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CVE-2026-40338— libgphoto2 has OOB read in ptp_unpack_Sony_DPD() enumeration count parsing in ptp-pack.c

Quick assessment

Affected
gphoto libgphoto2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libgphoto2是gPhoto开源的一个数码相机访问与控制库。 libgphoto2 2.5.33及之前版本存在安全漏洞，该漏洞源于camlibs/ptp2/ptp-pack.c文件中ptp_unpack_Sony_DPD函数在PTP_DPFF_Enumeration情况下读取2字节枚举计数时未验证缓冲区剩余字节，可能导致越界读取。

CVSS 5.2 · Medium EPSS 0.20% · P10

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions
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I. Basic Information for CVE-2026-40338

Vulnerability Information
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Vulnerability Title
libgphoto2 has OOB read in ptp_unpack_Sony_DPD() enumeration count parsing in ptp-pack.c
Source: CVE Program / CVE List V5
Vulnerability Description
libgphoto2 is a camera access and control library. Versions up to and including 2.5.33 have an out-of-bounds read in the PTP_DPFF_Enumeration case of `ptp_unpack_Sony_DPD()` in `camlibs/ptp2/ptp-pack.c` (line 856). The function reads a 2-byte enumeration count N via `dtoh16o(data, *poffset)` without verifying that 2 bytes remain in the buffer. The standard `ptp_unpack_DPD()` at line 704 has this exact check, confirming the Sony variant omitted it by oversight. Commit 3b9f9696be76ae51dca983d9dd8ce586a2561845 fixes the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
libgphoto2 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libgphoto2是gPhoto开源的一个数码相机访问与控制库。 libgphoto2 2.5.33及之前版本存在安全漏洞，该漏洞源于camlibs/ptp2/ptp-pack.c文件中ptp_unpack_Sony_DPD函数在PTP_DPFF_Enumeration情况下读取2字节枚举计数时未验证缓冲区剩余字节，可能导致越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
gphoto libgphoto2 <= 2.5.33 -

II. Public POCs for CVE-2026-40338

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III. Intelligence Information for CVE-2026-40338

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Vendor Advisories for CVE-2026-40338 (1)

Same Patch Batch · gphoto · 2026-04-17 · 8 CVEs total

CVE-2026-40340 6.1 MEDIUM libgphoto2 has OOB read in ptp_unpack_OI() in ptp-pack.c via malicious PTP ObjectInfo resp
CVE-2026-40333 6.1 MEDIUM libgphoto2 has OOB read in ptp_unpack_EOS_ImageFormat() and ptp_unpack_EOS_CustomFuncEx()
CVE-2026-40339 5.2 MEDIUM libgphoto2 has OOB read in ptp_unpack_Sony_DPD() FormFlag parsing in ptp-pack.c
CVE-2026-40335 5.2 MEDIUM libgphoto2 has OOB read in ptp_unpack_DPV() UINT128/INT128 handling in ptp-pack.c
CVE-2026-40334 3.5 LOW libgphoto2 missing null termination in ptp_unpack_Canon_FE() filename buffer in ptp-pack.c
CVE-2026-40341 3.5 LOW libgphoto2 has an OOB Read in ptp_unpack_EOS_FocusInfoEx
CVE-2026-40336 2.4 LOW libgphoto2 has memory leak in ptp_unpack_Sony_DPD() secondary enumeration list in ptp-pack

IV. Related Vulnerabilities

Same product: libgphoto2
Same vendor: gphoto
Same weakness: CWE-125

V. Comments for CVE-2026-40338

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