CVE-2026-84383VulnerabilityPublished 20 Sep 2026Updated 26 Oct 2026

SUSE · Security update for libheif

Affects SUSESource GCVE Database

Mentioned vulnerabilities

Authoritative record:CVE-2026-84383· Critical 9.8

Not known to be exploited · CVSS 9.8 Critical : upgrade SUSE to 1.23.2 as a priority.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score

9.8Critical

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.7% chance of exploitation in 30 days – higher than 53% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 1.23.2

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: High: There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

t = 0 is the CVE’s publication on cve.org

Disclosed: evidence found.
CVE published 18 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

CVE ID reserved
by GitHub, Inc.
1 Sep 202616:27 UTC, 17 days before disclosure
CVE published
on cve.org
18 Sep 202615:55 UTC, t = 0
CISA SSVC assessment
proof of concept public
18 Sep 202616:07 UTC, 12 minutes after disclosure

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade libheif to 1.23.2.

Affected software

Product	Affected	Fixed in
strukturaglibheif	Affected >=1.22.0 <1.23.2	Fixed in 1.23.2

Description

This update for libheif fixes the following issues: - CVE-2026-84383: Heap buffer overflow in scale_nearest_neighbor() via duplicate alpha planes from nested iden/auxl items (bsc#1279443). - CVE-2026-84384: brotli/zlib decompression paths lack output-size limits, allowing decompression-bomb OOM/DoS (bsc#1279445). - CVE-2026-84444: Out-of-bounds write in the unci encoder (bsc#1279448). - CVE-2026-84446: Sequence decode timing-table initialization allows non-terminating loops and unbounded memory, bypassing max_sequence_frames (bsc#1279447). - CVE-2026-84447: Derived-image indirect reference chains and tiled offsets bypass decode caching and MemoryHandle limits, causing CPU/memory amplification DoS (bsc#1279446). - CVE-2026-84448: Heap out-of-bounds read in the inline-mask region API (bsc#1279449). - CVE-2026-84450: image item with `clap` property and an ispe declaring a dimension greater than `INT32_MAX + 1` can lead to a crash via an abort (bsc#1280002). - CVE-2026-84451: crafted HEIF file advertising a 4096 4096 uncompressed tile grid can cause an out-of-bounds read due to an integer overflow (bsc#1280001). - Heap out-of-bounds write in the uncompressed encoder for RRGGBB images with interleaved bit-depth <= 8 (bsc#1273083). - Out-of-bounds read and write in derived-item and pixel-plane handling (bsc#1279444). Changes for libheif: - Update to version 1.23.4: * CVE-2026-XXXXX: The max_items security limit was not enforced for the child boxes of iinf, so a file could declare an unbounded number of items. * CVE-2026-XXXXX: Unbounded recursion in the reference-cycle check crashed the parser on a long chain of derived items, without bound when the item-count limit is disabled. * CVE-2026-XXXXX: Permanent decoder deadlock through a lock-order inversion in parallel grid tile decoding (enabled by default). * CVE-2026-XXXXX: Heap out-of-bounds read in the encoder pluginsi for images whose luma and chroma bit depths differ. * CVE-2026-XXXXX: Unreclaimable memory leak in heif_track_get_next_raw_sequence_sample(). * CVE-2026-XXXXX: Heap out-of-bounds read in the WebCodecs decoder plugin - includes fixes from 1.23.3: * CVE-2026-XXXXX: Heap buffer overflow (write) in the uncompressed (unci) mixed-interleave decoder when the two chroma components declare different bit depths. * CVE-2026-XXXXX: Permanent decoder deadlock through a reference cycle between an image and its alpha auxiliary image. * CVE-2026-XXXXX: Heap out-of-bounds read in the YCbCr 4:2:0 to 16-bit interleaved RGB conversion when the chroma planes have a lower bit depth than luma * CVE-2026-XXXXX: Heap buffer overflow in the SVT-AV1 encoder plugin when encoding a high-bit-depth alpha channel, and a double free on its send-picture error path. * CVE-2026-84451: Incomplete fix: the tile range check of the unci decoder (without icef) could still overflow, allowing an out-of-bounds read * CVE-2026-XXXXX: Heap out-of-bounds read when converting odd- height 4:2:0 frames of an uncompressed (uncv) image sequence to RGB. * CVE-2026-XXXXX: Out-of-bounds read in the RGB to YCbCr identity- matrix color conversion when the R, G, and B planes have different bit depths * CVE-2026-84450: A clap property combined with an oversized ispe reached an assert() in the Fraction arithmetic and aborted the process (incomplete fix). An error is returned instead. * Fix Several smaller findings * Fix Undefined behavior (negative shift) in the HDR bit-depth up-conversion for target bit depths above 16. Such conversions are now rejected. * A number of bug fixes - Update to version 1.23.2: [jsc#PED-16355] * CVE-2026-84383: Heap buffer overflow in scale_nearest_neighbor() via duplicate alpha planes from nested iden/auxl items. (boo#CVE-2026-84383) * Out-of-bounds read and write in derived-item and pixel-plane handling. Through iden and auxl item chains, a crafted file could attach pixel planes whose size differs from the image geometry; crop, scale, and plane-extraction code then indexed those planes with the wrong size. A working code-execution exploit was confirmed. Plane sizes are now validated wherever they are consumed. (boo#1279444) * CVE-2026-84384: brotli/zlib decompression of mime metadata and unci image data had no effective output-size limit, so a decompression bomb could exhaust memory. Decompressed output is now bounded by the security limits. (boo#1279445) * CVE-2026-84447: Chains of derived-image references (grid, iovl, iden) bypassed decode caching and memory limits, causing CPU and memory amplification. (boo#1279446) * CVE-2026-84446: Sequence sample-timing initialization could produce non-terminating decode loops and unbounded memory, bypassing max_sequence_frames. (boo#1279447) * CVE-2026-84444: Out-of-bounds write in the unci encoder when heif_context_add_image_tile() is given a tile whose planes do not match its declared size. (boo#1279448) * CVE-2026-84448: Heap out-of-bounds read in the

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