Process-memory disclosure via unchecked EXIF tag pointer
Published Apr 11, 2023 · Updated Jun 29, 2026
Out-of-bounds read in libjxl 0.7.0 through 0.8.0 allows attackers to disclose process memory through a crafted JPEG file. FindExifTagPosition advances an EXIF pointer from a file-controlled offset, then reads the tag count without confirming that two bytes remain in the EXIF buffer. The file must be processed by an application using the affected EXIF handler, and demonstrated execution can crash cjxl.
Summary
What happened
Out-of-bounds read in libjxl 0.7.0 through 0.8.0 allows attackers to disclose process memory through a crafted JPEG file. FindExifTagPosition advances an EXIF pointer from a file-controlled offset, then reads the tag count without confirming that two bytes remain in the EXIF buffer. The file must be processed by an application using the affected EXIF handler, and demonstrated execution can crash cjxl.
The record
- CVE
- CVE-2023-0645
- Published
- Apr 11, 2023
- Updated
- Jun 29, 2026
- Vendor
- Go standard library
- Product
- libjxl
- Classifications
- CWE-125, CAPEC-233, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 11, 2023CVE publishedPublication date reported by the CVE source.
- Jun 29, 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=0.7.0 <0.8.1
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- sig_11_src_000122_poc crafted JPEGproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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