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CVE-2026-121942

ZBar through 0.23.95 Out-of-Bounds Read via _zbar_sq_decode() in sqcode.c

CVSS score

6.9

EPSS probability

—

Risk score

0.7

Published

4 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

CVE-2026-121942: ZBar Out-of-Bounds Read in _zbar_sq_decode()

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

ZBar through version 0.23.95 contains an out-of-bounds read vulnerability in _zbar_sq_decode() located in zbar/sqcode.c, allowing attackers to read heap memory outside the image buffer using crafted SQ code images [S0].

Why does it matter?

This vulnerability can produce unchecked sample coordinates that crash the decoder and leak bytes into the output [S0].

What should be done?

  • Follow vendor advisories [S0].
  • Keep affected software components updated.
Chain of evidence and sources2 verified claims

ZBar 0.23.95 ve önceki sürümleri, _zbar_sq_decode() fonksiyonunda sınır dışı okuma zafiyeti içermektedir [S0].

S0 · daybreach-canonical

Saldırganlar, özel olarak hazırlanmış SQ kod görselleri ile yığın belleğini okuyabilir [S0].

S0 · daybreach-canonical
Show the technical text from the sources

ZBar through 0.23.95 contains an out-of-bounds read vulnerability in _zbar_sq_decode() in zbar/sqcode.c that allows attackers to read heap memory outside the image buffer via crafted SQ code images. Attackers can supply an image with a skewed SQ code finder pattern near the edge, producing unchecked sample coordinates that crash the decoder and leak bytes into output.

CVSS vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N

CWE: CWE-125

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-121942 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1mchehabzbar View
Total affected vendors: 1|Products: 1

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
6.9CVSS V4_0MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:NCVE CNA
6.9CVSS V40MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:XNVD
6.1CVSS V3_1MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HCVE CNA
6.1CVSS V31MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:HNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-121942 is associated with the following CWEs:

CWE-125: Out-of-bounds Read

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-121942 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureYerel erişim
PermissionsGerekmiyor
User—

Official Sources and Advisories

https://github.com/mchehab/zbar/issues/351vendor-advisoryhttps://hackmd.io/@haindpwn/zbar-sqcode-sampling-oob-readvendor-advisoryhttps://github.com/mchehab/zbar/blob/0.23.95/zbar/sqcode.c#L529-L567vendor-advisoryVulnCheck Advisory: ZBar through 0.23.95 Out-of-Bounds Read via _zbar_sq_decode() in sqcode.cvendor-advisory

CVSS Vector Radar Chart

6.9 / 10
Attack VectorLocalComplexityLowPrivilegesNoneUser Interact.RequiredConfidentialityLowIntegrityNoneAvailabilityHigh

Vulnerability Scoring Details

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
Attack VectorLocal
Attack ComplexityLow
Privileges RequiredNone required
User InteractionP
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)P
Availability (Erişilebilirlik)High

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

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Weakness Type (CWE & CAPEC)

CWE-125

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CVE-2026-121942 · ZBar through 0.23.95 Out-of-Bounds Read…