What is CVE-2025-29476?

CVE-2025-29476 is a medium-severity vulnerability in N/a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2025-04-04.

How severe is CVE-2025-29476?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2025-29476 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in N/a

CVE-2025-29476

Buffer Overflow vulnerability in compress_chunk_fuzzer with oss-fuzz on commit 16450518afddcb3139de627157208e49bfef6987 in c-blosc2 v.2.17.0 and before.

Vulnerability class: Buffer Overflow

Published 2025-04-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (13.8th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 14th percentile — 13.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

lmarch2/poc

References

Frequently asked questions

What is CVE-2025-29476?: CVE-2025-29476 is a medium-severity vulnerability in N/a, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 5.5/10. Published 2025-04-04.
How severe is CVE-2025-29476?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2025-29476 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.