CVE-2026-116566

socket.getaddrinfo() accepts embedded null bytes in host and port

5.3 Medium

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Attack profile

How easy it is to exploit

Attack vector: Adjacent network
Complexity: Low
Privileges needed: High
User interaction: Passive

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: None

Exploit likelihood

0.26%Unchanged since Oct 30, 2026

What each source reports

CVE List Score used 5.3

socket.getaddrinfo() accepts embedded null bytes in host and port

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: CVE-2026-116566
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-158
Updated: 2026-11-02

EUVDEUVD-2026-113279 5.3

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: EUVD-2026-113279
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-q27h-3599-9x7j 5.3

socket.getaddrinfo() previously accepted null bytes within *host* and *port* parameters which can...

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: GHSA-q27h-3599-9x7j
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-158
Updated: 2026-11-02

NVD 5.3

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: CVE-2026-116566
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness: CWE-158
Updated: 2026-11-02

OSV 5.3

socket.getaddrinfo() accepts embedded null bytes in host and port

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: CVE-2026-116566
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness: CWE-158
Updated: 2026-11-04

OSVDEBIAN-CVE-2026-116566 5.3

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: DEBIAN-CVE-2026-116566
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated: 2026-11-02

Show 4 moreShow less

OSVUBUNTU-CVE-2026-116566 5.3

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: UBUNTU-CVE-2026-116566
CVSS 4.0: 5.3 MediumCVSS:4.0/AV:A/AC:L/AT:P/PR:H/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Updated: 2026-11-05

OSVAZL-111530 No score

CVE-2026-116566 affecting package python-py 1.11.0-1

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: AZL-111530
Updated: 2026-11-05

OSVAZL-111542 No score

CVE-2026-116566 affecting package python3 3.12.16-1

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: AZL-111542
Updated: 2026-11-05

OSVPSF-2026-48 No score

socket.getaddrinfo() previously accepted null bytes within host and port parameters which can cause the values to be silently truncated.

