How severe is CVE-2026-33165?

CVE-2026-33165 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-33165 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33165?

CVE-2026-33165 affects Struktur Libde265. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33165?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-33165 have an EU (EUVD) identifier?

Yes. CVE-2026-33165 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13812.

When was CVE-2026-33165 published?

CVE-2026-33165 was published on 2026-03-20 and last updated on 2026-06-17.

CVE-2026-33165

CVE-2026-33165 is a medium-severity vulnerability in Struktur Libde265 with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-13812
Weakness: CWE-787
Affected product: Struktur Libde265
Published: 2026-03-20
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2026-33165?: 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.
How severe is CVE-2026-33165?: CVE-2026-33165 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-33165 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33165?: CVE-2026-33165 affects Struktur Libde265. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33165?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-33165 have an EU (EUVD) identifier?: Yes. CVE-2026-33165 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-13812.
When was CVE-2026-33165 published?: CVE-2026-33165 was published on 2026-03-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:struktur:libde265:*:*:*:*:*:*:*:*

More vulnerabilities in Struktur Libde265

CVE-2022-1253 — Critical (CVSS 9.8): Heap-based Buffer Overflow in GitHub repository strukturag/libde265 prior to and including 1.0.8. The fix is…
CVE-2023-49468 — High (CVSS 8.8): Libde265 v1.0.14 was discovered to contain a global buffer overflow vulnerability in the read_coding_unit function at…
CVE-2023-49467 — High (CVSS 8.8): Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the…
CVE-2023-49465 — High (CVSS 8.8): Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the…
CVE-2023-27103 — High (CVSS 8.8): Libde265 v1.0.11 was discovered to contain a heap buffer overflow via the function derive_collocated_motion_vectors at…
CVE-2020-21598 — High (CVSS 8.8): libde265 v1.0.4 contains a heap buffer overflow in the ff_hevc_put_unweighted_pred_8_sse function, which can be…

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