CVE-2026-44740 | go-billy: Lack of depth and cycle detection in symlink resolution may lead to infinite loops and resource exhaustion

Billy is an interface filesystem abstraction for Go. Prior to versions 5.9.0 and 6.0.0-alpha.1, multiple components may improperly handle crafted or malformed input, resulting in panics, infinite loops, uncontrolled recursion, or excessive resource consumption. These issues arise from insufficient validation and missing safety mechanisms such as cycle detection, recursion limits, or defensive handling of unexpected states when processing untrusted repository data and filesystem structures. This issue has been patched in versions 5.9.0 and 6.0.0-alpha.1.

Published: 2026-06-01 Last update: 2026-06-01 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-44740 is rated Low Risk (30/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.04%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-44740

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-02 — 0.04% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-44740

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]

Weakness enumeration for CVE-2026-44740

GitHub Security Advisory for CVE-2026-44740

GHSA-m3xc-h892-ggx6 · Severity: medium · Ecosystem: go — go-billy: Lack of depth and cycle detection in symlink resolution may lead to infinite loops and resource exhaustion

OS Trackers for CVE-2026-44740

vendor priority summary link
debian not yet assigned CVE-2026-44740 not yet assigned priority: Debian including 2 source packages (golang-github-go-git-go-billy, golang-github-go-git-go-billy-v6), 6 status rows across 4 suites (bookworm, forky, sid, trixie): open 6. https://security-tracker.debian.org/tracker/CVE-2026-44740
suse medium CVE-2026-44740 severity moderate: SUSE including 3 source package names (rclone-1.74.2-1.1, rclone-bash-completion-1.74.2-1.1, rclone-zsh-completion-1.74.2-1.1), 3 product×package rows across 1 product lines (openSUSE Tumbleweed): Fixed 3. https://www.suse.com/security/cve/CVE-2026-44740/
ubuntu medium CVE-2026-44740 medium priority: Ubuntu including 2 source packages (golang-github-go-git-go-billy, golang-github-go-git-go-billy-v6), 10 status rows across 5 suites (jammy, noble, questing, resolute, upstream): needs-triage 6, DNE 4. https://ubuntu.com/security/CVE-2026-44740

Affected software / configurations for CVE-2026-44740

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-44740

cvelogic Threat Intelligence