UBUNTU-CVE-2025-62496

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2025-62496
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-62496.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-62496
Upstream
Published
2025-10-16T16:15:00Z
Modified
2026-05-20T16:23:39Z
Severity
  • 7.1 (High) CVSS_V4 - CVSS:4.0/AV:A/AC:H/AT:P/PR:L/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 vulnerability exists in the QuickJS engine's BigInt string parsing logic (js_bigint_from_string) when attempting to create a BigInt from a string with an excessively large number of digits. The function calculates the necessary number of bits (n_bits) required to store the BigInt using the formula: $$\text{n_bits} = (\text{n_digits} \times 27 + 7) / 8 \quad (\text{for radix 10})$$ * For large input strings (e.g., $79,536,432$ digits or more for base 10), the intermediate calculation $(\text{n_digits} \times 27 + 7)$ exceeds the maximum value of a standard signed 32-bit integer, resulting in an Integer Overflow. * The resulting n_bits value becomes unexpectedly small or even negative due to this wrap-around. * This flawed n_bits is then used to compute n_limbs, the number of memory "limbs" needed for the BigInt object. Since n_bits is too small, the calculated n_limbs is also significantly underestimated. * The function proceeds to allocate a JSBigInt object using this underestimated n_limbs. * When the function later attempts to write the actual BigInt data into the allocated object, the small buffer size is quickly exceeded, leading to a Heap Out-of-Bounds Write as data is written past the end of the allocated r->tab array.

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
0 Unknown 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-2025-62496.json"

Ubuntu:25.10 / quickjs

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2025-62496.json"

Ubuntu:26.04:LTS / quickjs

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2025-62496.json"