Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-32882

libheif Denial of Service

Strukturag / libheif · All versions (default: unaffected)

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Severity
CVSS 7.1 · High
Confidence
High
Exploit status
Exploited in the wild
EPSS
0.3%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-32882 is an unauthenticated vulnerability affecting Strukturag libheif. libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap buffer over-read in...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

Strukturag / libheif all versions (default: unaffected).

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

libheif is a HEIF and AVIF file format decoder and encoder

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap buffer over-read in HeifPixelImage::overlay() in libheif/pixelimage.cc. When compositing an overlay image (iovl) whose child image has a different bit depth for the alpha channel than for the color channels, the function indexes into the alpha plane using the color channel stride (in_stride) instead of the previously retrieved alpha_stride, causing reads past the end of the alpha buffer (up to 3,123 bytes for a 100×50 image with 10-bit color and 8-bit alpha).

A crafted HEIF file can exploit this to cause a denial of service (crash) or potentially disclose adjacent heap memory through leaked bytes embedded in the decoded output pixels. This issue has been fixed in versionThis issue has been fixed in version 1.22.0.

Red Hat Unaffected
Red Hat Enterprise Linux 10 glycin-loaders
All versions (default: unaffected)
strukturag Affected
libheif
Before 1.22.0
Published
19 May 2026
Exploitation Reported
18 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
Required

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Hacktron

Recorded 18 Sep 2026

A trusted third party reported exploitation.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Hacktron First 2026-09-18 20:28 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.1 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

EPSS

0.3%

Weaknesses

Out-of-bounds Read CWE-125

Recent mention · The Hacker News

Claude Opus 5 Helped Researchers Take Over OpenAI Staff Accounts via Chained Flaws

Swati KhandelwalSep 19, 2026Vulnerability / Artificial Intelligence Three researchers at the security firm Hacktron used Anthropic's Claude Opus 5 to chain two flaws and take over the ChatGPT and Codex accounts of several OpenAI employees, then reach an internal OpenAI code...

Read full advisory

Timeline

From disclosure to observed exploitation

  1. 20:28 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  2. 20:07 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 21:03 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-32882

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-32882",
  "confidence": "High",
  "cvss_score": 7.1,
  "cvss_estimated": false,
  "epss_score": 0.00335,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}