CVE-2026-55078Network attack vector

Authenticated service crash via unbounded zip expansion

Published Jul 7, 2026 · Updated Jul 7, 2026

Resource exhaustion in affected Coder releases allows remote authenticated users to crash coderd through crafted zip uploads. The POST /api/v2/files handler passes each archive to CreateTarFromZip, which limits individual entries but writes aggregate decompressed output to an unbounded memory buffer. Authenticated file-upload access is required; one highly compressible archive can exhaust memory and repeated requests can keep the service unavailable without disclosing or modifying data.

CVSS severity6.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Resource exhaustion in affected Coder releases allows remote authenticated users to crash coderd through crafted zip uploads. The POST /api/v2/files handler passes each archive to CreateTarFromZip, which limits individual entries but writes aggregate decompressed output to an unbounded memory buffer. Authenticated file-upload access is required; one highly compressible archive can exhaust memory and repeated requests can keep the service unavailable without disclosing or modifying data.

The record

CVE
CVE-2026-55078
Published
Jul 7, 2026
Updated
Jul 7, 2026
Vendor
Coder
Product
Coder
Classifications
CWE-409, CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.17.0, < 2.29.17
  2. Affected versionversion=>= 2.30.0, < 2.32.7
  3. Affected versionversion=>= 2.33.0, < 2.33.8
  4. Affected versionversion=>= 2.34.0, < 2.34.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Coder · Coderversion=>= 2.17.0, < 2.29.17; version=>= 2.30.0, < 2.32.7; version=>= 2.33.0, < 2.33.8; version=>= 2.34.0, < 2.34.2

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-409Improper Handling of Highly Compressed Data (Data Amplification)
CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation Abuse

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo