Google Sentencepiece, published January 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.17%, the 6th percentile. Fixed in sentencepiece 0.2.1.

References

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