Application crash via oversized IFD buffer allocation
Published Mar 25, 2026 · Updated Mar 25, 2026
Resource exhaustion in golang.org/x/image/tiff before 0.38.0 allows attackers to crash Go applications with a crafted TIFF file. When Decode or DecodeConfig receives an io.Reader without ReaderAt, a 0xFFFFFFFF IFD offset makes buffer.fill grow toward 4 GiB before reaching the eight-byte input's end. The application must pass attacker-controlled TIFF data through that path; the allocation can exhaust memory and terminate the process.
Summary
What happened
Resource exhaustion in golang.org/x/image/tiff before 0.38.0 allows attackers to crash Go applications with a crafted TIFF file. When Decode or DecodeConfig receives an io.Reader without ReaderAt, a 0xFFFFFFFF IFD offset makes buffer.fill grow toward 4 GiB before reaching the eight-byte input's end. The application must pass attacker-controlled TIFF data through that path; the allocation can exhaust memory and terminate the process.
The record
- CVE
- CVE-2026-33809
- Published
- Mar 25, 2026
- Updated
- Mar 25, 2026
- Vendor
- golang.org/x/image
- Product
- golang.org/x/image/tiff
- Classifications
- CWE-770, CWE-434, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 25, 2026CVE publishedPublication date reported by the CVE source.
- Mar 25, 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.
- Affected versionversion=0 <0.38.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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