HOMEVULNERABILITIESCVE-2026-5673
MEDIUM

CVE-2026-5673

CWE-125Published: April 6, 2026· Updated: Apr 7, 2026

5.6
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.6th

Official Description

A flaw was found in libtheora. This heap-based out-of-bounds read vulnerability exists within the AVI (Audio Video Interleave) parser, specifically in the avi_parse_input_file() function. A local attacker could exploit this by tricking a user into opening a specially crafted AVI file containing a truncated header sub-chunk. This could lead to a denial-of-service (application crash) or potentially leak sensitive information from the heap.

NVD Source

Technical Analysis

CVE-2026-5673 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.6.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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All References (3)

→
https://access.redhat.com/security/cve/CVE-2026-5673
→
https://bugzilla.redhat.com/show_bug.cgi?id=2455340
→
https://github.com/xiph/theora/issues/24

Quick Facts

CVE IDCVE-2026-5673
CVSS Score5.6 / 10
SeverityMEDIUM
WeaknessCWE-125
CISA KEVNo
EPSS (30d)0.01%
PublishedApr 6, 2026

Related CVEs (CWE-125)

CVE-2026-34987
9.9
CVE-2026-33642
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CVE-2026-24213
9.8
CVE-2026-42799
9.8
CVE-2025-15646
9.8
CVE-2026-3916
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-5673 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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