Record: PSF-2026-48
Updated: 2026-11-02

Affected products

python software foundation cpython

Affected packages

Affected packages
Package	Affected	Fixed
`python-py` Azure Linux:3	through 1.11.0-1	None known
`python3` Azure Linux:3	through 3.12.16-1	None known
`python3.11` Debian:12	All versions, plus listed versions 3.11.2-63.11.2-6+deb12u13.11.2-6+deb12u23.11.2-6+deb12u33.11.2-6+deb12u4 Show 24 moreShow less 3.11.2-6+deb12u53.11.2-6+deb12u63.11.2-6+deb12u73.11.2-6+deb12u83.11.2-6+deb12u93.11.3-13.11.3-23.11.4-13.11.5-13.11.5-23.11.5-33.11.6-13.11.6-23.11.6-33.11.6-3~hurd.23.11.7-13.11.7-23.11.8-13.11.8-1.1~exp13.11.8-1.1~exp23.11.8-23.11.8-33.11.8-3+hurd.13.11.9-1	None known
`python3.13` Debian:13	All versions, plus listed versions 3.13.11-13.13.12-13.13.14-13.13.15-13.13.18-1 Show 10 moreShow less 3.13.5-23.13.5-2+deb13u13.13.5-2+deb13u23.13.5-2+deb13u33.13.5-2+deb13u43.13.5-2+deb13u53.13.6-13.13.7-13.13.8-13.13.9-1	None known
`python3.14` Debian:14	All versions, plus listed versions 3.14.0-13.14.0-23.14.0-33.14.0-43.14.0-5 Show 27 moreShow less 3.14.0~a7-13.14.0~b1-13.14.0~b2-13.14.0~b3-13.14.0~b4-13.14.0~rc1-13.14.0~rc2-13.14.0~rc3-13.14.10-13.14.2-13.14.3-13.14.3-23.14.3-33.14.3-43.14.3-53.14.4-13.14.4-23.14.5-13.14.5~rc1-13.14.6-13.14.7-13.14.7-23.14.7-33.14.7-43.14.7-53.14.8-13.14.9-1	None known
`python3.15` Debian:14	All versions, plus listed versions 3.15.0-13.15.0~a8-13.15.0~a8-23.15.0~b1-13.15.0~b1-2 Show 12 moreShow less 3.15.0~b1-33.15.0~b2-13.15.0~b3-13.15.0~b4-13.15.0~rc1-13.15.0~rc2-13.15.0~rc2-23.15.0~rc2-33.15.0~rc3-13.15.0~rc3-23.15.1-13.15.2-1	None known
`python2.7` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 2.7.5-8ubuntu32.7.5-8ubuntu42.7.6-22.7.6-2ubuntu12.7.6-3 Show 35 moreShow less 2.7.6-3ubuntu12.7.6-42.7.6-4ubuntu12.7.6-52.7.6-72.7.6-82.7.6-8ubuntu0.22.7.6-8ubuntu0.32.7.6-8ubuntu0.42.7.6-8ubuntu0.52.7.6-8ubuntu0.6+esm22.7.6-8ubuntu0.6+esm32.7.6-8ubuntu0.6+esm52.7.6-8ubuntu0.6+esm62.7.6-8ubuntu0.6+esm72.7.6-8ubuntu0.6+esm82.7.6-8ubuntu0.6+esm92.7.6-8ubuntu0.6+esm102.7.6-8ubuntu0.6+esm112.7.6-8ubuntu0.6+esm122.7.6-8ubuntu0.6+esm132.7.6-8ubuntu0.6+esm142.7.6-8ubuntu0.6+esm152.7.6-8ubuntu0.6+esm162.7.6-8ubuntu0.6+esm172.7.6-8ubuntu0.6+esm182.7.6-8ubuntu0.6+esm202.7.6-8ubuntu0.6+esm212.7.6-8ubuntu0.6+esm222.7.6-8ubuntu0.6+esm242.7.6-8ubuntu0.6+esm252.7.6-8ubuntu0.6+esm262.7.6-8ubuntu0.6+esm282.7.6-8ubuntu0.6+esm292.7.6-8ubuntu0.6+esm30	None known
