UBUNTU-CVE-2025-62491

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Source
https://ubuntu.com/security/CVE-2025-62491
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-62491.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-62491
Upstream
Published
2025-10-16T16:15:00Z
Modified
2026-05-20T16:23:39.138622326Z
Severity
  • 8.8 (High) CVSS_V4 - CVSS:4.0/AV:A/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L CVSS Calculator
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A Use-After-Free (UAF) vulnerability exists in the QuickJS engine's standard library when iterating over the global list of unhandled rejected promises (ts->rejectedpromiselist). * The function jsstdpromiserejectioncheck attempts to iterate over the rejectedpromiselist to report unhandled rejections using a standard list loop. * The reason for a promise rejection is processed inside the loop, including calling jsstddumperror1(ctx, rp->reason). * If the promise rejection reason is an Error object that defines a custom property getter (e.g., via Object.defineProperty), this getter is executed during the error dumping process. * The malicious custom getter can execute JavaScript code that calls catch() on the same rejected promise being processed. * Calling catch() internally triggers jsstdpromiserejectiontracker, which then removes and frees the current promise entry (JSRejectedPromiseEntry) from the rejectedpromise_list. * Since the list iteration continues using the now-freed memory pointer (el), the subsequent loop access results in a Use-After-Free condition.

References

Affected packages

Ubuntu:Pro:24.04:LTS / quickjs

Package

Name
quickjs
Purl
pkg:deb/ubuntu/quickjs?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2021.*
2021.03.27-1
2021.03.27-1ubuntu0.1~esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libquickjs",
            "binary_version": "2021.03.27-1ubuntu0.1~esm1"
        },
        {
            "binary_name": "quickjs",
            "binary_version": "2021.03.27-1ubuntu0.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-62491.json"

Ubuntu:25.10 / quickjs

Package

Name
quickjs
Purl
pkg:deb/ubuntu/quickjs?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2024.*
2024.01.13-5
2025.*
2025.04.26-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libquickjs",
            "binary_version": "2025.04.26-1"
        },
        {
            "binary_name": "quickjs",
            "binary_version": "2025.04.26-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-62491.json"

Ubuntu:26.04:LTS / quickjs

Package

Name
quickjs
Purl
pkg:deb/ubuntu/quickjs?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2025.*
2025.04.26-1
2025.04.26-1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libquickjs",
            "binary_version": "2025.04.26-1build1"
        },
        {
            "binary_name": "quickjs",
            "binary_version": "2025.04.26-1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-62491.json"