What’s Vulnerable › Vulnerabilities

CVE-2023-23626: Denial of service when feeding malformed size arguments in go-bitfield

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2023-02-09 · updated 2026-06-17
• Weakness: CWE-754

Description

go-bitfield is a simple bitfield package for the go language aiming to be more performant that the standard library. When feeding untrusted user input into the size parameter of `NewBitfield` and `FromBytes` functions, an attacker can trigger `panic`s. This happen when the `size` is a not a multiple of `8` or is negative. There were already a note in the `NewBitfield` documentation, however known users of this package are subject to this issue. Users are advised to upgrade. Users unable to upgrade should ensure that `size` is a multiple of 8 before calling `NewBitfield` or `FromBytes`.

Affected products

• ipfs go-bitfield: before 1.1.0 — fixed in 1.1.0

How to fix

Upgrade to a fixed version: ipfs go-bitfield 1.1.0. Check the vendor advisory for mitigations.

References

• https://github.com/ipfs/go-bitfield/commit/5e1d256fe043fc4163343ccca83862c69c52e579
• https://github.com/ipfs/go-bitfield/security/advisories/GHSA-2h6c-j3gf-xp9r
• https://github.com/ipfs/go-bitfield/commit/5e1d256fe043fc4163343ccca83862c69c52e579
• https://github.com/ipfs/go-bitfield/security/advisories/GHSA-2h6c-j3gf-xp9r

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