`python3.4` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 3.4~b1-0ubuntu33.4~b1-4ubuntu43.4~b1-4ubuntu63.4~b1-5ubuntu23.4~b2-1 Show 29 moreShow less 3.4~b3-1ubuntu13.4~rc1-1build13.4~rc2-13.4~rc3-0ubuntu13.4.0-13.4.0-2ubuntu13.4.0-2ubuntu1.13.4.3-1ubuntu1~14.04.13.4.3-1ubuntu1~14.04.33.4.3-1ubuntu1~14.04.43.4.3-1ubuntu1~14.04.53.4.3-1ubuntu1~14.04.63.4.3-1ubuntu1~14.04.73.4.3-1ubuntu1~14.04.7+esm23.4.3-1ubuntu1~14.04.7+esm43.4.3-1ubuntu1~14.04.7+esm63.4.3-1ubuntu1~14.04.7+esm73.4.3-1ubuntu1~14.04.7+esm83.4.3-1ubuntu1~14.04.7+esm103.4.3-1ubuntu1~14.04.7+esm113.4.3-1ubuntu1~14.04.7+esm123.4.3-1ubuntu1~14.04.7+esm133.4.3-1ubuntu1~14.04.7+esm143.4.3-1ubuntu1~14.04.7+esm153.4.3-1ubuntu1~14.04.7+esm163.4.3-1ubuntu1~14.04.7+esm173.4.3-1ubuntu1~14.04.7+esm193.4.3-1ubuntu1~14.04.7+esm203.4.3-1ubuntu1~14.04.7+esm21	None known
`python3.5` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 3.5.2-2ubuntu0~16.04.4~14.04.13.5.2-2ubuntu0~16.04.4~14.04.1+esm13.5.2-2ubuntu0~16.04.4~14.04.1+esm33.5.2-2ubuntu0~16.04.4~14.04.1+esm43.5.2-2ubuntu0~16.04.4~14.04.1+esm5 Show 6 moreShow less 3.5.2-2ubuntu0~16.04.4~14.04.1+esm63.5.2-2ubuntu0~16.04.4~14.04.1+esm73.5.2-2ubuntu0~16.04.4~14.04.1+esm83.5.2-2ubuntu0~16.04.4~14.04.1+esm93.5.2-2ubuntu0~16.04.4~14.04.1+esm103.5.2-2ubuntu0~16.04.4~14.04.1+esm11	None known
`python2.7` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 2.7.10-4ubuntu12.7.10-4ubuntu22.7.11-22.7.11-32.7.11-4 Show 37 moreShow less 2.7.11-62.7.11-72.7.11-7ubuntu12.7.12-1~16.042.7.12-1ubuntu0~16.04.12.7.12-1ubuntu0~16.04.22.7.12-1ubuntu0~16.04.32.7.12-1ubuntu0~16.04.42.7.12-1ubuntu0~16.04.82.7.12-1ubuntu0~16.04.92.7.12-1ubuntu0~16.04.112.7.12-1ubuntu0~16.04.122.7.12-1ubuntu0~16.04.132.7.12-1ubuntu0~16.04.142.7.12-1ubuntu0~16.04.162.7.12-1ubuntu0~16.04.182.7.12-1ubuntu0~16.04.18+esm12.7.12-1ubuntu0~16.04.18+esm22.7.12-1ubuntu0~16.04.18+esm32.7.12-1ubuntu0~16.04.18+esm42.7.12-1ubuntu0~16.04.18+esm52.7.12-1ubuntu0~16.04.18+esm62.7.12-1ubuntu0~16.04.18+esm72.7.12-1ubuntu0~16.04.18+esm82.7.12-1ubuntu0~16.04.18+esm92.7.12-1ubuntu0~16.04.18+esm102.7.12-1ubuntu0~16.04.18+esm112.7.12-1ubuntu0~16.04.18+esm122.7.12-1ubuntu0~16.04.18+esm132.7.12-1ubuntu0~16.04.18+esm152.7.12-1ubuntu0~16.04.18+esm162.7.12-1ubuntu0~16.04.18+esm172.7.12-1ubuntu0~16.04.18+esm182.7.12-1ubuntu0~16.04.18+esm192.7.12-1ubuntu0~16.04.18+esm202.7.12-1ubuntu0~16.04.18+esm212.7.12-1ubuntu0~16.04.18+esm22	None known

