UBUNTU-CVE-2025-59729
- Source
- https://ubuntu.com/security/CVE-2025-59729
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-59729.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2025-59729
- Upstream
- Published
- 2025-10-06T08:15:00Z
- Modified
- 2026-04-22T16:07:23Z
- Severity
-
- 5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N CVSS Calculator
- Ubuntu - medium
- Summary
- [none]
- Details
-
When parsing the header for a DHAV file, there's an integer underflow in offset calculation that leads to reading the duration from before the start of the allocated buffer. If we load a DHAV file that is larger than MAX_DURATION_BUFFER_SIZE bytes (0x100000) for example 0x101000 bytes, then at [0] we have size = 0x101000. At [1] we have end_buffer_size = 0x100000, and at [2] we have end_buffer_pos = 0x1000. The loop then scans backwards through the buffer looking for the dhav tag; when it is found, we'll calculate end_pos based on a 32-bit offset read from the buffer. There is subsequently a check [3] that end_pos is within the section of the file that has been copied into end_buffer, but it only correctly handles the cases where end_pos is before the start of the file or after the section copied into end_buffer, and not the case where end_pos is within the the file, but before the section copied into end_buffer. If we provide such an offset, (end_pos - end_buffer_pos) can underflow, resulting in the subsequent access at [4] occurring before the beginning of the allocation. We recommend upgrading to version 8.0 or beyond.
- References
Affected packages
Ubuntu:Pro:14.04:LTS / libav
Package
- Name
- libav
- Purl
- pkg:deb/ubuntu/libav@6:9.20-0ubuntu0.14.04.1+esm1?arch=source&distro=esm-infra-legacy/trusty
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
6:0.*
6:9.*
Ecosystem specific
{
"binaries": [
{
"binary_name": "libav-tools",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavcodec-extra",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavcodec-extra-54",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavcodec54",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavdevice-extra-53",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavdevice53",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavfilter-extra-3",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavfilter3",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavformat-extra-54",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavformat54",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavresample1",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavutil-extra-52",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libavutil52",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libswscale-extra-2",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
},
{
"binary_name": "libswscale2",
"binary_version": "6:9.20-0ubuntu0.14.04.1+esm1"
}
]
}