TI-2025-29933 Aliases CVE-2025-47436 GHSA-h527-m3cp-9hm7

Apache ORC: Potential Heap Buffer Overflow during C++ LZO Decompression

LOW 28CWE-122Published 2025-05-14 · Updated 2025-05-14

Key facts

Attack vector: Local
Privileges required: High
User interaction: Active
Attack complexity: Low
Attack requirements: Present
Impact type: —
Confidentiality · integrity · availability: Low · High · High
Fix status: No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Heap-based Buffer Overflow vulnerability in Apache ORC. A vulnerability has been identified in the ORC C++ LZO decompression logic, where specially crafted malformed ORC files can cause the decompressor to allocate a 250-byte buffer but then attempts to copy 295 bytes into it. It causes memory corruption. This issue affects Apache ORC C++ library: through 1.8.8, from 1.9.0 through 1.9.5, from 2.0.0 through 2.0.4, from 2.1.0 through 2.1.1. Users are recommended to upgrade to version 1.8.9, 1.9.6, 2.0.5, and 2.1.2, which fix the issue.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00566 47th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Apache	Apache ORC	up to 1.8.8; 1.9.0 – 1.9.5; 2.0.0 – 2.0.4; 2.1.0 – 2.1.1	—	No fix listed	CNA

Apache ORC VendorApache Affected up to 1.8.8; 1.9.0 – 1.9.5; 2.0.0 – 2.0.4; 2.1.0 – 2.1.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:apache:orc::::::::	before 1.8.9; 1.9.0 to before 1.9.6; 2.0.0 to before 2.0.5; 2.1.0 to before 2.1.2	Vulnerable	Apache

cpe:2.3:a:apache:orc:*:*:*:*:*:*:*:* Versions before 1.8.9; 1.9.0 to before 1.9.6; 2.0.0 to before 2.0.5; 2.1.0 to before 2.1.2 Vulnerable ·Apache

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-47436
2026-10-03 Alias added: GHSA-h527-m3cp-9hm7

References

Advisory 3

TI-2018-05792 Uncontrolled recursion in Apache ORC CVSS 3.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences