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CVE Record

CVE-2020-26208: Heap-buffer-overflow in jhead

JHEAD is a simple command line tool for displaying and some manipulation of EXIF header data embedded in Jpeg images from digital cameras. In affected versions there is a heap-buffer-overflow on jhead-3.04/jpgfile.c:285 ReadJpegSections. Crafted jpeg images can be provided to the user resulting in a program crash or potentially incorrect exif information retrieval. Users are advised to upgrade. There is no known workaround for this issue.

MediumCVSS 5.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

CVE-2020-26208 is a memory safety flaw in jhead, a command-line tool for reading and manipulating JPEG EXIF metadata. A crafted JPEG processed by an affected jhead build can crash the program or cause unreliable EXIF output. The sources advise upgrading and state there is no known workaround.

Executive priority

Treat as a targeted maintenance item, not an emergency. Prioritize exposed image-processing workflows because crashes can disrupt operations and incorrect EXIF data can affect downstream decisions.

Technical view

The flaw is a heap-buffer-overflow in ReadJpegSections in jhead-3.04/jpgfile.c, classified as CWE-787. CVSS 3.1 is 5.3 with local attack vector and low confidentiality, integrity, and availability impact. The provided data does not clearly define every affected version or fixed release.

Likely exposure

Exposure is most likely where jhead processes untrusted or externally supplied JPEG files, including metadata extraction jobs, upload pipelines, forensic workflows, or desktop image tooling.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. Exploitation requires a crafted JPEG being processed by affected jhead; documented outcomes are crash or potentially incorrect EXIF retrieval.

Researcher notes

The strongest evidence is the GHSA advisory, CVE record, issue, Ubuntu bug, and linked commit. Affected version detail is incomplete in the bundle, so validation should rely on vendor or distribution package status rather than assumptions.

Mitigation direction

  • Upgrade jhead according to vendor or distribution guidance.
  • Prioritize systems that process user-supplied or internet-sourced JPEGs.
  • Avoid feeding untrusted JPEGs to affected jhead builds until upgraded.
  • Isolate image metadata processing from sensitive services where feasible.
  • Track distro advisories for backported fixed packages.

Validation and detection

  • Inventory hosts and containers for installed jhead binaries or packages.
  • Identify workflows that invoke jhead on uploaded or external JPEGs.
  • Confirm installed builds include the vendor or distro fix.
  • Review crash reports involving jhead and JPEG metadata processing.
  • Document any temporary compensating controls around image processing.
Prepared
Confidence
medium
Sources
6

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-787: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

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cve · low confidence lookup

CVE-2020-26208 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.3 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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.

1CVSS vectors
0Timeline events
0ADP providers
5Source links

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.3CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L1.83.4Primary CVE score

Vulnerability scoring details

Base CVSS 3.1 score

5.3Medium
CVSS 3.1 vector shape for CVE-2020-26208Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

CWE-787

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

CWE-787 · source CWE mapping

Out-of-bounds Write

Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

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