How severe is CVE-2025-47436?

CVE-2025-47436 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-47436 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-47436?

CVE-2025-47436 affects Apache Orc. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-47436?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-47436 have an EU (EUVD) identifier?

Yes. CVE-2025-47436 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14947.

When was CVE-2025-47436 published?

CVE-2025-47436 was published on 2025-05-14 and last updated on 2026-06-17.

CVE-2025-47436

CVE-2025-47436 is a critical-severity vulnerability in Apache Orc with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 6.0
EPSS exploit prediction: 0% (37th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-14947
Weakness: CWE-122
Affected product: Apache Orc
Published: 2025-05-14
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2025-47436?: 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.
How severe is CVE-2025-47436?: CVE-2025-47436 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-47436 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (37th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-47436?: CVE-2025-47436 affects Apache Orc. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-47436?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-47436 have an EU (EUVD) identifier?: Yes. CVE-2025-47436 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-14947.
When was CVE-2025-47436 published?: CVE-2025-47436 was published on 2025-05-14 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:apache:orc:*:*:*:*:*:*:*:*

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