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CVE Record

CVE-2021-29390: libjpeg-turbo version 2.0.90 has a heap-based buffer over-read (2 bytes) in decompress_smooth_data in jdcoe...

libjpeg-turbo version 2.0.90 has a heap-based buffer over-read (2 bytes) in decompress_smooth_data in jdcoefct.c.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-29390 is a reported 2-byte heap buffer over-read in libjpeg-turbo 2.0.90 while decompressing JPEG data. Business risk is most relevant where systems process untrusted images. The source bundle does not provide CVSS, confirmed impact, or active exploitation evidence.

Executive priority

Treat this as a targeted dependency patching item, not an emergency based on available evidence. Escalate priority for public upload services, mail gateways, media pipelines, or other systems decoding untrusted JPEGs.

Technical view

The issue is described in libjpeg-turbo 2.0.90 in decompress_smooth_data within jdcoefct.c. It is a small heap-based over-read during JPEG decompression. Fedora advisories reference downstream package updates, but the bundle does not name a universal fixed upstream version or detailed exploitability.

Likely exposure

Exposure is likely in applications, servers, desktops, or containers using libjpeg-turbo 2.0.90 or affected distro packages to decode JPEGs, especially user-uploaded or externally supplied images.

Exploitation context

The bundle provides no KEV listing and no cited evidence of active exploitation. The likely trigger context is processing malformed or crafted JPEG input, but practical exploitability is not established here.

Researcher notes

Evidence is limited: no CVSS, CWE, CPE, PoC, or exploit status is provided. The strongest facts are the CVE description, the referenced jdcoefct.c location, Red Hat tracking, and Fedora package advisories.

Mitigation direction

  • Check vendor advisories for fixed libjpeg-turbo packages.
  • Update affected Fedora or OS packages where vendor fixes exist.
  • Prioritize systems processing untrusted JPEG uploads or attachments.
  • Isolate image parsing paths where immediate patching is delayed.
  • Monitor image-processing services for crashes or memory-safety alerts.

Validation and detection

  • Inventory SBOMs and package manifests for libjpeg-turbo 2.0.90.
  • Check distro package advisories against deployed versions.
  • Identify services that decode externally supplied JPEG files.
  • Confirm patched packages are deployed through normal change control.
  • Review crash telemetry for JPEG decompression failures.
Prepared
Confidence
medium
Sources
8

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2021-29390 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
7Source 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

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.