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CVE-2026-87864high8.1

IMAP APPEND plus CRLF conversion command injection

Impact

Enabling CURLOPT_CRLF causes curl to advertise the raw input byte count in the IMAP APPEND {N} literal while transmitting line-ending expanded data. The server reads only $N$ bytes for the payload, causing the remaining overflow bytes to be interpreted and executed as pipelined IMAP commands within the authenticated session.

Source excerpt · curl

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.

curl · curl

curl

114 ranges
curl version evidence

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

affected

8.21.0 → through 8.21.0

semver versions

8.20.0 → through 8.20.0

semver versions

8.19.0 → through 8.19.0

semver versions

8.18.0 → through 8.18.0

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8.17.0 → through 8.17.0

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8.16.0 → through 8.16.0

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8.15.0 → through 8.15.0

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8.14.1 → through 8.14.1

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8.14.0 → through 8.14.0

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8.13.0 → through 8.13.0

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8.12.1 → through 8.12.1

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8.12.0 → through 8.12.0

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8.11.1 → through 8.11.1

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8.11.0 → through 8.11.0

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8.10.1 → through 8.10.1

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8.10.0 → through 8.10.0

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8.9.1 → through 8.9.1

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7.88.1 → through 7.88.1

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7.69.1 → through 7.69.1

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7.56.1 → through 7.56.1

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7.54.1 → through 7.54.1

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7.52.1 → through 7.52.1

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7.50.3 → through 7.50.3

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7.50.1 → through 7.50.1

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7.50.0 → through 7.50.0

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7.49.1 → through 7.49.1

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7.47.1 → through 7.47.1

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7.42.1 → through 7.42.1

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7.41.0 → through 7.41.0

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7.40.0 → through 7.40.0

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7.39.0 → through 7.39.0

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7.38.0 → through 7.38.0

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7.37.1 → through 7.37.1

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7.37.0 → through 7.37.0

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7.36.0 → through 7.36.0

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7.35.0 → through 7.35.0

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7.34.0 → through 7.34.0

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7.33.0 → through 7.33.0

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7.32.0 → through 7.32.0

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7.31.0 → through 7.31.0

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7.30.0 → through 7.30.0

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

Enabling CURLOPT_CRLF causes curl to advertise the raw input byte count in the IMAP APPEND {N} literal while transmitting line-ending expanded data. The server reads only $N$ bytes for the payload, causing the remaining overflow bytes to be interpreted and executed as pipelined IMAP commands within the authenticated session.

Inside the record

Evidence available

Package identity · not supplied
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-2026-87864

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-130 ↗

CWE-130 Improper Handling of Length Parameter Inconsistency

CISA-ADP

Related →
Contributing organizations · 2
curl

Assigning organization

2026-10-20
CISA-ADP

Additional data publisher

2026-10-30

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

3 sources
curl.se/docs/CVE-2026-87864.json
Security advisorycurl
curl.se/docs/CVE-2026-87864.html
Security advisorycurl
hackerone.com/reports/3972403
exploitcurl · CISA-ADP