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CVE-2025-6211

MD5 Hash Collision in run-llama/llama_index

6.5 MediumFix available

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to version 0.12.28, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
Low

Exploit likelihood

0.36%Up 0.3 points since Jul 11, 2025
90%50%10%1%

What each source reports

CVE List Score used 6.5

MD5 Hash Collision in run-llama/llama_index

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to version 0.12.28, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
CVE-2025-6211
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-440
Updated
2026-11-02
EUVDEUVD-2025-20993 6.5

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to version 0.12.28, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
EUVD-2025-20993
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-5hq9-5r78-2gjh 6.5

LlamaIndex vulnerable to data loss through hash collisions in its DocugamiReader class

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to but excluding version 0.12.41, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
GHSA-5hq9-5r78-2gjh
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-440
Updated
2026-11-02
NVD 6.5

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to version 0.12.28, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
CVE-2025-6211
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-440
Updated
2026-11-02
OSV 6.5

MD5 Hash Collision in run-llama/llama_index

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to version 0.12.28, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
CVE-2025-6211
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-440
Updated
2026-11-02
OSVGHSA-5hq9-5r78-2gjh 6.5

LlamaIndex vulnerable to data loss through hash collisions in its DocugamiReader class

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to but excluding version 0.12.41, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
GHSA-5hq9-5r78-2gjh
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Weakness
CWE-440
Updated
2026-11-02
OSVPYSEC-2026-1566 6.5

LlamaIndex vulnerable to data loss through hash collisions in its DocugamiReader class

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to but excluding version 0.12.41, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
PYSEC-2026-1566
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02
OSVPYSEC-2026-2606 6.5

LlamaIndex vulnerable to data loss through hash collisions in its DocugamiReader class

A vulnerability in the DocugamiReader class of the run-llama/llama_index repository, up to but excluding version 0.12.41, involves the use of MD5 hashing to generate IDs for document chunks. This approach leads to hash collisions when structurally distinct chunks contain identical text, resulting in one chunk overwriting another. This can cause loss of semantically or legally important document content, breakage of parent-child chunk hierarchies, and inaccurate or hallucinated responses in AI outputs. The issue is resolved in version 0.3.1.

Record
PYSEC-2026-2606
CVSS 3.0
6.5 MediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
llama-index
PyPI
before 0.12.41
0.12.41
llama-index-readers-docugami
PyPI
before 0.3.1
0.3.1
llama-index
PyPI
before 0.12.41, plus listed versions
0.10.00.10.10.10.100.10.110.10.12
Show 45 moreShow less
0.10.130.10.13.post10.10.140.10.150.10.160.10.170.10.180.10.190.10.200.10.220.10.230.10.240.10.250.10.260.10.270.10.280.10.290.10.30.10.300.10.310.10.320.10.330.10.340.10.350.10.360.10.370.10.380.10.390.10.40.10.400.10.410.10.420.10.430.10.440.10.450.10.45.post10.10.460.10.470.10.480.10.48.post10.10.490.10.50.10.500.10.510.10.52
0.12.41
llama-index-readers-docugami
PyPI
before 0.3.1, plus listed versions
0.0.10.0.20.1.00.1.10.1.2
Show 4 moreShow less
0.1.30.1.40.2.00.3.0
0.3.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2025-6211 is a medium vulnerability (CVSS 6.5) in Llamaindex, published July 10, 2025. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.36%, the 30th percentile. Fixed in llama-index 0.12.41.

References

This page doesn't list everything

Left out here: 412 versions. The JSON record has them.

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