Show 15 moreShow less

Affected packages
Package	Affected	Fixed
`python3.5` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 3.5.0-33.5.0-3ubuntu13.5.1~rc1-2ubuntu13.5.1-13.5.1-2 Show 43 moreShow less 3.5.1-33.5.1-53.5.1-6ubuntu13.5.1-6ubuntu23.5.1-9ubuntu13.5.1-103.5.2-2~16.013.5.2-2~16.043.5.2-2ubuntu0~16.04.13.5.2-2ubuntu0~16.04.23.5.2-2ubuntu0~16.04.33.5.2-2ubuntu0~16.04.43.5.2-2ubuntu0~16.04.53.5.2-2ubuntu0~16.04.83.5.2-2ubuntu0~16.04.93.5.2-2ubuntu0~16.04.103.5.2-2ubuntu0~16.04.113.5.2-2ubuntu0~16.04.123.5.2-2ubuntu0~16.04.133.5.2-2ubuntu0~16.04.13+esm13.5.2-2ubuntu0~16.04.13+esm23.5.2-2ubuntu0~16.04.13+esm33.5.2-2ubuntu0~16.04.13+esm53.5.2-2ubuntu0~16.04.13+esm63.5.2-2ubuntu0~16.04.13+esm73.5.2-2ubuntu0~16.04.13+esm83.5.2-2ubuntu0~16.04.13+esm93.5.2-2ubuntu0~16.04.13+esm103.5.2-2ubuntu0~16.04.13+esm113.5.2-2ubuntu0~16.04.13+esm123.5.2-2ubuntu0~16.04.13+esm133.5.2-2ubuntu0~16.04.13+esm143.5.2-2ubuntu0~16.04.13+esm153.5.2-2ubuntu0~16.04.13+esm163.5.2-2ubuntu0~16.04.13+esm173.5.2-2ubuntu0~16.04.13+esm183.5.2-2ubuntu0~16.04.13+esm193.5.2-2ubuntu0~16.04.13+esm203.5.2-2ubuntu0~16.04.13+esm213.5.2-2ubuntu0~16.04.13+esm223.5.2-2ubuntu0~16.04.13+esm233.5.2-2ubuntu0~16.04.13+esm243.5.2-2ubuntu0~16.04.13+esm25	None known
`python2.7` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 2.7.14-2ubuntu22.7.14-42.7.14-62.7.14-72.7.14-8 Show 31 moreShow less 2.7.15~rc1-12.7.15~rc1-1ubuntu0.12.7.15-4ubuntu4~18.042.7.15-4ubuntu4~18.04.12.7.15-4ubuntu4~18.04.22.7.17-1~18.042.7.17-1~18.04ubuntu12.7.17-1~18.04ubuntu1.12.7.17-1~18.04ubuntu1.22.7.17-1~18.04ubuntu1.32.7.17-1~18.04ubuntu1.52.7.17-1~18.04ubuntu1.62.7.17-1~18.04ubuntu1.72.7.17-1~18.04ubuntu1.82.7.17-1~18.04ubuntu1.102.7.17-1~18.04ubuntu1.112.7.17-1~18.04ubuntu1.132.7.17-1~18.04ubuntu1.13+esm12.7.17-1~18.04ubuntu1.13+esm22.7.17-1~18.04ubuntu1.13+esm32.7.17-1~18.04ubuntu1.13+esm42.7.17-1~18.04ubuntu1.13+esm52.7.17-1~18.04ubuntu1.13+esm62.7.17-1~18.04ubuntu1.13+esm72.7.17-1~18.04ubuntu1.13+esm82.7.17-1~18.04ubuntu1.13+esm102.7.17-1~18.04ubuntu1.13+esm112.7.17-1~18.04ubuntu1.13+esm122.7.17-1~18.04ubuntu1.13+esm132.7.17-1~18.04ubuntu1.13+esm142.7.17-1~18.04ubuntu1.13+esm15	None known
`python3.6` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.6.3-1ubuntu13.6.4~rc1-13.6.4~rc1-23.6.4-13.6.4-2 Show 31 moreShow less 3.6.4-3build13.6.4-43.6.5~rc1-13.6.5-33.6.6-1~18.043.6.7-1~18.043.6.8-1~18.04.13.6.8-1~18.04.23.6.8-1~18.04.33.6.9-1~18.043.6.9-1~18.04ubuntu13.6.9-1~18.04ubuntu1.13.6.9-1~18.04ubuntu1.33.6.9-1~18.04ubuntu1.43.6.9-1~18.04ubuntu1.63.6.9-1~18.04ubuntu1.73.6.9-1~18.04ubuntu1.83.6.9-1~18.04ubuntu1.93.6.9-1~18.04ubuntu1.103.6.9-1~18.04ubuntu1.123.6.9-1~18.04ubuntu1.133.6.9-1~18.04ubuntu1.13+esm13.6.9-1~18.04ubuntu1.13+esm23.6.9-1~18.04ubuntu1.13+esm33.6.9-1~18.04ubuntu1.13+esm43.6.9-1~18.04ubuntu1.13+esm53.6.9-1~18.04ubuntu1.13+esm63.6.9-1~18.04ubuntu1.13+esm73.6.9-1~18.04ubuntu1.13+esm83.6.9-1~18.04ubuntu1.13+esm93.6.9-1~18.04ubuntu1.13+esm10	None known
