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CVE Record

CVE-2021-45928: libjxl b02d6b9, as used in libvips 8.11 through 8.11.2 and other products, has an out-of-bounds write in jx...

libjxl b02d6b9, as used in libvips 8.11 through 8.11.2 and other products, has an out-of-bounds write in jxl::ModularFrameDecoder::DecodeGroup (called from jxl::FrameDecoder::ProcessACGroup and jxl::ThreadPool::RunCallState<jxl::FrameDecoder::ProcessSections).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a memory corruption flaw in libjxl, the JPEG XL library used by libvips 8.11 through 8.11.2 and other products. A malformed image could trigger an out-of-bounds write during decoding. The sources do not provide CVSS scoring, confirmed exploitation, or a complete downstream affected-products list.

Executive priority

Prioritize as an exposure-identification item, especially for public image-processing services. The business risk could be significant if untrusted images are decoded, but urgency cannot be fully scored from the provided sources.

Technical view

CVE-2021-45928 describes an out-of-bounds write in jxl::ModularFrameDecoder::DecodeGroup, reached through JPEG XL frame decoding paths. The CVE names libjxl b02d6b9 and libvips 8.11 through 8.11.2 usage. References point to OSS-Fuzz, a libjxl issue, PR 365, and the v0.5-to-v0.6 comparison.

Likely exposure

Exposure is most likely where services process JPEG XL or user-supplied image content through libjxl or libvips 8.11 to 8.11.2. Downstream products may bundle these libraries, but the source bundle does not enumerate them.

Exploitation context

The source bundle shows OSS-Fuzz discovery and no CISA KEV listing. It does not cite real-world exploitation, public weaponization, or reachable application scenarios. Treat internet-facing image ingestion as higher concern until inventory confirms usage.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit confirmation, or comprehensive affected-products list is provided. Analysis should stay centered on the named decoding function, OSS-Fuzz origin, libjxl b02d6b9, and libvips 8.11 through 8.11.2.

Mitigation direction

  • Inventory libjxl and libvips versions in applications, containers, and build artifacts.
  • Check libjxl, libvips, OS, and package-manager guidance for fixed builds.
  • Move off libvips 8.11 through 8.11.2 where present.
  • Restrict untrusted JPEG XL processing until patched or confirmed unaffected.
  • Prioritize services that automatically decode uploaded or remote images.

Validation and detection

  • Search dependency manifests and SBOMs for libjxl and libvips.
  • Confirm whether libvips versions fall within 8.11 through 8.11.2.
  • Check container and host package inventories for bundled image libraries.
  • Review upload, thumbnailing, and media-processing paths for JPEG XL decoding.
  • Verify remediation by rechecking runtime package versions after updates.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2021-45928 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

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