CVE-2026-33164Public exploitNetwork attack vector

Decoder crash via malformed PPS NAL unit

Published Mar 20, 2026 · Updated Mar 20, 2026

NULL pointer dereference in Struktur AG libde265 before 1.0.17 allows remote attackers to crash decoding via a malformed H.265 PPS NAL unit. During PPS parsing, decoder_context::read_pps_NAL reaches pic_parameter_set::set_derived_values(), where malformed parameter data triggers an invalid read and SIGSEGV. Any application that passes attacker-controlled H.265 input to the library can be interrupted; the advisory demonstrates the condition with dec265 on Ubuntu.

CVSS severity8.7
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in Struktur AG libde265 before 1.0.17 allows remote attackers to crash decoding via a malformed H.265 PPS NAL unit. During PPS parsing, decoder_context::read_pps_NAL reaches pic_parameter_set::set_derived_values(), where malformed parameter data triggers an invalid read and SIGSEGV. Any application that passes attacker-controlled H.265 input to the library can be interrupted; the advisory demonstrates the condition with dec265 on Ubuntu.

The record

CVE
CVE-2026-33164
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Struktur AG
Product
libde265
Classifications
CWE-122, CWE-476, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.0.17

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Struktur AG · libde265version=< 1.0.17

Published CVSS scores

7.5NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-476NULL Pointer Dereference
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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