`python3.7` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.7.0~a2-13.7.0~a3-13.7.0~a3-23.7.0~a3-33.7.0~a4-1 Show 21 moreShow less 3.7.0~b1-13.7.0~b1-1build13.7.0~b2-13.7.0~b3-13.7.0-1~18.043.7.1-1~18.043.7.3-2~18.04.13.7.5-2~18.043.7.5-2~18.04.43.7.5-2ubuntu1~18.04.23.7.5-2ubuntu1~18.04.2+esm13.7.5-2ubuntu1~18.04.2+esm23.7.5-2ubuntu1~18.04.2+esm33.7.5-2ubuntu1~18.04.2+esm43.7.5-2ubuntu1~18.04.2+esm53.7.5-2ubuntu1~18.04.2+esm63.7.5-2ubuntu1~18.04.2+esm73.7.5-2ubuntu1~18.04.2+esm83.7.5-2ubuntu1~18.04.2+esm93.7.5-2ubuntu1~18.04.2+esm103.7.5-2ubuntu1~18.04.2+esm11	None known
`python3.8` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.8.0-3~18.043.8.0-3~18.04.13.8.0-3ubuntu1~18.04.23.8.0-3ubuntu1~18.04.2+esm13.8.0-3ubuntu1~18.04.2+esm2 Show 9 moreShow less 3.8.0-3ubuntu1~18.04.2+esm33.8.0-3ubuntu1~18.04.2+esm43.8.0-3ubuntu1~18.04.2+esm53.8.0-3ubuntu1~18.04.2+esm63.8.0-3ubuntu1~18.04.2+esm73.8.0-3ubuntu1~18.04.2+esm83.8.0-3ubuntu1~18.04.2+esm93.8.0-3ubuntu1~18.04.2+esm103.8.0-3ubuntu1~18.04.2+esm11	None known
`python3.8` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 3.8.0-13.8.0-23.8.0-33.8.0-43.8.0-5 Show 34 moreShow less 3.8.1-2ubuntu33.8.2~rc1-1ubuntu13.8.2-13.8.2-1ubuntu13.8.2-1ubuntu1.13.8.2-1ubuntu1.23.8.5-1~20.043.8.5-1~20.04.23.8.5-1~20.04.33.8.10-0ubuntu1~20.043.8.10-0ubuntu1~20.04.13.8.10-0ubuntu1~20.04.23.8.10-0ubuntu1~20.04.43.8.10-0ubuntu1~20.04.53.8.10-0ubuntu1~20.04.63.8.10-0ubuntu1~20.04.73.8.10-0ubuntu1~20.04.83.8.10-0ubuntu1~20.04.93.8.10-0ubuntu1~20.04.103.8.10-0ubuntu1~20.04.113.8.10-0ubuntu1~20.04.123.8.10-0ubuntu1~20.04.133.8.10-0ubuntu1~20.04.143.8.10-0ubuntu1~20.04.153.8.10-0ubuntu1~20.04.163.8.10-0ubuntu1~20.04.173.8.10-0ubuntu1~20.04.183.8.10-0ubuntu1~20.04.18+esm13.8.10-0ubuntu1~20.04.18+esm23.8.10-0ubuntu1~20.04.18+esm33.8.10-0ubuntu1~20.04.18+esm43.8.10-0ubuntu1~20.04.18+esm53.8.10-0ubuntu1~20.04.18+esm63.8.10-0ubuntu1~20.04.18+esm7	None known
`python2.7` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 2.7.17~rc1-12.7.17-12.7.17-1ubuntu52.7.17-1ubuntu62.7.18~rc1-2 Show 22 moreShow less 2.7.18-1~20.042.7.18-1~20.04.12.7.18-1~20.04.1+esm12.7.18-1~20.04.32.7.18-1~20.04.3+esm12.7.18-1~20.04.42.7.18-1~20.04.4+esm12.7.18-1~20.04.4+esm22.7.18-1~20.04.4+esm32.7.18-1~20.04.52.7.18-1~20.04.5+esm12.7.18-1~20.04.5+esm22.7.18-1~20.04.62.7.18-1~20.04.6+esm12.7.18-1~20.04.72.7.18-1~20.04.7+esm32.7.18-1~20.04.7+esm42.7.18-1~20.04.7+esm62.7.18-1~20.04.7+esm72.7.18-1~20.04.7+esm82.7.18-1~20.04.7+esm92.7.18-1~20.04.7+esm10	None known
`python3.9` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 3.9.0~rc1-1~20.043.9.0-5~20.043.9.5-3~20.04.13.9.5-3ubuntu0~20.04.13.9.5-3ubuntu0~20.04.1+esm1 Show 10 moreShow less 3.9.5-3ubuntu0~20.04.1+esm23.9.5-3ubuntu0~20.04.1+esm33.9.5-3ubuntu0~20.04.1+esm43.9.5-3ubuntu0~20.04.1+esm53.9.5-3ubuntu0~20.04.1+esm63.9.5-3ubuntu0~20.04.1+esm73.9.5-3ubuntu0~20.04.1+esm83.9.5-3ubuntu0~20.04.1+esm93.9.5-3ubuntu0~20.04.1+esm103.9.5-3ubuntu0~20.04.1+esm11	None known
