What’s Vulnerable › Vulnerabilities

CVE-2020-15904

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-07-22 · updated 2026-06-17
• Weakness: CWE-787

Description

A buffer overflow in the patching routine of bsdiff4 before 1.2.0 allows an attacker to write to heap memory (beyond allocated bounds) via a crafted patch file.

Affected products

• Pypi Bsdiff4: before 1.2.0 — fixed in 1.2.0

How to fix

Upgrade to a fixed version: Pypi Bsdiff4 1.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/ilanschnell/bsdiff4/blob/master/CHANGELOG.txt
• https://github.com/ilanschnell/bsdiff4/commit/49a4cee2feef7deaf9d89e5e793a8824930284d7
• https://github.com/ilanschnell/bsdiff4/blob/master/CHANGELOG.txt
• https://github.com/ilanschnell/bsdiff4/commit/49a4cee2feef7deaf9d89e5e793a8824930284d7

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