CVE-2026-8468

CVE-2026-8468 is a high-severity vulnerability with a CVSS 4.0 base score of 8.2. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-770.

Key facts

• Severity: High (CVSS 4.0 base score 8.2)
• EPSS exploit prediction: 1% (45th percentile)
• Actively exploited: Not listed in CISA KEV
• EU (EUVD) id: EUVD-2026-30266
• Weakness: CWE-770
• Published: 2026-05-14
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-8468?

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.

How severe is CVE-2026-8468?

CVE-2026-8468 has a CVSS 4.0 base score of 8.2, rated high severity.

Is CVE-2026-8468 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (45th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-8468?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-8468 have an EU (EUVD) identifier?

Yes. CVE-2026-8468 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-30266.

When was CVE-2026-8468 published?

CVE-2026-8468 was published on 2026-05-14 and last updated on 2026-06-17.

References

• https://cna.erlef.org/cves/CVE-2026-8466.html
• https://cna.erlef.org/cves/CVE-2026-8468.html
• https://github.com/elixir-plug/plug/commit/2cb7958d33030aa826b0c7404375844d4593d43a
• https://github.com/elixir-plug/plug/commit/33858427c7f2737d560a2e40a0c9a9270d77d1d7
• https://github.com/elixir-plug/plug/commit/aa69c5ece99c40ded88b8c6581ecc86664b0b734
• https://github.com/elixir-plug/plug/commit/d5dfffe25e975585227b1b85d247b0d14164bc45
• https://github.com/elixir-plug/plug/commit/df812a1527bae9e941965e897308a2b8bbf83a94
• https://github.com/elixir-plug/plug/security/advisories/GHSA-468c-vq7p-gh64
• https://osv.dev/vulnerability/EEF-CVE-2026-8468

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