`python3.10` Ubuntu:22.04:LTS	All versions, plus listed versions 3.10.0-23.10.0-33.10.0-43.10.0-53.10.0-5build1 Show 30 moreShow less 3.10.1-13.10.1-23.10.2-13.10.2-53.10.2-73.10.3-13.10.4-33.10.4-3ubuntu0.13.10.6-1~22.043.10.6-1~22.04.13.10.6-1~22.04.23.10.6-1~22.04.2ubuntu13.10.6-1~22.04.2ubuntu1.13.10.12-1~22.04.23.10.12-1~22.04.33.10.12-1~22.04.43.10.12-1~22.04.53.10.12-1~22.04.63.10.12-1~22.04.73.10.12-1~22.04.83.10.12-1~22.04.93.10.12-1~22.04.103.10.12-1~22.04.113.10.12-1~22.04.123.10.12-1~22.04.133.10.12-1~22.04.143.10.12-1~22.04.153.10.12-1~22.04.163.10.12-1~22.04.173.10.12-1~22.04.18	None known
`python2.7` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 2.7.18-8build12.7.18-132.7.18-13ubuntu12.7.18-13ubuntu1.12.7.18-13ubuntu1.1+esm2 Show 16 moreShow less 2.7.18-13ubuntu1.22.7.18-13ubuntu1.2+esm12.7.18-13ubuntu1.2+esm22.7.18-13ubuntu1.2+esm32.7.18-13ubuntu1.32.7.18-13ubuntu1.3+esm12.7.18-13ubuntu1.42.7.18-13ubuntu1.4+esm12.7.18-13ubuntu1.52.7.18-13ubuntu1.5+esm22.7.18-13ubuntu1.5+esm32.7.18-13ubuntu1.5+esm52.7.18-13ubuntu1.5+esm62.7.18-13ubuntu1.5+esm72.7.18-13ubuntu1.5+esm82.7.18-13ubuntu1.5+esm9	None known
`python3.11` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 3.11.0~rc1-1~22.043.11.0~rc1-1~22.04.1~esm13.11.0~rc1-1~22.04.1~esm23.11.0~rc1-1~22.04.1~esm33.11.0~rc1-1~22.04.1~esm4 Show 8 moreShow less 3.11.0~rc1-1~22.04.1~esm53.11.0~rc1-1~22.04.1~esm63.11.0~rc1-1~22.04.1~esm73.11.0~rc1-1~22.04.1~esm83.11.0~rc1-1~22.04.1~esm93.11.0~rc1-1~22.04.13.11.0~rc1-1~22.04.1+esm13.11.0~rc1-1~22.04.1+esm2	None known
`python3.12` Ubuntu:24.04:LTS	All versions, plus listed versions 3.12.0-13.12.0-53.12.0-63.12.0-73.12.1-2 Show 21 moreShow less 3.12.2-13.12.2-4build33.12.2-4build43.12.2-5ubuntu33.12.3-13.12.3-1ubuntu0.13.12.3-1ubuntu0.23.12.3-1ubuntu0.33.12.3-1ubuntu0.43.12.3-1ubuntu0.53.12.3-1ubuntu0.63.12.3-1ubuntu0.73.12.3-1ubuntu0.83.12.3-1ubuntu0.93.12.3-1ubuntu0.103.12.3-1ubuntu0.113.12.3-1ubuntu0.123.12.3-1ubuntu0.133.12.3-1ubuntu0.153.12.3-1ubuntu0.163.12.3-1ubuntu0.17	None known
`python3.14` Ubuntu:26.10	All versions, plus listed versions 3.14.4-13.14.6-13.14.7-1ubuntu13.14.7-4ubuntu13.14.7-4ubuntu23.14.7-5ubuntu13.14.8-1ubuntu1	None known
`python3.15` Ubuntu:26.10	All versions, plus listed versions 3.15.0~b1-33.15.0~rc1-13.15.0~rc2-13.15.0~rc2-2ubuntu13.15.0~rc2-2ubuntu23.15.0~rc2-3ubuntu13.15.0~rc3-2ubuntu13.15.0-1ubuntu1	None known
`python3.14` Ubuntu:26.04:LTS	All versions, plus listed versions 3.14.0-13.14.0-23.14.0-43.14.2-13.14.3-1 Show 6 moreShow less 3.14.3-23.14.3-33.14.3-53.14.4-13.14.4-1ubuntu0.13.14.4-1ubuntu0.2	None known

History

History
Recorded	Changed	Sources
Nov 4, 2026	affected, aliases, references	OSV
Nov 4, 2026	facts	OSV
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

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

In short

CVE-2026-116566 is a medium vulnerability (CVSS 5.3) in Python Software Foundation Cpython, published October 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.26%, the 17th percentile. No source names a fixed version.

References

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