Vulnerability record · CVE-2026-5673 · published 6 April 2026

CVE-2026-5673: Xiph theora out-of-bounds read vulnerability

Xiph · Theora

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.

7.1 CVSS 3.1 High EPSS 0.16% · top 95.1% CWE-125 · Out-of-bounds read

7.1CVSS 3.1 base score

0.16%EPSS exploitation probability, 30 days

NoNot in CISA KEV

2Affected product versions listed by NVD

3References, 1 tagged exploit

17 Jun 2026Last modified by NVD

Description

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

Enterprise Linux Redhat

Theora Xiph

References

Link	Tags
https://access.redhat.com/security/cve/CVE-2026-5673	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2455340	Issue TrackingThird Party Advisory
https://github.com/xiph/theora/issues/24	ExploitIssue TrackingThird Party Advisory

Track CVE-2026-5673 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2019-11043PHP-FPM buffer overflow enables remote code executionPHP-FPM in certain configurations writes past allocated buffers into FCGI protocol data space, an out-of-bounds write (CWE-787, CWE-120). It affects …KEVEPSS 100%analysed28 Oct 2019 9.8CVE-2018-14667RichFaces Framework EL injection enables unauthenticated remote code executionRichFaces Framework 3.X through 3.3.4 is vulnerable to Expression Language injection through the UserResource resource. A remote, unauthenticated att…KEVEPSS 74%analysed6 Nov 2018 9.8CVE-2014-7169GNU Bash environment variable function parsing command injection (Shellshock variant)GNU Bash through 4.3 bash43-025 processes trailing strings after malformed function definitions in environment variable values, allowing command inje…KEVEPSS 100%analysed25 Sep 2014 9.8CVE-2014-6271GNU Bash environment variable command injection (ShellShock)GNU Bash through 4.3 processes trailing strings after function definitions in environment variable values, allowing injected commands to run when Bas…KEVEPSS 100%analysed24 Sep 2014 9.0CVE-2021-40438Apache HTTP Server mod_proxy SSRF via crafted URI pathA crafted request URI path can make mod_proxy forward the request to an origin server chosen by the remote user, an SSRF flaw in Apache HTTP Server 2…KEVEPSS 100%analysed16 Sep 2021 8.8CVE-2025-31277Apple WebKit memory corruption via malicious web contentApple WebKit fails to handle memory correctly when processing crafted web content, leading to memory corruption across Safari, iOS, iPadOS, macOS, tv…KEVEPSS 1.6%analysed30 Jul 2025 8.8CVE-2023-5217libvpx VP8 encoding heap buffer overflow exploited via crafted HTMLA heap buffer overflow in the VP8 encoder in libvpx affects Google Chrome before 117.0.5938.132 and libvpx 1.13.1, and is reachable through a crafted…KEVEPSS 49%analysed28 Sep 2023 8.8CVE-2023-32373Apple WebKit use-after-free enables code execution via web contentA use-after-free flaw in Apple's WebKit engine was fixed across watchOS, tvOS, macOS, iOS, iPadOS and Safari. Processing maliciously crafted web cont…KEVEPSS 12%analysed23 Jun 2023

Source: NIST National Vulnerability Database (record CVE-2026-5673), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.