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Vulnerability details: VCID-tgub-bhkq-wuae
Vulnerability ID VCID-tgub-bhkq-wuae
Aliases CVE-2026-33165
Summary libde265 is an open source implementation of the h.265 video codec. Prior to version 1.0.17, a crafted HEVC bitstream causes an out-of-bounds heap write confirmed by AddressSanitizer. The trigger is a stale ctb_info.log2unitSize after an SPS change where PicWidthInCtbsY and PicHeightInCtbsY stay constant but Log2CtbSizeY changes, causing set_SliceHeaderIndex to index past the allocated image metadata array and write 2 bytes past the end of a heap allocation. This issue has been patched in version 1.0.17.
Status Published
Exploitability 0.5
Weighted Severity 5.0
Risk 2.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-787 Out-of-bounds Write
System Score Found at
epss 6e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-33165
epss 6e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-33165
cvssv3.1 5.5 https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
ssvc Track https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
cvssv3.1 5.5 https://github.com/strukturag/libde265/releases/tag/v1.0.17
ssvc Track https://github.com/strukturag/libde265/releases/tag/v1.0.17
cvssv3.1 5.5 https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
ssvc Track https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-33165
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-33165
1131468 https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1131468
c7891e412106130b83f8e8ea8b7f907e9449b658 https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
GHSA-653q-9f73-8hvg https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
v1.0.17 https://github.com/strukturag/libde265/releases/tag/v1.0.17
No exploits are available.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:45:05Z/ Found at https://github.com/strukturag/libde265/commit/c7891e412106130b83f8e8ea8b7f907e9449b658
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/strukturag/libde265/releases/tag/v1.0.17
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:45:05Z/ Found at https://github.com/strukturag/libde265/releases/tag/v1.0.17
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Found at https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2026-03-24T18:45:05Z/ Found at https://github.com/strukturag/libde265/security/advisories/GHSA-653q-9f73-8hvg
Exploit Prediction Scoring System (EPSS)
Percentile 0.00318
EPSS Score 6e-05
Published At June 13, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:49:25.307691+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/33xxx/CVE-2026-33165.json 38.6.0