CVE-2025-3108 json
Unsafe Deserialization in JsonPickleSerializer Enables Remote Code Execution in run-llama/llama_index
published 2025-07-06 16 mo ago modified 2026-07-13 3 mo ago also GHSA-m84c-4c34-28gf , PYSEC-2025-249 , PYSEC-2026-1564 , EUVD-2025-20156
- cvss
- 5.0
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 43%
- public exploits
- 0
- none known
Summary
A critical deserialization vulnerability exists in the run-llama/llama_index library's JsonPickleSerializer component, affecting versions v0.12.27 through v0.12.40. This vulnerability allows remote code execution due to an insecure fallback to Python's pickle module. JsonPickleSerializer prioritizes deserialization using pickle.loads(), which can execute arbitrary code when processing untrusted data. Attackers can exploit this by crafting malicious payloads to achieve full system compromise. The root cause includes an insecure fallback mechanism, lack of validation or safeguards, misleading design, and violation of Python security guidelines.
Patch / fix
- pypi llama-index-core 0.12.41
- pypi llama-index 0.12.41
- run-llama run-llama/llama_index v0.12.41
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 16 mo ago
Exploit prediction
0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- huntr.com https://huntr.com/bounties/9b55a5e8-74e6-4241-b323-e360dc8b110a referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 5.0 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L |
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
| OSV | 3.0 | 5.0 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L |
| GitHub | 3.0 | 5.0 | CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L |
| OSV | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | llama-index-core | >=0.11.15, <0.12.41 |
0.12.41 |
| pypi | llama-index | >=0.12.27, <0.12.41 |
0.12.41 |
Affected products
- run-llama run-llama/llama_index
Classification
- Weakness
-
- CWE-1112 Incomplete Documentation of Program Execution
References
-
github.com
/run-llama/llama_index/commit/702e4340623092fac4cf2fe95eb9465034856da3
web, patch
-
huntr.com
/bounties/9b55a5e8-74e6-4241-b323-e360dc8b110a
web, exploit, third-party-advisory, evidence
-
nvd.nist.gov
/vuln/detail/CVE-2025-3108
advisory
-
github.com
/run-llama/llama_index
package
-
github.com
/run-llama/llama_index/blob/v0.12.41/CHANGELOG.md#llama-index-core-01241
web
-
pypi.org
/project/llama-index-core
package
-
github.com
/advisories/GHSA-m84c-4c34-28gf
advisory
Sources
- CVE List CVE-2025-3108
- GitHub Advisory GHSA-m84c-4c34-28gf
- NVD CVE-2025-3108
- OSV PYSEC-2026-1564
- OSV PYSEC-2025-249
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.