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CVE-2026-5673— Libtheora: libtheora: denial of service or information disclosure via malformed avi file processing

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Theora是Xiph开源的一个 Theora 视频压缩格式的参考实现。 Theora存在缓冲区错误漏洞，该漏洞源于AVI解析器中avi_parse_input_file函数存在堆越界读取，可能导致拒绝服务或堆敏感信息泄露。

CVSS 5.6 · Medium EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 5

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 any affected
Red Hat Red Hat Enterprise Linux 8 any affected
Red Hat Red Hat Enterprise Linux 9 any affected
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I. Basic Information for CVE-2026-5673

Vulnerability Information
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Vulnerability Title
Libtheora: libtheora: denial of service or information disclosure via malformed avi file processing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
Theora 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Theora是Xiph开源的一个 Theora 视频压缩格式的参考实现。 Theora存在缓冲区错误漏洞，该漏洞源于AVI解析器中avi_parse_input_file函数存在堆越界读取，可能导致拒绝服务或堆敏感信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9

II. Public POCs for CVE-2026-5673

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III. Intelligence Information for CVE-2026-5673

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Vendor Advisories for CVE-2026-5673 (1)

Other References for CVE-2026-5673 (1)

Same Patch Batch · Red Hat · 2026-04-06 · 3 CVEs total

CVE-2026-5704 5.0 MEDIUM Tar: tar: hidden file injection via crafted archives
CVE-2026-37977 3.7 LOW Keycloak: org.keycloak.protocol.oidc.grants.ciba: keycloak: information disclosure via cor

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-5673

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