CVE-2021-42613

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of...

7.8 HighFix available

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.88%Unchanged since May 25, 2022

What each source reports

NVD Score used 7.8

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: CVE-2021-42613
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-415
Updated: 2026-11-02

CVE List No score

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: CVE-2021-42613
Updated: 2026-11-02

EUVDEUVD-2021-29577 No score

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: EUVD-2021-29577
Updated: 2026-11-03

GitHub AdvisoriesGHSA-69m6-42x6-85hc 7.8

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of...

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: GHSA-69m6-42x6-85hc
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness: CWE-415
Updated: 2026-11-02

OSV 7.8

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: CVE-2021-42613
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-42613 7.8

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: DEBIAN-CVE-2021-42613
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2021-42613 7.8

A double free in cleanup_index in index.c in Halibut 1.2 allows an attacker to cause a denial of service or possibly have other unspecified impact via a crafted text document.

Record: UBUNTU-CVE-2021-42613
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2022-0237 No score

Updated halibut packages fix security vulnerability

Use-after-free in cleanup_index() in index.c (CVE-2021-42612) Double free in cleanup_index() in index.c (CVE-2021-42613) Use-after-free in info_width_internal() in bk_info.c (CVE-2021-42614)

Record: MGASA-2022-0237
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`halibut` Debian:12	before 1.3-1	1.3-1
`halibut` Debian:13	before 1.3-1	1.3-1
`halibut` Debian:14	before 1.3-1	1.3-1
`halibut` Mageia:8 From an advisory covering 3 CVEs	before 1.3-1.mga8	1.3-1.mga8
`halibut` Ubuntu:16.04:LTS	All versions, plus listed versions 1.0+svn20090906-91.1-11.1-21.1-31.1-4	None known
`halibut` Ubuntu:18.04:LTS	All versions, plus listed versions 1.2-1	None known
`halibut` Ubuntu:20.04:LTS	All versions, plus listed versions 1.2-2	None known
`halibut` Ubuntu:22.04:LTS	All versions, plus listed versions 1.2-4build11.2-51.3-11.3-2	None known
`halibut` Ubuntu:24.04:LTS	All versions, plus listed versions 1.3-2	None known
`halibut` Ubuntu:25.10	All versions, plus listed versions 1.3-2	None known
`halibut` Ubuntu:26.10	All versions, plus listed versions 1.3-5	None known
`halibut` Ubuntu:26.04:LTS	All versions, plus listed versions 1.3-21.3-5	None known

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-42613 is a high vulnerability (CVSS 7.8) in Halibut Project Halibut, published May 24, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.88%, the 59th percentile. Fixed in halibut 1.3-1.

References

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