CVE-2026-75421

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

4.0 MediumFix available

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: Low

Exploit likelihood

0.16%Unchanged since Aug 26, 2026

What each source reports

CVE List Score used 4.0

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Record: CVE-2026-75421
CVSS 3.1: 4.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-121
Updated: 2026-11-02

EUVDEUVD-2026-66178 4.0

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Record: EUVD-2026-66178
CVSS 3.1: 4.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

GitHub AdvisoriesGHSA-8w4g-6qwv-67hv 4.0

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Record: GHSA-8w4g-6qwv-67hv
CVSS 3.1: 4.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-121
Updated: 2026-11-02

NVD 4.0

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Record: CVE-2026-75421
CVSS 3.1: 4.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness: CWE-121
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-75421 4.0

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Record: DEBIAN-CVE-2026-75421
CVSS 3.1: 4.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-75421 4.0

aria2 <=1.37.0 has a stack-buffer-underflow vulnerability in the IOFile::getLine() function.

Record: UBUNTU-CVE-2026-75421
CVSS 3.1: 4.0 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated: 2026-11-02

OSVopenSUSE-SU-2026:11843-1 No score

aria2-1.37.0-3.1 on GA media

These are all security issues fixed in the aria2-1.37.0-3.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:11843-1
Updated: 2026-11-02

OSVopenSUSE-SU-2026:21997-1 No score

Security update for aria2

This update for aria2 fixes the following issues:

Changes in aria2:

CVE-2026-75421: stack buffer underflow in IOFile::getLine() when a line begins with a NUL byte (boo#1276754)
Fix build with Nettle 4.0 [be1caa2d] (bsc#1257934)

Record: openSUSE-SU-2026:21997-1
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`aria2` Debian:12	All versions, plus listed versions 1.36.0-11.36.0-2	None known
`aria2` Debian:13	All versions, plus listed versions 0.10.1-10.10.2+1-10.11.0-10.11.2-10.11.3-1 Show 45 moreShow less 0.12.0-10.12.1-10.13.1+1-10.14.0-10.14.0-1+lenny10.14.0-1+lenny20.7.3-10.8.0-10.8.1-10.9.0-11.0.1-11.1.2-11.10.0-11.10.0-21.10.6-11.10.9-11.11.1-11.11.2-11.12.0-11.12.1-11.12.1-21.13.0-11.14.0-11.14.1-11.14.2-11.14.2-21.15.0-11.15.0-21.15.1-11.15.2-11.16.0-11.16.1-11.17.0-11.18.0-11.18.0-21.18.1-11.18.10-11.18.10-21.18.3-11.18.5-11.18.7-11.18.8-11.19.0-11.2.0-11.21.0-1	None known
`aria2` Debian:14	All versions, plus listed versions 0.10.1-10.10.2+1-10.11.0-10.11.2-10.11.3-1 Show 45 moreShow less 0.12.0-10.12.1-10.13.1+1-10.14.0-10.14.0-1+lenny10.14.0-1+lenny20.7.3-10.8.0-10.8.1-10.9.0-11.0.1-11.1.2-11.10.0-11.10.0-21.10.6-11.10.9-11.11.1-11.11.2-11.12.0-11.12.1-11.12.1-21.13.0-11.14.0-11.14.1-11.14.2-11.14.2-21.15.0-11.15.0-21.15.1-11.15.2-11.16.0-11.16.1-11.17.0-11.18.0-11.18.0-21.18.1-11.18.10-11.18.10-21.18.3-11.18.5-11.18.7-11.18.8-11.19.0-11.2.0-11.21.0-1	None known
`aria2` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 1.17.0-11.18.0-11.18.0-1ubuntu21.18.0-21.18.1-11.18.1-1ubuntu0.1~esm1	None known
`aria2` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.19.0-11.19.0-1build11.19.0-1ubuntu0.1~esm1	None known
`aria2` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 1.32.0-11.32.0-21.33.1-11.33.1-1ubuntu0.1~esm1	None known
`aria2` Ubuntu:20.04:LTS	All versions, plus listed versions 1.34.0-41.35.0-11.35.0-1build1	None known
`aria2` Ubuntu:22.04:LTS	All versions, plus listed versions 1.35.0-31.36.0-1	None known
`aria2` Ubuntu:24.04:LTS	All versions, plus listed versions 1.36.0-21.37.0+debian-11.37.0+debian-1build11.37.0+debian-1build21.37.0+debian-1build3	None known
`aria2` Ubuntu:26.10	All versions, plus listed versions 1.37.0+debian-4	None known
`aria2` Ubuntu:26.04:LTS	All versions, plus listed versions 1.37.0+debian-3build11.37.0+debian-4	None known
`aria2` openSUSE:Tumbleweed	before 1.37.0-3.1	1.37.0-3.1
`aria2` openSUSE:Leap 16.0	before 1.37.0-bp160.2.1	1.37.0-bp160.2.1

History

History
Recorded	Changed	Sources
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-2026-75421 is a medium vulnerability (CVSS 4.0) in aria2, published August 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 4th percentile. Fixed in aria2 1.37.0-3.1.

References

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This page doesn't list everything

Left out here: 70 versions. The JSON record has them.