CVE-2026-5673 | libtheora AVI File Parser avi_parse_input_file out-of-bounds

VDB-355507 · CVE-2026-5673 · GCVE-0-2026-5673 LIBTHEORA AVI FILE PARSER AVI_PARSE_INPUT_FILE OUT-OF-BOUNDS HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.4 $0-$5k 1.51+ Summaryinfo A vulnerability was found in libtheora. It has been classified as problematic. This impacts the function avi_parse_input_file of the component AVI File Parser. This manipulation causes out-of-bounds. This vulnerability is tracked as CVE-2026-5673. The attack is restricted to local execution. No exploit exists. Detailsinfo A vulnerability was found in libtheora (unknown version). It has been declared as problematic. Affected by this vulnerability is the function avi_parse_input_file of the component AVI File Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: 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. It is possible to read the advisory at access.redhat.com. This vulnerability is known as CVE-2026-5673 since 04/06/2026. The exploitation appears to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Name libtheora CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.4 VulDB Meta Temp Score: 5.4 VulDB Base Score: 5.3 VulDB Temp Score: 5.3 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.6 CNA Vector (redhat): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Out-of-bounds CWE: CWE-125 / CWE-119 CAPEC: 🔒 ATT&CK: 🔒 Physical: Partially Local: Yes Remote: Partially Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 04/06/2026 Advisory disclosed 04/06/2026 +0 days CVE reserved 04/06/2026 +0 days VulDB entry created 04/06/2026 +0 days VulDB entry last update Sourcesinfo Advisory: access.redhat.com Status: Not defined CVE: CVE-2026-5673 (🔒) GCVE (CVE): GCVE-0-2026-5673 GCVE (VulDB): GCVE-100-355507 Entryinfo Created: 04/06/2026 11:56 Changes: 04/06/2026 11:56 (61) Complete: 🔍 Cache ID: 99:855:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