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NVD / CVE Program· CNA EEF

CVE-2026-8468: Unbounded buffer accumulation in multipart header parsing causes denial of service in plug

Noroxi assessment

Priority: Monitor (action score 32/100)

  • 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: 0.62% (FIRST EPSS).
  • Anyone who can reach it over the internet 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-plug plug 1.15.4, 1.16.3, 1.17.1.

Low priority for now. Upgrade to elixir-plug plug 1.15.4, 1.16.3, 1.17.1 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

Allocation of Resources Without Limits or Throttling vulnerability in plug_project plug allows denial of service via unbounded buffer accumulation in multipart header parsing. 'Elixir.Plug.Conn':read_part_headers/2 in lib/plug/conn.ex does not obey its :length parameter. There is no upper bound on the size of the accumulated buffer. By contrast, the sibling function read_part_body has an explicit byte_size(acc) > length guard that stops accumulation once a limit is reached. No such guard exists in read_part_headers. An unauthenticated remote attacker can exhaust server memory by sending a crafted multipart/form-data request, causing a denial of service. This issue affects plug from 1.4.0 before 1.15.4, 1.16.3, 1.17.1, 1.18.2, and 1.19.2.

HighCVSS 8.2 · v4.0—No exploit Fix available
Published
May 14, 2026
Updated
Oct 26, 2026
EPSS
0.6% · 49th percentile

Report tools

JSON

Action score

32

Monitor

Low priority for now.

CVSS
32 / 40 · 8.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · EEF
8.2
NVD has not scored this yet; the score shown is the CNA’s.

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

Follow CVE-2026-8468

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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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-plug plug

    • 1.4.0 and later · before 1.15.4affected · semver
    • 1.16.0 and later · before 1.16.3affected · semver
    • 1.17.0 and later · before 1.17.1affected · semver
    • 1.18.0 and later · before 1.18.2affected · semver
    • 1.19.0 and later · before 1.19.2affected · semver
    • c52b2f32c90bccd718202bafccb5f95594e30183 and lateraffected · gitfixed in 2cb7958d33030aa826b0c7404375844d4593d43a, aa69c5ece99c40ded88b8c6581ecc86664b0b734, d5dfffe25e975585227b1b85d247b0d14164bc45, df812a1527bae9e941965e897308a2b8bbf83a94, 33858427c7f2737d560a2e40a0c9a9270d77d1d7

Package-level exposure

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

EcosystemPackageAffected rangeFix
Hexplugfrom 1.16.0 · before 1.16.31.16.3
Hexplugfrom 1.17.0 · before 1.17.11.17.1
Hexplugfrom 1.18.0 · before 1.18.21.18.2
Hexplugfrom 1.19.0 · before 1.19.21.19.2
Hexplugfrom 1.4.0 · before 1.15.41.15.4

Same product

elixir-plug: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-54892Plug: quadratic-time decoding of nested query/body parameters enables denial of service
    34Monitor
  • CVE-2026-56814Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)
    27Monitor
  • CVE-2026-105963Secret key base exposed in stack trace arguments on wrong-typed Plug.Crypto arguments
    20Monitor

Published before and after this one in the same product

  • Later →CVE-2026-56813Jul 10, 2026 · Cookie attribute injection in Plug.Conn.Cookies.encode/2
    8Monitor

Remediation

Which version to upgrade to

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

Product / packageFixed versionSource
elixir-plug plug1.15.4Vendor (CNA)
elixir-plug plug1.16.3Vendor (CNA)
elixir-plug plug1.17.1Vendor (CNA)
elixir-plug plug1.18.2Vendor (CNA)
elixir-plug plug1.19.2Vendor (CNA)
elixir-plug plug2cb7958d33030aa826b0c7404375844d4593d43aVendor (CNA)
elixir-plug plug33858427c7f2737d560a2e40a0c9a9270d77d1d7Vendor (CNA)
elixir-plug plugaa69c5ece99c40ded88b8c6581ecc86664b0b734Vendor (CNA)
elixir-plug plugd5dfffe25e975585227b1b85d247b0d14164bc45Vendor (CNA)
elixir-plug plugdf812a1527bae9e941965e897308a2b8bbf83a94Vendor (CNA)
Hex:plug1.15.4Package registry (OSV)
Hex:plug1.16.3Package registry (OSV)
Hex:plug1.17.1Package registry (OSV)
Hex:plug1.18.2Package registry (OSV)
Hex:plug1.19.2Package 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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

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.

Variant candidates

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

  • CVE-2026-5681457 days apartPlug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)
    27Monitor

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

  • Anyone who can reach it over the internet 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
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

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

Attack context

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

Change log

  1. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records