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CVE-2026-115319low2.5

fzf 0.36.0 through 0.74.5 Denial of Service via maskActionContents

Impact

fzf versions 0.36.0 through 0.74.5 contain an inefficient algorithmic complexity vulnerability, allowing local attackers to exhaust the --listen HTTP server. Attackers can send large POST bodies to the unauthenticated localhost port, blocking the server.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

junegunn · VulnCheck

fzf

1 range
VulnCheck version evidence

Package identity

pkg:golang/github.com/junegunn/fzfExplore github.com/junegunn/fzf →

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0.36.0 → through 0.74.5

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

fzf 0.36.0 through 0.74.5 contains an inefficient algorithmic complexity vulnerability in maskActionContents that allows local attackers to exhaust the --listen HTTP server through quadratic string concatenation. Attackers can repeatedly send POST bodies of about 1 MB to the unauthenticated localhost port, blocking the single-threaded server for about 30 seconds each time.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-115319

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-407 ↗

Inefficient Algorithmic Complexity

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:junegunn:fzf:*:*:*:*:*:*:*:*

From (inclusive): 0.36.0

Through (inclusive): 0.74.5

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:junegunn:fzf:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "0.36.0",
            "versionEndIncluding": "0.74.5"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 2
VulnCheck

Assigning organization

2026-10-22
CISA-ADP

Additional data publisher

2026-10-29

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

4 sources
github.com/junegunn/fzf/commit/b412a450538e5f4a1d7057732e75d945dafa18a6
patchVulnCheck
github.com/junegunn/fzf/blob/v0.74.5/src/options.go
technical-descriptionVulnCheck
github.com/junegunn/fzf
productVulnCheck
www.vulncheck.com/advisories/fzf-0.36.0-through-0.74.5-denial-of-service-via-maskactioncontents
third-party-advisoryVulnCheck