CVE-2026-77467Public exploitNetwork attack vectorHinoki check available

Authenticated denial of service via oversized PDF pages

Published Oct 15, 2026 · Updated Oct 15, 2026

CPU exhaustion in Lychee before 7.7.0 allows remote authenticated users to stall image processing via crafted PDF uploads. ImagickHandler::loadPdf() passes oversized PDF page dimensions to Imagick::readImage() without an effective pre-render limit, consuming CPU before rendering fails. Upload privileges and Ghostscript-backed PDF support are required; synchronous processing occupies a web worker, while asynchronous processing delays the shared image queue, without a demonstrated sandbox escape.

CVSS severity7.1
High
EPSS probability0.27%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

CPU exhaustion in Lychee before 7.7.0 allows remote authenticated users to stall image processing via crafted PDF uploads. ImagickHandler::loadPdf() passes oversized PDF page dimensions to Imagick::readImage() without an effective pre-render limit, consuming CPU before rendering fails. Upload privileges and Ghostscript-backed PDF support are required; synchronous processing occupies a web worker, while asynchronous processing delays the shared image queue, without a demonstrated sandbox escape.

The record

CVE
CVE-2026-77467
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
LycheeOrg
Product
Lychee
Classifications
CWE-400, CWE-770, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=< 7.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

LycheeOrg · Lycheeversion=< 7.7.0

Published CVSS scores

7.1GitHub CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

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

Technologies

Your stack

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Your stack

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