CVE-2019-15717

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

9.8 CriticalFix available

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

2.49%Up 1.2 points since Apr 14, 2021

What each source reports

NVD Score used 9.8

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: CVE-2019-15717
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-416
Updated: 2026-11-02

CVE List No score

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: CVE-2019-15717
Updated: 2026-11-02

EUVDEUVD-2019-6653 No score

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: EUVD-2019-6653
Updated: 2026-11-03

GitHub AdvisoriesGHSA-gx32-945w-w9x4 9.8

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: GHSA-gx32-945w-w9x4
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-416
Updated: 2026-11-02

OSVALPINE-CVE-2019-15717 9.8

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: ALPINE-CVE-2019-15717
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-03

OSV 9.8

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: CVE-2019-15717
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2019-15717 9.8

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP.

Record: DEBIAN-CVE-2019-15717
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVMGASA-2019-0255 No score

Updated irssi packages fix security vulnerability

Updated irssi packages fix security vulnerability:

Irssi 1.2.x before 1.2.2 has a use-after-free if the IRC server sends a double CAP (CVE-2019-15717).

Record: MGASA-2019-0255
Updated: 2026-11-02

OSVopenSUSE-SU-2024:10865-1 No score

irssi-1.2.3-2.4 on GA media

These are all security issues fixed in the irssi-1.2.3-2.4 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:10865-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`irssi` Alpine:v3.10	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.11	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.12	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.13	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.14	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.15	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.16	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.17	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.18	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.19	1.2.0 up to 1.2.2-r0	1.2.2-r0

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Affected packages
Package	Affected	Fixed
`irssi` Alpine:v3.20	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.21	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.22	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.23	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Alpine:v3.24	1.2.0 up to 1.2.2-r0	1.2.2-r0
`irssi` Debian:12	before 1.2.2-1	1.2.2-1
`irssi` Debian:13	before 1.2.2-1	1.2.2-1
`irssi` Debian:14	before 1.2.2-1	1.2.2-1
`irssi` Mageia:7	before 1.2.2-1.mga7	1.2.2-1.mga7
`irssi` openSUSE:Tumbleweed From an advisory covering 26 CVEs	before 1.2.3-2.4	1.2.3-2.4

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	affected	OSV
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-2019-15717 is a critical vulnerability (CVSS 9.8) in Irssi, published August 29, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.49%, the 84th percentile. Fixed in irssi 1.2.2-r0.

References

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