sumatrapdfreader SumatraPDF up to 3.5.2 on Windows MOBI HuffDic Decompressor AddCdicData out-of-bounds
| CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
|---|---|---|
| 4.8 | $0-$5k | 0.00 |
Summary
A vulnerability classified as problematic has been found in sumatrapdfreader SumatraPDF up to 3.5.2 on Windows. Affected by this issue is the function AddCdicData of the component MOBI HuffDic Decompressor. The manipulation leads to out-of-bounds.
This vulnerability is documented as CVE-2026-25920. The attack can be initiated remotely. There is not any exploit available.
It is recommended to apply a patch to fix this issue.
Details
A vulnerability, which was classified as problematic, has been found in sumatrapdfreader SumatraPDF up to 3.5.2 on Windows. This issue affects the function AddCdicData of the component MOBI HuffDic Decompressor. The manipulation with an unknown input leads to a out-of-bounds vulnerability. Using CWE to declare the problem leads to CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. Impacted is availability. The summary by CVE is:
SumatraPDF is a multi-format reader for Windows. In 3.5.2 and earlier, a heap out-of-bounds read vulnerability exists in SumatraPDF's MOBI HuffDic decompressor. The bounds check in AddCdicData() only validates half the range that DecodeOne() actually accesses. Opening a crafted .mobi file can read nearly (1 << codeLength) bytes beyond the CDIC dictionary buffer, leading to a crash.
It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-25920 since 02/09/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.
Applying the patch 12b6887e9dfff874fe8749bab1bdc53d4ff075b3 is able to eliminate this problem. The bugfix is ready for download at github.com.
Be aware that VulDB is the high quality source for vulnerability data.
Product
Vendor
Name
Version
License
Website
CPE 2.3
CPE 2.2
CVSSv4
VulDB Vector: 🔒VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 4.9VulDB Meta Temp Score: 4.8
VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍
CNA Base Score: 5.5
CNA Vector (GitHub_M): 🔒
CVSSv2
| AV | AC | Au | C | I | A |
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| Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
Exploiting
Class: Out-of-boundsCWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒
Physical: Partially
Local: Yes
Remote: Yes
Availability: 🔒
Status: Not defined
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
| 0-Day | Unlock | Unlock | Unlock | Unlock |
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Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: PatchStatus: 🔍
0-Day Time: 🔒
Patch: 12b6887e9dfff874fe8749bab1bdc53d4ff075b3
Timeline
02/09/2026 CVE reserved02/10/2026 Advisory disclosed
02/10/2026 VulDB entry created
02/21/2026 VulDB entry last update
Sources
Product: github.comAdvisory: GHSA-5mwx-65x7-cffp
Status: Confirmed
CVE: CVE-2026-25920 (🔒)
GCVE (CVE): GCVE-0-2026-25920
GCVE (VulDB): GCVE-100-345071
Entry
Created: 02/10/2026 03:20Updated: 02/21/2026 10:00
Changes: 02/10/2026 03:20 (68), 02/12/2026 11:08 (1), 02/21/2026 10:00 (1)
Complete: 🔍
Cache ID: 216::103
Be aware that VulDB is the high quality source for vulnerability data.
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