NVD / CVE Program· CNA EEF

CVE-2026-49762: Unbounded integer parsing in the Version module enables CPU and memory exhaustion denial of service

Noroxi assessment

Priority: Monitor (action score 20/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.15% (FIRST EPSS).
Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: elixir-lang elixir 1.20.1, 64e6707233464c3e55a9ca6b44019aed25b0390a, c64417d72fd5c7d09e963ca3ac5fa2b140978d9e; azl3 elixir 1.16.1-1 on Azure Linux 3.0 1.16.1-2; azl3 elixir 1.16.1-2 on Azure Linux 3.0 1.16.1-2.

Low priority for now. Upgrade to elixir-lang elixir 1.20.1, 64e6707233464c3e55a9ca6b44019aed25b0390a, c64417d72fd5c7d09e963ca3ac5fa2b140978d9e; azl3 elixir 1.16.1-1 on Azure Linux 3.0 1.16.1-2; azl3 elixir 1.16.1-2 on Azure Linux 3.0 1.16.1-2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Uncontrolled Resource Consumption vulnerability in the Elixir standard library's Version module allows an attacker who controls a version string to cause a denial of service through CPU and memory exhaustion. The version parser converts numeric version components (major, minor, patch and numeric pre-release/build identifiers) to integers without bounding their length. A single large all-digit component therefore forces a super-linear, non-yielding base-10 to arbitrary-precision integer conversion (String.to_integer/1, i.e. :erlang.binary_to_integer/1) that pins a BEAM scheduler, and a larger component raises an uncaught SystemLimitError that crashes the calling process. A single moderately sized string (around one megabyte) is enough; no authentication is required. This is reachable from the public entry points Version.parse/1, Version.parse!/1, Version.match?/3, Version.compare/2, and Version.parse_requirement/1, which applications routinely call on untrusted input such as HTTP parameters, dependency-manifest fields, and package metadata. This vulnerability is associated with program files lib/version.ex and program routines 'Elixir.Version.Parser':parse_digits/2. This issue affects elixir: from 0.9.3 before 1.20.1.

MediumCVSS 5.1 · v4.0—No exploit Fix available

Denial of service

Published: Jun 9, 2026
Updated: Oct 6, 2026
EPSS: 0.1% · 4th percentile
CWE: CWE-400

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 20 / 40 · 5.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · EEF: 5.1; NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (EEF). Independent of NVD's CPE analysis and usually ahead of it.

elixir-lang elixir
- 0.9.3 and later · before 1.20.1affected · semver
- 057691722eb8cfe315f5606358954a2b173ff7a3 and lateraffected · gitfixed in c64417d72fd5c7d09e963ca3ac5fa2b140978d9e, 64e6707233464c3e55a9ca6b44019aed25b0390a

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	elixir-lang	from 0	—
Debian:14	elixir-lang	before 1.20.1.dfsg-1	1.20.1.dfsg-1

Same product

elixir-lang: all records

Other highest-scoring records for the same primary product.

CVE-2026-115274Unbounded integer parsing in JSON.decode/1 enables CPU and memory exhaustion denial of service in Elixir
27Monitor
CVE-2026-109821Unbounded port parsing in URI.parse/1 enables CPU exhaustion denial of service in Elixir
25Monitor
CVE-2026-75758Unbounded recursion between Inspect.List charlist rendering and List.to_string/1 error path in Elixir
23Monitor

Published before and after this one in the same product

Later →CVE-2026-97209Oct 30, 2026 · Insecure temporary file in mix deps.partition lets a local user execute code in another user's dependency build
21Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
elixir-lang elixir	1.20.1	Vendor (CNA)
elixir-lang elixir	64e6707233464c3e55a9ca6b44019aed25b0390a	Vendor (CNA)
elixir-lang elixir	c64417d72fd5c7d09e963ca3ac5fa2b140978d9e	Vendor (CNA)
azl3 elixir 1.16.1-1 on Azure Linux 3.0	1.16.1-2 · CBL-Mariner Releases	Microsoft (MSRC)
azl3 elixir 1.16.1-2 on Azure Linux 3.0	1.16.1-2 · CBL-Mariner Releases	Microsoft (MSRC)
debian:elixir-lang	1.20.1.dfsg-1 · Debian:14	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Peter Ullrichfinder
José Valimremediation developer
Eric Meadows-Jönssonremediation reviewer
Jonatan Männchen / EEFanalyst

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-109821143 days apartUnbounded port parsing in URI.parse/1 enables CPU exhaustion denial of service in Elixir
25Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability

Attack vector: Local
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: X

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/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

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

Fix✗ → ✓Sep 28, 2026, 10:11 PM UTC

For records you follow, these changes also arrive as notifications. →

References

cna.erlef.org/cves/CVE-2026-49762.html

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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